Mined Opinions For API: com.google.code.gson

This tab contains all the opinions collected from Stack Overflow about the API. The other tabs present summaries of the opinions using different algorithms.
  • Post your code that you have tried so far.It will be helpful to give a precise answer accordingly.. details
  • Thanks Erik, I modified the post.. details
  • Please format your question nicely.. details
  • When you say it like that I agree with you.. details
  • if you want to gson on client side then you have to try this library URL_https://github.com/heroandtn3/bGwtGson .. details
  • Thanks but I'm using Java, I think that would not work.. details
  • Dave, Thank you for your reply.. details
  • Using actual version of GSON (2.2.4) it works again.. details
  • Seems like you should call get("boards") to get a JSONArray of JSONObjects, and then iterate through that array to get whatever data you need and put it into whatever data structures you need it in.. details
  • You are free to accept none, if you want.. details
  • I would comment that if you aren't using the automatic serialization elements from gson you may as well be using the smaller jar from json.org.. details
  • GSON is a very powerful library for convert JSON-Java Object and viceversa... details
  • I personally prefer GSON its googles support for JSON check out this thread URL_http://stackoverflow.com/questions/338586/a-better-java-json-library .. details
  • +1 Note: Gson is great for simple cases.. details
  • Not sure, but it seems like you have a list of users, not a single user.. details
  • I have tried that and it works.. details
  • I thied it with a list as well, still does not map anything.. details
  • @Aronnn - In your fromJson call, the type you are assigning to is supposed to be MyElement[].class, not MyElement.class.. details
  • @Reeebuuk: predictions is a JSON array (surrounded by [ ]), so you have to parse it in a List... the number of elements in the array it's not important, there may be 1 object, 9999 or 0, in any case the List predictions will be filled with those elements... Then, each one of those objects (you called it Locations), in turn, has exactly 1 reference element and 1 terms element... the latter is again an array.... details
  • @Programmer Bruce +1 for saying "rather have one simple line of code".. details
  • You would essentially deserialize the json into its respective java objects and then use getters to retrieve the data you want.. details
  • Thank you Eugene!. details
  • GSON is very nicely implemented and it'll even handle hierarchical class structures, so just throw an object at it, and it'll serialise it.. details
  • Usage of GSON is very, very, very simple.. details
  • Good link.. details
  • Ok thanks so just defining this view in xml file will take care of automatic mapping?. details
  • Jackson is a popular alternative to GSON.. details
  • @VigneshGopalakrishnan Yes, in Gson, the names of variables must be same and even the dataType should be correct otherwise it creates problem.. details
  • thanks, simple but great.. details
  • You can test with Gson or Jackson or [Java API for JSON]( URL_http://www.oracle.com/technetwork/articles/java/json-1973242.html ) and find which one is the best for you.. details
  • I can use anything else for the mapping like Gson.. details
  • OK my solution is to send Type as parameter when creating JsonDownloader class, then everything works fine.. details
  • Why don't you use GSON to save all the parsing thing?. details
  • Reopening this since the duplicate wasn't a good match, but note that you did also ask about deserialization, so: URL_http://stackoverflow.com/questions/8211304/using-enums-while-parsing-json - with-gson.. details
  • Would you please post more information, what kind of data it is and what kind of data format you want.. details
  • also Simples class is mentioned above .. details
  • Thanks.. details
  • Also please provide your class AudioDto.. details
  • The above code uses GSON as per its documentation, which is the best you can do.. details
  • So i would not have to write manual parsing for the other values in the array (which the default deserializer parses fine).. details
  • (main and readApp) Thank you :).. details
  • If all the values are constant then you could use just one json values right.. details
  • Many thanks.. details
  • @nurisezgin: I already created Values class and can you answer my question please.. details
  • @Valter: You're welcome!. details
  • Thanks, I was mixing up the info transport notation(JSON) with actual Javascript Objects.. details
  • As I said it is working on some machines (I think only on windows) and not on others.. details
  • You can probably parse the JSON yourself to find the "wantedName" value.. details
  • Thanks @MikO.. details
  • I didn't know about Type Erasure so thanks for pointing me on it.. details
  • I really appreciate you help @MikO, the links that you have provided are very helpful, I prefer fixing the serialization issue of Jersey more than working around with parsing in Gson.. details
  • (addition to above: official numbers were included -- streaming Gson is faster than databinding, but not up to Jackson performance level).. details
  • Thanks for reply.Is the same possible with Gson?. details
  • Thank you, but it's returning null.. details
  • That was perfect.. details
  • Interesting...I'll take a look.. details
  • Could you take a look to my gist please?. details
  • Reopening this since the duplicate wasn't a good match, but note that you did also ask about deserialization, so: URL_http://stackoverflow.com/questions/8211304/using-enums-while-parsing-json - with-gson.. details
  • If it's empty you should check your query, if not would be nice if you could paste the result of resultAdHoc.toString() editing your question.. details
  • Well, it's not buggy, it's working very well for me, I had special characters without problem.. details
  • Is there anyway to download it as a .jar like GSON?. details
  • Thanks !.. details
  • This is what I meant by "I appreciate I could roll my own implementation of this behaviour with streaming JSON APIs from Jackson, GSON etc.". details
  • The simplest solution could be creation of some other class, which would contain some variable (or list of type person) with name "person".. details
  • Well, it's not buggy, it's working very well for me, I had special characters without problem.. details
  • Thanks, I was mixing up the info transport notation(JSON) with actual Javascript Objects.. details
  • Elegant solution.. details
  • It's not incorrect, but it's just another respresentation of the same info, and as I said, it's quite common in REST services to return the data like that, contained in a field "response" or wahtever name.... details
  • But from running this locally, I don't think it supports statements of being super fast.. details
  • Usually libraries like GSON or Jackson (mentioned above) offer some validations in this aspect avoiding mal-formed json input, and usually (I have worked with both) they do quite well on performance; also using a json lib would provide you with other functionality to extend in the future if you need.. details
  • This idea is from the answer to one of my questions, check it out here URL_http://stackoverflow.com/questions/20185625/json-gson-what-is-the-best-way-to - deserialize-to-a-super-class-object-and-then.. details
  • ok, json it is, thnx for your opinion.. details
  • You can use GSON's POJO mapping again internally (using the supplied Reader) once you have determined the correct type.. details
  • Does this line System.out.println("\n\njsonString " + jsonString);** prints any value, if so then please paste that too.. details
  • Use gson library for json parsing.Much Helpfull.. details
  • Good answers.. details
  • If you can figure out a way to do that; getting it back in Python is simple: json_obj eval(json_string) and then use json_obj.type to create the appropriate object.. details
  • Thanks !.. details
  • just added what the JSON would look like after serialisation using Gson in Java.. details
  • Thank you very much Pragmateek!. details
  • Json is a standard like XML and Gson looks like a library that google wrote.. details
  • Please put the code you're running (which throws IllegalStateException).. details
  • Using the CompressedPropertyNamingStrategy (or CompressedFieldNamingStrategy with Gson) is working like charm!. details
  • Not sure, but it seems like you have a list of users, not a single user.. details
  • Found this slightly more complicated than the one that worked for me.But still, nice solution, definitely cleaner than mine.. details
  • GSON is a very powerful library for convert JSON-Java Object and viceversa... details
  • You are free to accept none, if you want.. details
  • seems like jackson needs them and gson doesn't.. details
  • You can parse it however you want, like with Google GSON, etc.. details
  • It's good that Gson works well but the easiest way right now to create new project in Eclipse and do what you did to find real problem.. details
  • Should work fine.. details
  • seems like jackson need them and gson doesn't right, this is a difference in performance.. details
  • Because the Gson message tells the same thing as Jsonlint, it is just not enumeration what a "value" technically is.. details
  • No, I am also planning to use the values in calculations and other stuff.... details
  • I don't know much about gson but when you said that the parsing return null, what was the value of jsonString when you called Gson.fromJson(jsonString, ClassA.class); ?. details
  • StackOverflow is probably a good place for the programming help conversations.. details
  • For a ClassA response it would look like { response: { data: {foo: "Foo!"}. details
  • Thanks for your explanation it saves me a lot of time.. details
  • Have you created those json yourself or was it by gson.toJson(a,ClassA.class) or something like that?. details
  • thank you cool the.. details
  • Just where you're calling that method use the returned value and use above gson code snippet to convert returned list from getCartList() method to JSON string.. details
  • I would be interested in seeing a measurement that backs this up.. details
  • Gson eventGson new Gson(); Type eventsType new TypeToken>(){}.getType(); List eventList eventGson.fromJson(obj.get("events"), eventsType); test.setEvents(eventList);Json input would be something like: {"id":"001","name":"Name","param_distance":"10","param_sampling":"2", "events":[{"id":"01"}, {"id":"02"}]}.. details
  • How does the use of Type apply in that case to deserialize using something like MyCustomClass obj gson.fromJson(json, MyCustomClass.class).. details
  • Can you please provide other examples of the different JSON responses you can get from the server?. details
  • List objList dao.getStatus();DbMetaPojo obj new DbMetaPojo(); if(objList!=null && objList.size()>10000) { for (Object nameObj : objList) { obj.setRecordID(nameObj[0]); obj.setRecordName(nameObj[0]); ; } }is this correct ?. details
  • I am trying to get something like an array list of "news-item" objects, which all contain link title content img and type... details
  • Nice suggestion @jsn but it actually didn't work.. details
  • seems like jackson need them and gson doesn't right, this is a difference in performance.. details
  • Gson json new Gson();Multiplayer result json.fromJson(answer.toString(), Multiplayer.class);If I change it from "Multiplayer" to "gameboard" , it will work just fine (after a change on the servlet to send a "gameboard" type and not a "Multiplayer").. details
  • Thanks.. details
  • I have done this now, but it seems that only the values are in this json String, but not the keys.. details
  • Thanks.. details
  • Ah, if you notice the bottom of my question, this looks like it will break my view handling as it returns the view "main", is it possible to do this JSON response and keep handling my views within the controller?. details
  • Thank you I updated my question.. details
  • That looks interesting.. details
  • but when i send the json string to my server, i got this warning org.json.JSONException: Value. details
  • Well, Gson can already ready from streams directly (aka, you don't need to send the message length in the stream).. details
  • I'm sure you can probably do something similar in jackson, but I'm happy to switch to google gson as none of my client code outside the parser relies on any specific concrete json implementation.. details
  • Thanks Matt Quiros.. details
  • The easiest solution is just making an inner class like the last example in that answer.. details
  • JsonWriter wasn't designed for this kind of extensibility and lacks the necessary hooks.. details
  • I'd add that while the configuration options with Jackson are vast and much more significant than those available with the Gson API, for the simple use case of mapping between data structures requiring minimal custom processing, Jackson, like Gson, provides for a simple one line solution.. details
  • (main and readApp) Thank you :).. details
  • Yep I've been much happier with FlexJSON than GSON in Play too.. details
  • Good to know that you wantto parse, but what data do you want to fetch?. details
  • Should work if the test succeeds: URL_https://code.google.com/p/google-gson/source/browse/tags/gson-2.0/src/main/jav a/com/google/gson/JsonPrimitive.java.. details
  • JsonWriter wasn't designed for this kind of extensibility and lacks the necessary hooks.. details
  • Has Gson support too now :).. details
  • I find jackson or simple json much easier to use then gson.. details
  • @Perception public class Test { private String topic; private List<Person> listOfPersons; } I tried something like gson.fromJson(this.json, Test[].class); but no luck because gson looks for listOfPersons in the json, but it doesn't exists.. details
  • And with Jackson don't help me when I need to parse large files, so for my app GSON was the best, even more slow, can read large files.. details
  • What does the JSON string look like?. details
  • Well, my use case isn't always this simple, just wanted a simple example on here instead of having a 300 line example of nested JSONObjects @Edward Falk.. details
  • Is there a library like Gson that is made for Python?. details
  • from this it looks like it's generating 7 JSON object instead of one single - is there a way to combine the JSON objects together and store in a variable?. details
  • Well first of all your jsonString is not a valid json.. details
  • Please show your serialization and deserialization process as well as a sample gson.. details
  • That JSON sample looks like a Map.. details
  • So what does the call to gson look like ?. details
  • For what it's worth, I don't think you have to use generics even with GSON -- I am pretty sure it, too, would work.. details
  • I'll be glad to look at some code (type of circular dependency more specifically).. details
  • Thank you Philipp!.. details
  • How are you generating that JSON (the method code)?. details
  • This is NOT valid JSON!.. details
  • Thanks but we are not using Gson.. details
  • Could you please specify the libraries you are using to read json in Java.. details
  • I have a pretty big Json feed and I was parsing json with android built-in JSONparser.. details
  • For increasing performance I am working now with GSON now.. details
  • Gson can deserialize fine without a no-args constructor, as OP has stated in his question.. details
  • First get your code working, then if it does not meet your performance requirements, find your bottlenecks and start thinking about optimizations.. details
  • Thanks a lot!. details
  • I've seen some performance metrics on GSON - FlexJSON and Jackson Mapper are also easy to use APIs for converting POJO into JSON, and have better overall speed/performance than GSON.. details
  • I used Gson in a standalone fashion and moved on to Jackson b/c it's the default provider for my JAX-RS implementation.. details
  • I'll try to help you as best as I can.. details
  • Hestitated to try GSon but Jackson is doing great :).. details
  • Sir i updated my code with ur code ..Plz see it ..Thanx.. details
  • I'm looking for this like crazy!. details
  • I'm trying the Gson method, because it seem very useful, but I encurred in that problem: "Could not find class 'com.google.gson.Gson', referenced from my package.Btw, I included the library and it compile, it give that problem only run time.. details
  • it works, thx you.. details
  • You probably don't have any control over the server, but IMHO it was not a good idea for someone to design a protocol using JSON where the order of the keys matter.. details
  • Well I was using ROME for RSS feeds, and the framework I'm using contains gson, Thats why I'm trying to use it, but I'm open to any other library.. details
  • I cannot choose the library I'm working with.. details
  • Thanks for your answer.. details
  • please post it.. details
  • Gson instances are even thread-safe, so you can share one across multiple threads safely!.. details
  • Thanks Matt Quiros.. details
  • Perhaps you could provide an example of the Map structure you'd like to end up with?. details
  • I'll try to help you as best as I can.. details
  • this is what I suggested on my answer, please mark yours or mine as solution.. details
  • i can do but it shouldn't matter cause it works flawlees with gson.. details
  • Lucky you!.. details
  • Can you please repost the relevant sections from your blog here so that in case your blog goes down, your answer is still useful in the future?. details
  • When you say it like that I agree with you.. details
  • downvoted in favor of Gson answer below.. details
  • the easy thing is what I'm doing at the moment and it works just fine.. details
  • Change the return value also to List instead of List.. details
  • For those of us who are also new, a quick note on how you "cleaned up" the white space/newlines would be appreciated.. details
  • @Stax: Jackson is simply extremely performant :) Besides, don't forget that Gson does/can more than only serializing.. details
  • How you have resolved your issue?. details
  • thanks.. details
  • Since caliper also uses Gson, I can in fact use the caliper code for parsing the data all the way into specialized Java classes.. details
  • gson should be properly setting the property values.. details
  • Thanks @RaulRene for your confirmation.. details
  • Well, I was thinking about it too.. details
  • You're welcome.. details
  • This has been discussed here before; recommend searching for related questions.. details
  • I've seen some performance metrics on GSON - FlexJSON and Jackson Mapper are also easy to use APIs for converting POJO into JSON, and have better overall speed/performance than GSON.. details
  • Thanks.. details
  • I personally prefer GSON its googles support for JSON check out this thread URL_http://stackoverflow.com/questions/338586/a-better-java-json-library .. details
  • Inner class is good.. details
  • Thank you Arthur for your kind suggestion but the actual question is what is the best way to build so called generic "shouldSkipClass" method.. details
  • please post Json String (responseElement) that you want to deserialize.. details
  • cheers Miko.. details
  • Thanks @giampaolo finally I add a few line more to store information in ArrayList: //List of objects to persist List firstTranslationList new ArrayList(); List originalTermList new ArrayList(); List list new ArrayList(principalTranslation.values()); for (Item item : list) { firstTranslationList.add(item.FirstTranslation); originalTermList.add(item.OriginalTerm); } Thanks again :).. details
  • Interesting, going to do some tests and look at source...and if it's OK edit a bunch of answers :\ thanks for the clarification.. details
  • This is NOT valid JSON!.. details
  • thanks very much, this is really what I want.. details
  • This works fine but is not exactly what I want (but it's what I've done in the end anyway...).. details
  • Thanks!.. details
  • looks good!. details
  • That' what I need !. details
  • Do you want do deserialize something like {"width":3, "h":4, "d":2} or {"w":3, "h":4, "d":2} indifferently into Box?. details
  • Thanks buddy.. details
  • are you have another tutorial,this is my need, i want to parse the json like this.. details
  • Thanks for that helpful info and tutorial on GSON, RC.. details
  • The power of GSON is not how fast it parses, but how fast it is to write and maintain the code required for a large number of production cases.. details
  • And when you need to optimise, GSON's streaming model does provide great performance increases.. details
  • I'm accepting this one as it outlines the key point that "null fields are not serialized", and upvoting the other as it provided the key intuition.. details
  • Faith in humanity: recovered ).. details
  • Thanks!.. details
  • If you remove them Wrapper[] data gson.fromJson(jElement, Wrapper[].class); works fine for me.. details
  • First get your code working, then if it does not meet your performance requirements, find your bottlenecks and start thinking about optimizations.. details
  • When I print this string and pass to GSON it goes fine but as soon as I pass x it gives me different errors.. details
  • You haven't mapped the type property, is Gson happy with leaving out properties?. details
  • Thanks for the information.. details
  • side note, Class<?> clas_s is sometimes written as Class<?> clazz - anybody know what is the "standard".. details
  • Good solution without a custom deserializer!. details
  • this might help: URL_http://stackoverflow.com/questions/444380/is-there-a -streaming-api-for-json I'd be inclined to try GSON first.. details
  • Thank you :) but why do we have to set jsonReader.beginObject(); and jsonReader.endObject(); in each method ?. details
  • Yech!. details
  • Glad you solved.. details
  • The power of GSON is not how fast it parses, but how fast it is to write and maintain the code required for a large number of production cases.. details
  • Thank you, yes teleservices is not null but teleservices.getTeleService("Teleservice_2") returns null.... details
  • Ok, figured it out.Gson is causing it...using json.toString() instead doesn't add the key.Thanks for the replies.. details
  • Added some new code per your recommendations, However im getting a NullPointerException - Looks like also a Error 401,.. details
  • Thanks.. details
  • Sensible defaults are also worth thinking about.. details
  • I found this article and was disappointed to find that this is one of those deprecated ways of pretty printing.. details
  • Hi there!. details
  • Firebug is showing it GETing the data fine, an example being searching for the term "Twitter" resulted in:.. details
  • And with Jackson don't help me when I need to parse large files, so for my app GSON was the best, even more slow, can read large files.. details
  • } meta: { errors: [] success: 1 }}.. details
  • Is it possible to do this for only the in_wanted value?. details
  • Thank you, but the JSON file will not contain only app1, app2, app3, it will be dynamic, so I will not be able to fix the class attributes... details
  • How to resolve that.. details
  • If you're just going to display the values, then a string works best.. details
  • @Mehdi see edit!.. details
  • @Stax: Jackson is simply extremely performant :) Besides, don't forget that Gson does/can more than only serializing.. details
  • Can someone please assist me here?. details
  • I mean i have to create 10,000 java objects for 1000 json results.I am looking for super fast and memory efficient way to do it as json i get is very huge.. details
  • Your question is not very clear... do you want a list of objects Movie with an attribute name, which contains the value of either "movieName" or "movieTitle"?. details
  • you could try gson as well (but it works for draft3 version).. details
  • Seems like a Map<String, YourClass> would work here.. details
  • Well, my use case isn't always this simple, just wanted a simple example on here instead of having a 300 line example of nested JSONObjects @Edward Falk.. details
  • I don't wan't to serialize the class because after I save it I need to use it in a non-Java application.. details
  • Thnx.. details
  • The funny thing is that -overloadaggressively is one of the recommended options in various Proguard examples for setting up GSON.. details
  • Thanks but I'm using Java, I think that would not work.. details
  • So I think you can accept then answer ... or you prefer I remove the 'RTFM' before ;-).. details
  • Thank you very much!. details
  • So without a clear goal you're not likely to get meaningful answers.. details
  • Excellent.. details
  • You need to use a JSON library like GSON , Jackson .. details
  • Thank you very much!. details
  • Added some new code per your recommendations, However im getting a NullPointerException - Looks like also a Error 401,.. details
  • Be clear that JSON is not Gson.. details
  • And if, let's say, "movieName" has a value, "movieTitle" will be always emtpty?. details
  • So how about u convert it to a map and then get the values() from that map?. details
  • For a solution with Gson, see here: URL_http://stackoverflow.com/questions/15658124/finding-deeply-nested-key-value - in-json.. details
  • Gson handles this sort of thing fine.. details
  • And when you need to optimise, GSON's streaming model does provide great performance increases.. details
  • Looks like a duplicate of [this question]( URL_http://stackoverflow.com/questions/6696082/set-date-format-in-gson - in-jsp).. details
  • Thanks.. details
  • @BlazeTama, done again!.. details
  • Thanks, but how can I access MediaUrl?. details
  • That's a good idea too.. details
  • I saw type tokens, and it seems like what I want, but I don't see how you can do it with this case because the list is inside another object, so if I unmarshall that outer object with the type token for the list it won't work.. details
  • You're welcome.. details
  • This works fine in XStream but GSON seems to have issues (see above I edited my post).. details
  • GSON is a good library, we have been using it in our project from past 2years, and it works fine.. details
  • Well the thing is, I'm not trying to convert the string into java object.. details
  • I guess this tag may be valid for some libraries but not for others, or is it something pretty standard?. details
  • Have you thought about using a json lib like [GSon]( URL_https://code.google.com/p/google-gson/) ?. details
  • @BrianRoach, please take a look at URL_https://sites.google.com/site/gson/gson - user-guide#TOC-Nested-Classes-including-Inner-Classes- I'm referring to that part of documentation.. details
  • Have you thought about using a json lib like [GSon]( URL_https://code.google.com/p/google-gson/) ?. details
  • Good point.. details
  • thanks, simple but great.. details
  • Yes good idea thank you very much I really appreciate your help, very kind of you.. details
  • @SB there is no standard.. details
  • (addition to above: official numbers were included -- streaming Gson is faster than databinding, but not up to Jackson performance level).. details
  • Sure, if you use JSON your project earns interoperability.. details
  • Thanks, I think I'll give JSON a try, just because is a good option if someday I want to change the language of the project sending the data.. details
  • And it's easy to deserialize {"num":1} to Integer if I have a class with Integer field "num", but when gson deserializes json to Map it desides to use Double.. details
  • Hi, thanks for the rapido response!. details
  • @AmitSharad Doesn't seem so, you are looping over the entire object list and assigning [0]th index value to DbMetaPojo every time.. details
  • Well, my use case isn't always this simple, just wanted a simple example on here instead of having a 300 line example of nested JSONObjects @Edward Falk.. details
  • If one existed I'd prefer a HTTP framework that worked with Gson instead of Jersey as I'm more comfortable with it.. details
  • IMHO I've found Gson to be very easy to use.. details
  • You would essentially deserialize the json into its respective java objects and then use getters to retrieve the data you want.. details
  • Good answers trump "not constructive" questions.. details
  • errr... somebody upvote this back up.. details
  • I find jackson or simple json much easier to use then gson.. details
  • Usually libraries like GSON or Jackson (mentioned above) offer some validations in this aspect avoiding mal-formed json input, and usually (I have worked with both) they do quite well on performance; also using a json lib would provide you with other functionality to extend in the future if you need.. details
  • FWIW, almost all Java JSON libraries support this conversion mode, including GSON, Jackson and Genson.. details
  • Now everything works fine even with non-static inner class.. details
  • I have done this now, but it seems that only the values are in this json String, but not the keys.. details
  • Thanks for reply.. details
  • The deserializer saved me a lot of further research time... thanks!.. details
  • I haven't used GSON , it looks like it is a useful library , if that doesn't work you can always switch back to extracting by hand and mapping to the required Class.. details
  • Ah, if you notice the bottom of my question, this looks like it will break my view handling as it returns the view "main", is it possible to do this JSON response and keep handling my views within the controller?. details
  • Thanks mykhaylo ,I will use your provided solution,one question that im not sure that I fully understand is why do i need to provide "entry1List" and 2 also in the code mapping.put("entryList1", "customer"); in my code I can have 1..n entry list not just one or two... mapping.put("entryList2", "Address");.. details
  • Thanks for the help randiel!. details
  • If you're just going to display the values, then a string works best.. details
  • Google provides [a good json encoding/decoding library]( URL_http://code.google.com/p/google-gson/) .. details
  • Usage of GSON is very, very, very simple.. details
  • @mabuzer Gave up...just using Gson (for pretty-print) + json-simple for everything else.. details
  • Also please either add a link to the answer you use, or post the complete code for the Serializer instance.. details
  • Should work if the test succeeds: URL_https://code.google.com/p/google-gson/source/browse/tags/gson-2.0/src/main/jav a/com/google/gson/JsonPrimitive.java.. details
  • Yes, given the "soft leniency mode" of gson parser we decided (for now) to complement with jackson parser to satisfy all of our requirements.. details
  • Thanks!. details
  • I mean i have to create 10,000 java objects for 1000 json results.I am looking for super fast and memory efficient way to do it as json i get is very huge.. details
  • This idea is from the answer to one of my questions, check it out here URL_http://stackoverflow.com/questions/20185625/json-gson-what-is-the-best-way-to - deserialize-to-a-super-class-object-and-then.. details
  • If you insist on generating it then you can do so using a [JSONWriter]( URL_http://google-gson.googlecode.com/svn/trunk/g son/docs/javadocs/com/google/gson/stream/JsonWriter.html), though to be honest I don't know why you would want to generate syntactically incorrect data.. details
  • Why not use serialization libraries like GSON which does all this for you?. details
  • This question addresses pretty the same problem as URL_http://stackoverflow.com/questions/4623329/gson-serialize-pojo-with-root - value-includedand the accepted answer is also pretty the same.. details
  • For example if the widget_id comes back without quotes, which is perfectly valid JSON, a simple regex will fail whereas the parser will be fine with it.. details
  • Sure, if you use JSON your project earns interoperability.. details
  • Google's Protocol Buffer looks interesting, but doesn't have a proper implementation with Java annotations.. details
  • This for dynamic creation of GSON does not work as intended.. details
  • Thanks, I think I'll give JSON a try, just because is a good option if someday I want to change the language of the project sending the data.. details
  • This works perfectly fine for me.. details
  • Thank you, yes teleservices is not null but teleservices.getTeleService("Teleservice_2") returns null.... details
  • Thanks man.... Its Working.. details
  • Can you please provide an example on how this can be done using gson please?. details
  • Please, provide better explanation what you have and what you need to do with classes which you have.. details
  • Please include your code.. details
  • ok, good to know.. details
  • @MikO : Thank you, I did as you said, I changed the whole project and created classes but I get a nullPointerException, can you please check my new question : URL_http://stackoverflow.com/questions/16416965/nullpointerexception-json - parsing-in-java-using-gsonThnk you :).. details
  • I have been trying something like that, although, I was using ArrayList instead of List.. details
  • I've got lots of "examples" in some code I was playing around with at one point.. details
  • Thank You Hank for answer.. details
  • Well, my use case isn't always this simple, just wanted a simple example on here instead of having a 300 line example of nested JSONObjects @Edward Falk.. details
  • I'm looking for this like crazy!. details
  • @MikO : Thank you, I did as you said, I changed the whole project and created classes but I get a nullPointerException, can you please check my new question : URL_http://stackoverflow.com/questions/16416965/nullpointerexception-json - parsing-in-java-using-gsonThnk you :).. details
  • thank you very much.. details
  • Dave, Thank you for your reply.. details
  • Thanks for your answer, i think i got it.. details
  • This works perfectly fine for me.. details
  • Yes good idea thank you very much I really appreciate your help, very kind of you.. details
  • thanks.. details
  • True, Gson 2.1 is not slow, earlier versions had significant performance issues but fortunately those have been addressed.. details
  • Thank you, but it's returning null.. details
  • thanks, good solution.. details
  • But if you limit what's acceptable to just .isJsonObject() (method of JsonElement) then it works well.. details
  • Thanks for your answer.. details
  • Thanks for catching that Aurand.. details
  • Is it safety when you didn't close inputStream?. details
  • This is NOT valid JSON!.. details
  • nice explanation +1 for this.. details
  • Thanks very much for posting an answer!.. details
  • Good point, thanks.. details
  • Good link.. details
  • Kind of surprising that Gson doesn't seem to have a notation like @SerializedName("Name/object1") or @SerializedName("Name.object1") for getting values from child objects directly.. details
  • That worked like a charm.Thank you!. details
  • Because if you don't have many and very different possibilities, there's something you can do easy.... details
  • Thanks for the explanation.. details
  • Thanks for your explanation it saves me a lot of time.. details
  • I have done with GSON and it works well.. details
  • You are right but that's the way gson works.. details
  • Thanks for the information.. details
  • I just check GSON should be fine with that.... details
  • It's true that Gson injects fields directly, but you do not to switch to other parser to solve this.. details
  • I found this article and was disappointed to find that this is one of those deprecated ways of pretty printing.. details
  • GOOD Explanation +1.. details
  • Thanks for this example.. details
  • @Sam, That's useful information.. details
  • Correct.. details
  • Still can't get GSON to de-serialize correctly.. details
  • I had to just use new Gson().fromJson(json, WidgetList.class) and that worked fine.. details
  • This is NOT valid JSON!.. details
  • Sir, it's perfectly working?. details
  • With latest Gson (2.2.4) it works fine.. details
  • For increasing performance I am working now with GSON now.. details
  • No, I am also planning to use the values in calculations and other stuff.... details
  • Thanks however i am trying to use GSON library to parse json.. details
  • in javascript, since objects are typeless, these type of codes work good.. details
  • That worked like a charm.Thank you!. details
  • And yes, I realize the question was asked 4 years ago, but my answer is for the interested parties needing to do this at the present :) Hope it helps someone!.. details
  • He want this to be done using Gson!.. details
  • If you like I can send something over I have a few snipplets here and there.. details
  • OOP is wonderful, but always good to avoid reinventing the wheel, focus on making apps better.. details
  • If both servers have a jar containing your classes is quite simple to do.. details
  • Just a proposal ... :) p.s.. details
  • Just a proposal ... :) p.s.. details
  • A post by Jason about json, talking about jackson and then resolved with some code from Gson.. details
  • A great answer to this question was provided here - URL_http://stackoverflow.com/questions/13459718/could-not-serialize-object- cause-of-hibernateproxy [Could-not-serialize-object-cause-of-HibernateProxy] The recommended way is to use a TypeAdapter without manually unproxying every object.Then you would register the TypeAdapter with Gson.. details
  • Just output Object Literals!.. details
  • EDIT: To align to your code, you might want to do something like: CODESNIPPET_JAVA5 .. details
  • Use something like [this json validator]( URL_http://jsonlint.com /) to validate your json.. details
  • It looks fine.. details
  • And try to pass result like this CODESNIPPET_JAVA3 .. details
  • My JSON looks like : CODESNIPPET_JAVA1 .. details
  • It's less verbose, easier to read, and most notably, easy to parse with Gson: CODESNIPPET_JAVA2 .. details
  • If it's possible, the best thing for you to do would be to refactor your JSON.. details
  • Best to read up on the URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Writing-a-Deserializer [Gson-User-Guide] to learn how.. details
  • Hi Alexey,thanks for your comment.. details
  • With Gson, that would look something like this CODESNIPPET_JAVA1 .. details
  • These don't really make good use of the full deserialization that can be done, but you could use them to parse out an element of a json array, and pass that item to a typical JSON object mapper, (like Jackson, GSON, etc).. details
  • I appreciate I could roll my own implementation of this behaviour with streaming JSON APIs from Jackson, GSON etc.. details
  • I'm working on a map builder application.It have bus, train, stations, and lines between stations.All those data are stored in a class called 'Map'.. details
  • You are right... you are both right!. details
  • Thanks.. details
  • By default B object (as a part of A) becomes not null, but empty (all fields are null) which is understandable, cause parser doesn't find any field "b" in it (when it is actually a class name).. details
  • I need to be able to parse such strings into A objects correctly.. details
  • By default B object (as a part of A) becomes not null, but empty (all fields are null) which is understandable, cause parser doesn't find any field "b" in it (when it is actually a class name).. details
  • It has the fastest json parsing capability comparing with Gson or other else.. details
  • @M-T-A thanks for the edit.. details
  • for my situation better was: "phones":["5556739386","5555301828"].. details
  • 3 Same as 2), you have it as a Java variable, but you'd like to obtain it by Ajax in JSP.. details
  • Then I suggest to use a JSON parser to get a List out of it, like Google Gson: CODESNIPPET_JAVA3 .. details
  • Let the servlet put it in the request scope and forward to JSP for display like so: CODESNIPPET_JAVA5 .. details
  • Thanks for reading.. details
  • If you're not tied with Jackson, you can use the handy google-gson library as an alternative.. details
  • If you're not tied with Jackson, you can use the handy google-gson library as an alternative.. details
  • Have you tried to print the characters to a file encoded in some Unicode scheme, like UTF-8?. details
  • I wrote this simple class that shows you how use some Gson classes to get what you need.. details
  • JSON has a recursive nature, so the only way to approach to this kind of problem is to write a recursive method.. details
  • JSON has a recursive nature, so the only way to approach to this kind of problem is to write a recursive method.. details
  • I've used both GSON and Jackson and agree that they are easy to use and efficient.. details
  • I've used both GSON and Jackson and agree that they are easy to use and efficient.. details
  • Simple example: Define the class(s) you want to map the json data to: CODESNIPPET_JAVA3 .. details
  • Simple example: Define the class(s) you want to map the json data to: CODESNIPPET_JAVA3 .. details
  • Using Gson would definitely make the code more readable, here's how your above example will look: CODESNIPPET_JAVA1 .. details
  • Another library which is recommended by a lot of people is Gson, but I'm not sure if it would work in my case, since in some cases I would just want to save an array of different map tiles (like doors, walls, floor which all have different properties) or items and etc., not an object.I hesitate to use another library, since I would have to rewrite some existing code and JSONLib has some dependencies, which I don't really want in my program.. details
  • An object of a simple class like CODESNIPPET_JAVA6 .. details
  • It should be clear with the above what you need to do.. details
  • The java class CODETERM8 is a special class that maps nicely to JSON.. details
  • With the example you've given, it looks to me like you misunderstand how Gson works.. details
  • The key is used as the name of the JSON object and the value is used as the value of the JSON object, be it a number, String, JSON array, or another JSON object.. details
  • Because the key is the CODETERM10 CODETERM11 and the value is another JSON object which is serialized as I showed above.. details
  • So my question is, how can i do that?If user want to save 100+ data do i have to make 100+classes or elements?. details
  • maps nicely to the following JSON object CODESNIPPET_JAVA7 .. details
  • Please clarify what you mean.. details
  • Ok i am creating an application that used CODETERM1 to save date.. details
  • But if user want to save 100+ data do i have to make 100 classes?. details
  • but i want the result like this CODESNIPPET_JAVA8 .. details
  • So my question is, how can i do that?If user want to save 100+ data do i have to make 100+classes or elements?. details
  • So, after user saved Data1, they want to save Data2, Data3, etc like this CODESNIPPET_JAVA2 .. details
  • ok now i change the value(mean that i want to add new data CODESNIPPET_JAVA6 .. details
  • It compares Boon, Jackson, Smart JSON and GSON.. details
  • :)GSON is better than most at I/O, but Boon does best all around (and best at I/O), and it has an index overlay mode that is even faster (look at the second set.. the index overlay puts Boon way over the top).. details
  • It compares Boon, Jackson, Smart JSON and GSON.. details
  • I love Gson, it's very simple and easy to use.. details
  • Example below: String nestedJSON "{"id":"1","message":"web_didload","content":{"success":1}} Gson gson new Gson(); LinkedTreeMap result gson.fromJson(nestedJSON , LinkedTreeMap.class); .. details
  • I have no idea what Gson is, but I imagine something like this would work... CODESNIPPET_JAVA1 .. details
  • I have a POJO like this CODESNIPPET_JAVA1 .. details
  • I want to wrap it inside another json object, like this: CODESNIPPET_JAVA1 .. details
  • Note that the added json should _not_ be escaped, but a be part of the wrapper as a valid json entity, like this: CODESNIPPET_JAVA3 .. details
  • Basically your CODETERM4 doesn't follow the URL_http:// URL_www.oracle.com/technetwork/java/javase/documentation/spec-136004.html [Java- Bean-Conventions] that JSON (and GSON by proxy) relies on.So it didn't print anything because you had no getter method for CODETERM5 or CODETERM6 , you have CODETERM7 and CODETERM8 I'm pretty sure you EntryListContainer class needs to look like this: CODESNIPPET_JAVA1 .. details
  • My favorite has always been GSON and has served me well in my Android projects.. details
  • Nice example of what JsonWriter can do, that's for sure.. details
  • I am using google's GSON parsing library and I'm not sure if this has been asked before (I did check what I could find) but, here I go!!. details
  • The types (as can be seen in the classes) are CODETERM2 , so it should be fine.. details
  • "visualization" is a string with a correct JSON format.. details
  • Thank you very much!.. details
  • This seems like a non-issue if I understand you correctly?. details
  • Enjoy :) .. details
  • the reuslt will be a String in your json Object like {id:"32A44C"}.. details
  • CODETERM4 and CODETERM5 have the same structure, maybe you can save a declaration, Gson does not care about name of classes, it looks at structure of it.. details
  • I want to do something like this posted URL_http://stackoverflow.com/questions/15452172/gson-parsing-nested-json- objects?answertab=votes#tab-top [here] , but using this JSON response: CODESNIPPET_JAVA1 .. details
  • But it does not work fully, I can get only this fields correctly: CODESNIPPET_JAVA3 .. details
  • I want to do something like this posted URL_http://stackoverflow.com/questions/15452172/gson-parsing-nested-json- objects?answertab=votes#tab-top [here] , but using this JSON response: CODESNIPPET_JAVA1 .. details
  • A CODETERM3 is kind of a _hack_ to get the generic type so that Gson knows what to use.. details
  • This is Simples Bean class containing a Map CODESNIPPET_JAVA3 .. details
  • Thanks very much !. details
  • Someone please guide me a way through.. details
  • Here is my Json Data on hitting the URL from the Android app i am working on EDIT CODESNIPPET_JAVA1 .. details
  • I've not tried with complex and low level with Map, you can go with doc CODETERM1 URL_https://github.com/heroandtn3/bGwtGson [bGwtGson] library .. details
  • Not through GSON though, but I think you need a base on how JSON works before getting involved in GSON (it's rather complicated) .. details
  • Thank you for advance.. details
  • I tried following these information but I can't solve it: URL_http://albertattard.blogspot.com.es/2009/06/practical-example-of-gson.html [ URL_http://albertattard.blogspot.com.es/2009/06/practical-example-of-gson.html ] URL_http://stackoverflow.com/questions/5490789/json-parsing-using-gson-for- java [JSON-parsing-using-Gson-for-java] I tried to serialized using GSON using POJO but I can't find the right structure, I tried using JsonObject too, jumping through object keys like "term0","PrincipalTranslations" but I have some trouble when I've multiple results for the same key, for example: CODESNIPPET_JAVA2 .. details
  • I tried following these information but I can't solve it: URL_http://albertattard.blogspot.com.es/2009/06/practical-example-of-gson.html [ URL_http://albertattard.blogspot.com.es/2009/06/practical-example-of-gson.html ] URL_http://stackoverflow.com/questions/5490789/json-parsing-using-gson-for- java [JSON-parsing-using-Gson-for-java] I tried to serialized using GSON using POJO but I can't find the right structure, I tried using JsonObject too, jumping through object keys like "term0","PrincipalTranslations" but I have some trouble when I've multiple results for the same key, for example: CODESNIPPET_JAVA2 .. details
  • Deserialize recursive polymorphic class in GSON.. details
  • One of the best example available on web for Gson parsing.. details
  • Thanks a lot :) it worked.. details
  • Thanks a lot :) it worked.. details
  • Gson will use the CODETERM1 to deserialize your enum, since, if I understood correctly the internals of Gson, this type adapter will be called before than the reflective one, which uses instead your serializer stuff.. details
  • I'm trying to serialize my objects back to JSON using Google's Gson using JsonSerializer interface and while deserialization works just fine, serialization doesn't call serialize method.. details
  • While the fromJson() returns correct objects, toJSON() uses default toString() from objects instead of the methods specified in serialize() method.. details
  • Thanks for any suggestions.. details
  • You need to declare your Java POJO that represents your JSON data, like: CODESNIPPET_JAVA1 .. details
  • Hope this help.. details
  • You need to declare your Java POJO that represents your JSON data, like: CODESNIPPET_JAVA1 .. details
  • Good luck.. details
  • Good luck.. details
  • Hope this help.. details
  • Gson is a good library to de/serialize java objects to and from Json.. details
  • finally with Google Gson parse your object as like below CODESNIPPET_JAVA4 .. details
  • Thanks for everyone to help me.. details
  • Is any possible that i Write a class like that.. details
  • Thanks for everyone to help me.. details
  • Best result is if I can extract List from the parsed object.. details
  • I would like to quick and simple to parse it.. details
  • I receive JSON like this CODESNIPPET_JAVA1 .. details
  • This should be pretty simple, but I can't figure out how to solve it.. details
  • I think the best way is to put it into a CODETERM1 , but I can't create a CODETERM2 for it.. details
  • Like: CODESNIPPET_JAVA2 .. details
  • Thanks for any help!. details
  • I have been looking around the internet to try and find the best Java to Json library.. details
  • The two libraries I am interested in are: Jackson Gson I am leaning towards using Gson, but would love some _up-to-date_ help in comparing the two since both libraries are constantly being updated.. details
  • Or URL_http://code.google.com/p/google-gson/ [GSON] Super easy (no getters/settres, no annotations or configurations needed).. details
  • Or URL_http://code.google.com/p/google-gson/ [GSON] Super easy (no getters/settres, no annotations or configurations needed).. details
  • Yes, i've missed TypeTokens in my code, after fixes all works perfectly.. details
  • Thanks.. details
  • To do something like that, you can use CODETERM2 class that returns you a browsable tree of objects and then fire a standard Gson deserialization.. details
  • Three final notes 1. the method instantiates Gson every time, is not efficient, but here I want to show you the concept, you can easily improve this.. details
  • CODETERM5 method is something like a factory pattern, in this pattern you cannot know what kind of object will be returned.. details
  • So CODETERM6 is the return type, you need an CODETERM7 + cast to manage it correctly.. details
  • Hope this can be of some help.. details
  • Thanks for helping me !. details
  • I have a JSON file like this: CODESNIPPET_JAVA1 .. details
  • That's all what i currently have, i hope it helps.. details
  • I'll write here every possible file i've changed while trying to solve this, with the hope it will help someone to help me.At the moment i don't really care how will it work as long as it will work, i do understand whoever that i should probably get this working with either Jackson or Gson.. details
  • Thank you so very much .. details
  • I'd like to generate a JSON doc with a header/body structure, something like: CODESNIPPET_JAVA1 .. details
  • Thanks!. details
  • Currently I'm just writing out the structure myself like this: CODESNIPPET_JAVA2 .. details
  • In code terms, change like this: CODESNIPPET_JAVA3 .. details
  • BTW: it is my first question on SO, so please excuse me if it is not presented as it should be.. details
  • This is all working fine.. details
  • This is all working fine.. details
  • As to Gson vs Jackson: just note that code you gave is different from original one -- you are using POJOs (which makes sense!. details
  • Also, links to performance test would be great -- the only commonly cited one ( URL_http://www.martinadamek.com/2011/02/04/json-parsers-performance-on-android - with-warmup-and-multiple-iterations/) does not show Gson as faster.. details
  • Also, links to performance test would be great -- the only commonly cited one ( URL_http://www.martinadamek.com/2011/02/04/json-parsers-performance-on-android - with-warmup-and-multiple-iterations/) does not show Gson as faster.. details
  • Could someone give me a way to go in this conversion, please?Thank you.. details
  • GSON reference: URL_https://sites.google.com/site/gson/gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] Good Luck!. details
  • Gson is the easiest to use.. details
  • I should've created a class and send it instead of a simple string.. details
  • I understand, thank you.. details
  • It returns simple-formatted page with the value of String messageToApplet, nothing more.. details
  • CODETERM2 Well, you get the idea...I just need to extract the key value for "first_aired_iso" for each episode.. details
  • Here is the URL which calls the API CODETERM1 And here is the corresponding JSON response !. details
  • Other than that ... it deserializes fine on my machine.. details
  • Your code works perfectly fine with one small problem: you seem to have created a GsonBuilder named builder but are then using one named gsonBuilder.. details
  • GSON Json would be fine for me, but i'm curious why its not working in the current configuration.. details
  • Of course, you could use alternative way to serialize/deserialize your enum like asked URL_http://stackoverflow.com/q/19715374/1360888 [here] .. details
  • Of course, you could use alternative way to serialize/deserialize your enum like asked URL_http://stackoverflow.com/q/19715374/1360888 [here] .. details
  • This class reduce the serialization of enum to printout the name of the enum value and the deserialization to get the enum value from its name.. details
  • The answer is simple, default behavior for Gson is to use the CODETERM1 .. details
  • To deserialize from the Json you produce with the custom serializer, you need also a custom deserializer that maps code (in this case) to your enum value.. details
  • Edit**If you want to write a deserializer for this case, you need to change CODETERM2 like this: CODESNIPPET_JAVA4 .. details
  • (you can skip if you want)** You asked also why you serialize the name of the enum value instead of its "properties".. details
  • and then the deserializer is very simple.. details
  • It works for standard Java object serialization but also [Gson respects it]( URL_https://sites.google.com/site/gson /gson-user-guide#TOC-Java-Modifier-Exclusion).. details
  • I wrote a quite detailed URL_http://stackoverflow.com/questions/19588020/gson- serialize-a-list-of-polymorphic-objects/19600090#19600090 [answer] that has same concepts.. details
  • You are using CODETERM2 and CODETERM3 that I consider "low level" respect to the services that Gson provides to you.. details
  • I declared it as static so you won't slow serialization/deserialization with multiple allocation of Gson.. details
  • To go faster, I use a map to associate the CODETERM2 string to the corresponding class.. details
  • How can I make this work elegantly?. details
  • Here's what my inherited class (ObixOp) looks like: CODESNIPPET_JAVA3 . }. details
  • Here's the result: {"obix":"obj","is":"obix:Lobby","children":[{"obix":"op","name":"batch"}]} The serialization mostly works, except its missing the contents of inherited members (In particular obix:BatchIn and obixBatchout strings are missing): Here's my base class: CODESNIPPET_JAVA2 .. details
  • Care to tell _why_ you want to escape them at all?. details
  • From SO and few other places, I have found that I need to define a top level container like one below but I do not know how to complete its definition CODESNIPPET_JAVA2 .. details
  • I could not find a way to do something this simple using Gson.. details
  • For creating json in servlet you can use any library like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm [java-json] .. details
  • For creating json in servlet you can use any library like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm [java-json] .. details
  • In second case, blob will be deserialized as a LinkedTreeMap, so you can access its elements using CODETERM2 for example; Let me know if it's enough or if you are interested also in the type adapter solution.. details
  • Before serializing this object with GSON, CODETERM5 works fine.. details
  • I've been always using Gson to parse my json objects, but how can i parse this kind of file ?. details
  • I'm not sure if it's the best approach, but it's pretty straightforward.... details
  • Specifically, in this case, it's because my web front end can be used to update the password and send it to the Java side,, but I never want to send the password back to the front end (for obvious security reasons).. details
  • Specifically, in this case, it's because my web front end can be used to update the password and send it to the Java side,, but I never want to send the password back to the front end (for obvious security reasons).. details
  • @PrathameshTalathi : most welcome friend :) if this answer help you in solving your issue then you can mark it as answer.Thanks.. details
  • Thanks i got solution with Gson also.. details
  • Since you have not a default constructor, best approach with Gson is a custom deserializer.. details
  • And this is my execution: Container [polygon=[GeoPoint [x=23.5980319, y=37.9554494], GeoPoint [x=23.5967015, y=37.9557201]]] .. details
  • then you need a deserializer (this won't work with CODETERM8 since it uses int, but you can fit it to your needs in case) CODESNIPPET_JAVA3 .. details
  • What I am doing is something like CODESNIPPET_JAVA1 .. details
  • Can someone please shed some light?. details
  • I am currently using a code (best answer on a question) I found URL_http://stackoverflow.com/questions/2221413/how-to-encode-a-mapstring- string-as-base64-string [here] everything works properly until you give it a japanese CODETERM1 input.. details
  • Thank you.. details
  • I have tried looking at GSON, but I can't understand it If anyone had any help, it would be great, thanks .. details
  • I have tried looking at GSON, but I can't understand it If anyone had any help, it would be great, thanks .. details
  • Maybe because isn't a full pojo, Gson isn't casting rightly.. details
  • But anyways, give it a try!.. details
  • I'm pretty sure that if you don't annotate a field with the CODETERM3 annotation, Gson ignores it by default.. details
  • Good luck!. details
  • Also tried setting it to transient or removing to see if GSON wouldn't bother parsing but still I get: CODESNIPPET_JAVA2 .. details
  • Thanks .. details
  • If you could alter this for gson then it'll be good for your requirement.. details
  • Here is the code I have to display the full list, but I do not fully understand it and so far can't manipulate it to my advantage; CODESNIPPET_JAVA2 .. details
  • Cheers .. details
  • This should be rather useful if you want to see a working example of deserializing a json message with the help of GSON api.. details
  • This should be rather useful.It is an example of GSON api used for deserializing a json response.. details
  • before setting value to object variable you want to convert ti json apply above method to encode string.. details
  • For more information, please look into URL_https://code.google.com/p/google- gson/ [ URL_https://code.google.com/p/google-gson/ ] .. details
  • GSON: Cannot correctly parse JSON object.. details
  • What I expect (I am new to GSON) is that it produces the value of CODETERM2 as a CODETERM3 object.. details
  • I am trying to parse a JSON object like the following with GSON: CODESNIPPET_JAVA1 .. details
  • I use jsonparser, but thanks.. details
  • I use jsonparser, but thanks.. details
  • GSON, which you're using, supports serializing Java objects into JSON objects.. details
  • I have a several classes that contain recursive depending on each other and I serialize them to JSON format with Gson GraphAdapterBuilder, and its work perfect.. details
  • You just need to add braces like this code: CODESNIPPET_JAVA3 .. details
  • I read more than 20 answers, but unable to find how to deserialize such a structure, please help on what would the class look like since the hour is not a fixed string.. details
  • The json looks like this : CODESNIPPET_JAVA1 .. details
  • my structure has to be right because in Gson I only need two lines and it works perfectly.. details
  • The reason why Gson acts like this is explained better URL_http://stackoverflow.com/a/6203975/1360888 [here] .. details
  • A comparison between Jackson and Gson features can be found URL_http://programmerbruce.blogspot.it/2011/06/gson-v-jackson.html [here] , you may be interested in setter/getter part.. details
  • The POJO class looks something like this: CODESNIPPET_JAVA1 .. details
  • The link I've posted with the user guides gives you all this, and explains much more of this powerfull library.. details
  • The link I've posted with the user guides gives you all this, and explains much more of this powerfull library.. details
  • Thanks for the code samples.. details
  • They highlight some elegant options very well.. details
  • Thanks for the code samples.. details
  • They highlight some elegant options very well.. details
  • Please help me to sort-out this issue.my bean class correctly created with getters and setters .. details
  • You could just setup a POJO heirarchy that matches your CODETERM1 as seen URL_http://stackoverflow.com/questions/19154851/how-can-i-deserialize-array- inside-of-array-google-gson [here] (Preferred method).. details
  • plz refer updated post and my implementation something like this URL_http://stackoverflow.com/questions/13873887/issue-with-parse-json - to-java-object-using-gson.. details
  • plz refer updated post and my implementation something like this URL_http://stackoverflow.com/questions/13873887/issue-with-parse-json - to-java-object-using-gson.. details
  • Glad I could help :).. details
  • since learnt from implementing backbone and gson that it is not that smart to do so.. details
  • And sometimes return like this CODESNIPPET_JAVA2 .. details
  • how to use gson handle dynamic response data?. details
  • We actually did some performance tests and found jackson considerably faster than gson.. details
  • If I had to compare I would say Gson is faster and easier to use than Jackson.. details
  • A difference is that Jackson uses getters/setters by default, whilst Gson works with reflection.. details
  • If I had to compare I would say Gson is faster and easier to use than Jackson.. details
  • I've never played with it, but would be interested to see the library size and performance comparison to gson, jackson, and native android json handling code.. details
  • I've never played with it, but would be interested to see the library size and performance comparison to gson, jackson, and native android json handling code.. details
  • [Gson]( URL_http://code.google.com/p/google-gson /) works great on Android.. details
  • [Gson]( URL_http://code.google.com/p/google-gson /) works great on Android.. details
  • If I manually specify CODETERM3 it takes into account that items in "items" field are objects of type AudioType but with parameterized type it seem like it is casting it to Object class.. details
  • Now in Java I attempt to parse it into a Java Object like so: CODESNIPPET_JAVA3 .. details
  • How to get variable's value from Gson.. details
  • First, im a begiiner in GSON so please bear with me.. details
  • When i debug the code, i can see the CODETERM1 class value is successfully retrieved inside the CODETERM2 .. details
  • I successfully retrieve the JSON data with this code : CODESNIPPET_JAVA2 .. details
  • GSON is indeed a very popular library, but for example, Jackson has a large installed base due to its inclusion as default JSON library in both RESTEasy and Jersey.. details
  • GSON is indeed a very popular library, but for example, Jackson has a large installed base due to its inclusion as default JSON library in both RESTEasy and Jersey.. details
  • @Perception well it's the goto library in my book.. details
  • GSON is definitely not the defacto standard for JSON processing in Java.. details
  • I was missing the main json object at the begning the class to parse this json string using gson lib should be like this CODESNIPPET_JAVA1 . }. details
  • : If your class has a default constructor (even an empty one), _your first pattern (initializing the instances variables where they are defined instead of in the constructor) should work fine._ If your class does not have a default constructor, I believe (I could be wrong) that Gson manually tries to allocate the object, which would skip any initialization at all.. details
  • FWIW, this may be relevant URL_https://groups.google.com/forum/#!topic/google- gson/vcKvgUDxuUk [Default-Value-when-deserialized?]. details
  • With this result (I have added standard CODETERM1 methods): CODESNIPPET_JAVA2 .. details
  • Since you are asking about a JSON file, ie a text file that contains a JSON string, please make reference to URL_http://stackoverflow.com/questions/326390 /how-to-create-a-java-string-from-the-contents-of-a-file [How-to-create-a -Java-String-from-the-contents-of-a-file] question for loading a file into a string.. details
  • To Convert json to java objects i created a class like this CODESNIPPET_JAVA2 . }. details
  • My json is like this CODESNIPPET_JAVA1 .. details
  • Please help.. details
  • Buy the way, you may want to make your code clearer, like this: CODESNIPPET_JAVA1 .. details
  • but thank you for your answer and insight.. details
  • but thank you for your answer and insight.. details
  • I have used gson before successfully, but never with an array like this.. details
  • I just want the name of the car and code of the truck from the output, when i parse i get the car name with quotes as output, I remove the quotes with string replace, am I parsing the values correctly?. details
  • thanks, but, on the second request ( URL_http://en.wikipedia.org/w/api.php?format=j son&action=parse&page=Valencia_Cathedral&prop=textion=1) there is a field which name is "*".. details
  • thanks, but, on the second request ( URL_http://en.wikipedia.org/w/api.php?format=j son&action=parse&page=Valencia_Cathedral&prop=textion=1) there is a field which name is "*".. details
  • I've been researching how to do it, but cannot seem to figure out GSON.Thanks, sorry I couldn't figure it out by myself, by no means to I mean to seem as if I was asking for spoonfeeding.If anyone could offer some help, I would be greatly appreciative.. details
  • Is there any way to do it dynamically.. details
  • Is there any way to do it dynamically.. details
  • Yes Gson works well.. details
  • Please debug and tell us what causes the NPE.. details
  • Please debug and tell us what causes the NPE.. details
  • @Sam: Well it was working fine before with the same piece of code, any how i ll try to pass string object instead of null.... details
  • I have seen and understood easier examples.. details
  • still null value of title.. details
  • how are you controlling the thread-safety of this Map in the first place?. details
  • Right string would be like: CODESNIPPET_JAVA2 .. details
  • which works fine.. details
  • Ah, thank you StaxMan, good to know.. details
  • Correct, except that unlike Gson, Jackson does not automatically detect private fields (it can be configured to, with @JsonAutoDetect or globally).. details
  • I know that an answer has already been accepted, you could consider using the GSON library as well.. details
  • IT does exactly what you want, and there is lots of documentation and examples out there, and the library is even quite well documented: URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] URL_http://www.javacreed.com/simple-gson-example/ [ URL_http://www.javacreed.com /simple-gson-example/] Hope this helps for your future projects.. details
  • IT does exactly what you want, and there is lots of documentation and examples out there, and the library is even quite well documented: URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] URL_http://www.javacreed.com/simple-gson-example/ [ URL_http://www.javacreed.com /simple-gson-example/] Hope this helps for your future projects.. details
  • IT does exactly what you want, and there is lots of documentation and examples out there, and the library is even quite well documented: URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] URL_http://www.javacreed.com/simple-gson-example/ [ URL_http://www.javacreed.com /simple-gson-example/] Hope this helps for your future projects.. details
  • IT does exactly what you want, and there is lots of documentation and examples out there, and the library is even quite well documented: URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] URL_http://www.javacreed.com/simple-gson-example/ [ URL_http://www.javacreed.com /simple-gson-example/] Hope this helps for your future projects.. details
  • They recommend to use the underlying parser API and then the CODETERM1 method onward, so you don't have to parse intermediary objects, which sounds like a good approach to me.. details
  • They recommend to use the underlying parser API and then the CODETERM1 method onward, so you don't have to parse intermediary objects, which sounds like a good approach to me.. details
  • Does GSON have some sort of Auto Mapping to the best suited object, so i dont have to make a custom object handler and deseraialize the String twice?. details
  • Please help, if you could tell me how to fix this?. details
  • Thanks.. details
  • Please help, if you could tell me how to fix this?. details
  • Try some thing like below:Take a bean eg: ExampleBeanIn ExampleBean take a propetry of another List of Your Values eg: List values; And then try to convert GSON to List like below CODESNIPPET_JAVA1 .. details
  • To make this problem clear take the 3 examples below the json is called Extra and it has the field Unit which is always a string and it has the field Value which can be a decimal(example 1), an object(example 2) or a list of objects(example 3) depending on the value of the field Unit.. details
  • For example, to support a new CODETERM6 type: CODESNIPPET_JAVA5 .. details
  • Using this, you can also create other implementations based on the type of shape and add them to the CODETERM5 to support them.. details
  • :) .. details
  • Hope this will help you.. details
  • the google library, GSON, is WAY BETTER and very useful.. details
  • I had the same problem and found the answer URL_http://stackoverflow.com/questions/15731215/get-key-names-from-json- object-using-gson [here] Best regards!. details
  • this works completely fine and returns the list CODETERM1 .. details
  • Thanks in advance!. details
  • So, is there a tool in java as descriptive as jsonlint for the validation messages?.. details
  • The JSON that is coming in looks like this.. details
  • Most of what I have done has been smooth as butter but for some reason I am having issues converting JSON timestamp strings into CODETERM1 objects.. details
  • Most of what I have done has been smooth as butter but for some reason I am having issues converting JSON timestamp strings into CODETERM1 objects.. details
  • See URL_http://groups.google.com/forum/?fromgroups #!topic/google-gson/hFpBXbudMRQ.. details
  • I'm trying to do this without having to write separate TypeAdapterFactory's for each class (Imagine if we have 100 different class with DateTime fields in them that require different formats) TIA!. details
  • For Movie object, I want to serialize the date as "Saturday, August 24 2013", but for LogEvent, "20130824T103025.123Z".. details
  • but i would prefer to know how to do it (if possible) with both methods .. details
  • I have a JSON file like this: CODESNIPPET_JAVA1 .. details
  • But havent had any luck.. details
  • I found the exact solution i need from this link URL_http://www.androidhive.info/2012/01/android-json-parsing-tutorial / Thank you very much Mr. Ravi Tamada.. details
  • Im only interested in knowing what's in the "item" object so i assumed the above class would work when calling: CODESNIPPET_JAVA3 .. details
  • Thanks :) .. details
  • Can you please rewrite your class and change clss type to be String, and set in it the full class name of the class you want to hold?. details
  • I admit I am not a user of GSon, but passing Class<?> sounds strange to me.. details
  • EDIT After reading URL_http://stackoverflow.com/questions/5554217/google-gson- deserialize-listclass-object-generic-type [this] post it seems that you use of CODETERM1 is correct.. details
  • When I use MyObject instead of T everything is running fine and MyObject is correct.. details
  • I have some problems with implementation of Json Deserialization in my Android application (with Gson library) I've made class like this CODESNIPPET_JAVA1 .. details
  • Problem is that result.posts list after call holds one Array of LinkedTreeMap Objects(with correct values so problem is Deserialization) instead of MyJson Objects.. details
  • You're free to pick a chosen answer if it did any help.. details
  • You're free to pick a chosen answer if it did any help.. details
  • If you're looking for good _Generics_ support try URL_http://code.google.com/p/google-gson/ [Google-Gson] .. details
  • If you're looking for good _Generics_ support try URL_http://code.google.com/p/google-gson/ [Google-Gson] .. details
  • If you want to work with json go this library, this library has a nice support URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] .. details
  • Thanks .. details
  • If you want to work with json go this library, this library has a nice support URL_https://code.google.com/p/google-gson/ [ URL_https://code.google.com/p/google - gson/] .. details
  • Thanks .. details
  • Gson does not have any support for this (there is no requirement for JSON to be encoded in ASCII).. details
  • In languages like Python, this is easily done, because the default setting in the standard Python JSON library has ensure_ascii=True: CODESNIPPET_JAVA1 .. details
  • Is there a setting to replicate Python like behaviour?. details
  • I know that at least following support this mode of operation: Jackson Gson Genson For Jackson, basic Streaming API usage is talked about URL_http://www.cowtowncoder.com/blog/archives/2009/01/entry_132.html [here] (for example); but one thing that does not show is how to bind objects once you are positioned at the right place.So assuming JSON like: CODESNIPPET_JAVA1 .. details
  • Gson is extremely to use and if you are not worried about performances then it is a good choice.. details
  • Additional information about good practices: You should implement your own toString() method for your classes to have better readability for debugging.. details
  • Please, anyone can help me?Thanks .. details
  • It looks like Gson has a streaming API, which is what you want: URL_https://sites.google.com/site/gson/streaming [ URL_https://sites.google.com/site/gson/streaming ] .. details
  • @NatRitmeyer, an explanation of why you believe this to be the case would be useful to OP.. details
  • Thank you .. details
  • Input JSON and get Java classes:) .. details
  • To use it make a call like this: CODESNIPPET_JAVA2 .. details
  • How to parse this kind of json String using Gson?. details
  • this class returns null value for the while retrieving sites and names .. details
  • this class returns null value for the while retrieving sites and names .. details
  • Yes but the issue is that I know how to serialize/deserialize simple jsons using gson, I am trying to figure out how to do this when the object it returns in the json is not set.. details
  • Does Gson have something like WRITE_NULL_MAP_VALUES (Jackson)?. details
  • Looking at this: URL_http://jackson.codehaus.org/1.6.5/javadoc/org/codehaus/ja ckson/map/SerializationConfig.Feature.html [ URL_http://jackson.codehaus.org/1.6.5 / javadoc/org/codehaus/jackson/map/SerializationConfig.Feature.html] It looks like jackson json has a configuration in which only maps will have their null values serialized, but Gson only appears to have serialization of all null values, or none at all .. details
  • Now use GSON like this: CODESNIPPET_JAVA2 .. details
  • Of course you should provide getters/private access to the data fields in the MyObject class, but this pretty much explains the idea.. details
  • Alternatively you can keep working with JSONObject, it should have getters, like this: JSONObject jsonObject getObjectSomehow(); jsonObject.get("name"); Hope this helps .. details
  • Note that there are plenty of other ways to parse those first 4 values, use whatever makes sense for your situation (e.g.. details
  • The URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [GSON-documentation] recommends accumulating values first.. details
  • I want to need the first four values of eah array and skip rest of the values like: CODESNIPPET_JAVA2 .. details
  • This is working but the inner loop is not breaking correctly.. details
  • To satisfy the second example: CODESNIPPET_JAVA3 .. details
  • The above example satisfies the first example from the original post.. details
  • An API my application is communicating with sends responses that look like: CODESNIPPET_JAVA1 .. details
  • How would I model a Gson object that can handle a dynamic field?. details
  • I would like to design a Gson object to handle this and was wondering what the best way would be.. details
  • I would personally recommend using something like GSON and Jackson.. details
  • They will get the job done quicker and easier than any algorithm / method you alone can think of in a short amount of time.. details
  • Hope this helps!. details
  • They are well built and fast mappers.. details
  • They will get the job done quicker and easier than any algorithm / method you alone can think of in a short amount of time.. details
  • @JamesBaxter Please post concrete questions about what you tried and what doesn't work.. details
  • Zip Object simple form: CODESNIPPET_JAVA1 .. details
  • JsonResponse Object simple form: CODESNIPPET_JAVA3 .. details
  • I created a base customTypeAdapterFactory and then extended it for each class that needed special serialization.. details
  • Seems like only one will fire off and it never takes the second one into considering.. details
  • If i do it with each one by itself it seems to work fine.. details
  • Thank you everyone for the help.. details
  • Thanks <---------------------------- SOLUTION I managed to read URL_http://stackoverflow.com/questions/11271375/gson-custom- seralizer-for-one-variable-of-many-in-an-object-using-typeadapter [Gson- custom-seralizer-for-one-variable-(of-many)-in-an-object-using-TypeAdapter] and it helped me out greatly.. details
  • mapper.readValue(json, Boolean.class); -- This won't work, because the JSON does not represent a Boolean type/value.. details
  • The JSON is an object with a single property, and that property is a Boolean (or boolean) type value.. details
  • Make sure you poke around GsonBuilder to see all of the configurations Gson supports!.. details
  • I hope it helps.. details
  • I hope it helps.. details
  • I have a json like this: CODESNIPPET_JAVA1 .. details
  • Awesome!. details
  • I am trying to use gson but doesnt seem to work well if the values in hashmaps are hashmaps instead of simple strings.. details
  • seems to work well.. details
  • Thanks, that's what I am already using now -- just want to find out if there a function I didn't know that will do the same.. details
  • GSON-Deserialization doesn't map correct classes.. details
  • This looks pretty similar to this one I answered over here --> URL_http://stackoverflow.com/questions/17730345/gson-custom- deserialization/17730843#17730843 [Gson-custom-deserialization] .. details
  • Take a look here for an example of how to use gson to convert it to nice juicy data: URL_http://stackoverflow.com/questions/1688099/converting-json-to- java/1688182#1688182 [Converting-JSON-to-Java] .. details
  • Take a look here for an example of how to use gson to convert it to nice juicy data: URL_http://stackoverflow.com/questions/1688099/converting-json-to- java/1688182#1688182 [Converting-JSON-to-Java] .. details
  • I've been trying to use GSON for the most part and haven't had much luck with examples I've found.. details
  • Or alternatively I need to alter the server to response to something like this?. details
  • I know I can use Gson, and create a class like this: CODESNIPPET_JAVA2 .. details
  • Please, help me figure this out.. details
  • [empty grid]( URL_http://i.stack.imgur.com/gAfAx.jpg ) The line "console.log("data->results: "+data.results) ;"shows the Json in the browser JavaScript console, like this: CODESNIPPET_JAVA5 .. details
  • I am getting complete page, but empty grid:!. details
  • CODETERM5 is like this:** CODESNIPPET_JAVA2 .. details
  • Thank you.. details
  • And then changing the JSP line with specifying data: to be like: CODESNIPPET_JAVA7 .. details
  • Thanks.. details
  • What does the JSON string look like with only one object?. details
  • I ran into this issue, in which I had a small number of fields I wanted to exclude only from serialization, so I developed a fairly simple solution that uses Gson's CODETERM1 annotation with custom exclusion strategies.. details
  • Gson itself doesn't have anything like this.. details
  • Is there any way to test dynamically if all fields are being parsed into the Java object?. details
  • Let's take Gson as example: you may use Gson customize serializer like following (I create class Users, otherwise other List will use MySerializer, which is not expected) CODESNIPPET_JAVA1 .. details
  • It should be something like this: CODESNIPPET_JAVA1 .. details
  • It is not exactly a _manual parsing_, but it is not that different, since you have to tell Gson how to deal with each JSON value.... details
  • I have a json response that looks like this: CODESNIPPET_JAVA1 .. details
  • And the Deserializer class would look like this: CODESNIPPET_JAVA4 .. details
  • EDIT Well, just to make my comment in @MikO's answer more readable: I'll add a list of an object to the json output, so json response should look like this: CODESNIPPET_JAVA3 .. details
  • Also, any suggestions on how this could be accomplished using any other library (like gson, flexjson, etc) is also interesting.. details
  • Too much code for this task, checkout this library URL_https://github.com/kodart/Httpzoid [ URL_https://github.com/kodart/Httpzoid ] It uses GSON internally and provides API that works with objects.. details
  • You could try URL_https://code.google.com/p/google-gson/ [gson] , whose URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Compact-Vs.-Pretty- Printing-for-JSON-Output-Format [constructor-supports-pretty-printing] : CODESNIPPET_JAVA2 .. details
  • You could try URL_https://code.google.com/p/google-gson/ [gson] , whose URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Compact-Vs.-Pretty- Printing-for-JSON-Output-Format [constructor-supports-pretty-printing] : CODESNIPPET_JAVA2 .. details
  • _Serialization: (same class works for fromJson() as well)_ CODESNIPPET_JAVA2 .. details
  • _Serialization: (same class works for fromJson() as well)_ CODESNIPPET_JAVA2 .. details
  • When using testing this, i see that CODETERM1 returns a non-null value.. details
  • Rules I don't know how many keys i'll have All values will be Strings I'd like for map to be addressable by a key Where some of the values are Strings and others are Numbers.. details
  • One good for this work is [Gson]( URL_http://code.google.com/p/google-gson/) .. details
  • One good for this work is [Gson]( URL_http://code.google.com/p/google-gson/) .. details
  • :-) But seriously, we have a procedure where we query the DB and return a common pattern.. details
  • great comparison post.. details
  • great comparison post.. details
  • ( URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] ) and I assume it's also possible with Jackson ( URL_http://jackson.codehaus.org/ [ URL_http://jackson.codehaus.org/ ] ) though I would suggest the lighter GSON for something this simple.. details
  • The rest should be pretty trivial (Make a generic type class), check out the GSON docs if you're really having trouble.. details
  • ( URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] ) and I assume it's also possible with Jackson ( URL_http://jackson.codehaus.org/ [ URL_http://jackson.codehaus.org/ ] ) though I would suggest the lighter GSON for something this simple.. details
  • That's it, but how can I serialize a pojo or simple Java object(like a Map) direct to JSON?, something like I do in Gson: CODESNIPPET_JAVA2 .. details
  • it works perfectly fine.. details
  • When I run the following code to save a JSON: CODESNIPPET_JAVA1 .. details
  • Have a look at my tutorial to get an idea of what is possible with Gson: URL_http://pragmateek.com/javajson-mapping-with-gson/ [Java/JSON-mapping-with- Gson] Enjoy!. details
  • :) .. details
  • Will be very appreciative for any help.. details
  • I have a JSON object like this: CODESNIPPET_JAVA1 .. details
  • I need the entire Enum as json which I think GSON doesn't do!.. details
  • Hope this helps... .. details
  • I appreciate any help!. details
  • You should use a JSON library that can build JSON from a Java data structure, like URL_https://code.google.com/p /google-gson/ [gson] .. details
  • Ask the original creator to use a standard library for creating JSONs, or at least use a validator.. details
  • Ask the creator to use a validator If you have received the String from an external source, it's perfectly legitimate to ask for a _valid_ json you can work with.. details
  • You should use a JSON library that can build JSON from a Java data structure, like URL_https://code.google.com/p /google-gson/ [gson] .. details
  • Ask the creator to use a validator If you have received the String from an external source, it's perfectly legitimate to ask for a _valid_ json you can work with.. details
  • Ask the original creator to use a standard library for creating JSONs, or at least use a validator.. details
  • I'm not sure if it's the optimal way to do it, but I will update my post with what I have at the moment and see if you guys have any suggestions.. details
  • It is a bit like you were asking why try an android when iphone exists and is widely used.... details
  • However main advantages of Genson are : faster then Gson, more usefull features and is more flexible (you can add yourself new features in a more easy way).. details
  • It is a bit like you were asking why try an android when iphone exists and is widely used.... details
  • However main advantages of Genson are : faster then Gson, more usefull features and is more flexible (you can add yourself new features in a more easy way).. details
  • Any particular reason to try Genson instead of proven and widely used packages like Jackson or GSON?. details
  • I liked GSON too but found that Jackson was considerably faster in my use case and just as easy to use.. details
  • I liked GSON too but found that Jackson was considerably faster in my use case and just as easy to use.. details
  • Syntax is a lot cleared and it works without any problem.. at least as far as I tested it.. details
  • Would you please explain why?. details
  • Personally, I prefer Jackson as according to URL_http://www.martinadamek.com/2011/02/04/json-parsers-performance-on- android-with-warmup-and-multiple-iterations/ [test-benchmarks] , it's faster than GSON.. details
  • Personally, I prefer Jackson as according to URL_http://www.martinadamek.com/2011/02/04/json-parsers-performance-on- android-with-warmup-and-multiple-iterations/ [test-benchmarks] , it's faster than GSON.. details
  • You might find it useful ... .. details
  • Thanks.. details
  • For example, in your case, you may create a JSONObject like the following and invoke its toString() function.. details
  • For example, in your case, you may create a JSONObject like the following and invoke its toString() function.. details
  • For example, in your case, you may create a JSONObject like the following and invoke its toString() function.. details
  • For example, in your case, you may create a JSONObject like the following and invoke its toString() function.. details
  • Not sure what exact task you're working, but there are many JSON libraries for Java which can do this for you such as URL_http://json.org/java/ [json-in- java] and URL_https://code.google.com/p/google-gson/ [google-gson] .. details
  • Not sure what exact task you're working, but there are many JSON libraries for Java which can do this for you such as URL_http://json.org/java/ [json-in- java] and URL_https://code.google.com/p/google-gson/ [google-gson] .. details
  • It's lightweight and faster than Gson.. details
  • Like : CODESNIPPET_JAVA1 .. details
  • Adapter can be like : CODESNIPPET_JAVA2 .. details
  • Jackson does a much better job at detecting types for maps, and it is far easier to configure than GSON: URL_https://github.com/FasterXML/jackson- databind [ URL_https://github.com/FasterXML/jackson-databind ] .. details
  • Jackson does a much better job at detecting types for maps, and it is far easier to configure than GSON: URL_https://github.com/FasterXML/jackson- databind [ URL_https://github.com/FasterXML/jackson-databind ] .. details
  • I have json object with arbitary values inside.. details
  • While Gson is a good library, you actually don't need it.. details
  • For starters, the documentation URL_http://developer.android.com/reference/org/json/package-summary.html [here] will be a very helpful reference tool if you're just learning JSON parsing.. details
  • I would also recommend using Gson as posted by elf_zwlf.. details
  • @gigadot A good way to debug, it would have quickly highlighted the problem :).. details
  • @gigadot A good way to debug, it would have quickly highlighted the problem :).. details
  • maybe it's easier to construct an object d with the data above and serialise it to json using gson and compare.. details
  • I've just written an article about it on my blog: URL_http://pragmateek.com /javajson-mapping-with-gson [ URL_http://pragmateek.com/javajson-mapping-with-gson ] And here is the section you're interested in: URL_http://pragmateek.com /javajson-mapping-with-gson/#Preserving_type_information [ URL_http://pragmateek.com/javajson-mapping-with - gson/#Preserving_type_information] Please ask if you still have the issue.. details
  • Indeed JSON does not keep the type information** so when Gson will deserialize the document it will create only Message instances**, not instance of subclasses like _TimeMessage_, because it has no way of guessing the correct type.. details
  • Show your effort, I will be happy to help.. details
  • It's really simple.. details
  • Show your effort, I will be happy to help.. details
  • It's really simple.. details
  • Gson deserialize json with varying value types.. details
  • What would be the best way to do this with Gson?. details
  • I need the object whenever it's available and i need a deserializer to return null whenever the value of "in_wanted" is a boolean.. details
  • I'm trying to deserialize a CODETERM1 with Gson, one the values' type can vary, the value "in_wanted" can be either a CODETERM2 or a CODETERM3 .. details
  • Please, see my example: CODESNIPPET_JAVA1 .. details
  • Take a look at this Json parsing guide using native tools and Gson library that I wrote: URL_https://blog-emildesign.rhcloud.com/?p=746 [Json-Parsing] Maybe you will find it useful.You can download the full project from there as well to run and test it for yourself.. details
  • My idea was to create a message wrapper like this: CODESNIPPET_JAVA1 .. details
  • This solution is great for serializing (I repeat, that is not a problem), but while deserializing I would get the message type and loose the message itself, at least if I don't parse it twice.. details
  • Another idea, was to send a token to identify the message, before the JSON string, like: CODESNIPPET_JAVA2 .. details
  • EDIT: this is because the client has a reactor-like structure: it runs in a loop and dispatches messages to appropriate handlers.. details
  • I am currently working on a thin-client application, where the communication happens through JSON-serialized message objects.. details
  • it is very simple with Gson create class for your single set recordlike CODESNIPPET_JAVA1 .. details
  • EDIT If Jackson doesn't support it, can GSON Support this operation.. details
  • I can't do it, because i have many (many!). details
  • How can i simply deserialize (serialization seems fine) this complex structure without adding custom deserialializastion code for each type?. details
  • Finally there are several (many!). details
  • Now, i have create a non-args constructor in the class "A", but no luck.. details
  • I have read about "InstanceCreator" but it looks like i would have to create an "InstanceCreator" for each concrete class that extends "A"!. details
  • That being said, you can do something like this: CODESNIPPET_JAVA1 .. details
  • where Foo is class CODETERM1 and serializing an instance of MData using gson creates json like this CODESNIPPET_JAVA2 .. details
  • I have a lot of existing entities that have the key/value attribute and the requirement is to have a flat json and I'm looking into a way to tweak the generation so I can get the desired output.. details
  • URL_https://code.google.com/p/google-gson/ [Google's-GSON] is very easy to use and well-documented if you are new to this stuff.. details
  • Then parse your JSON response using a CODETERM6 , like this: CODESNIPPET_JAVA3 .. details
  • Now you can access all the values using your CODETERM7 , for example: CODESNIPPET_JAVA4 .. details
  • Note: if you only want to get the GUID value, you don't need to create a class CODETERM8 , and you can use the same parsing code, but using a generic CODETERM9 in the CODETERM10 , i.e., CODETERM11 .. details
  • And remember, you cannot call network operations on UI thread!. details
  • And remember, you cannot call network operations on UI thread!. details
  • There seems to be a standard technique for converting JSON objects into DBObject i.e CODESNIPPET_JAVA1 .. details
  • The gson library has some really useful stuff, and in the link above, this problem has been solved in one direction - (it allows you to convert from DBObjects to JsonArrays) but not the other way.. details
  • It's valid for class files, but GSON clearly doesn't like it, so you should avoid the option.. details
  • Or is there any other way to iterate first level tag and then I can declare it something like this CODESNIPPET_JAVA4 .. details
  • I have a JSON which contains generic values.. details
  • Edit: Note that this only works because your anonymous class can be cast to CODETERM6 .. details
  • Gson uses reflection and doesn't care whether or not a class implements CODETERM1 .. details
  • Thanks for pointing that out!.. details
  • I guess GSON will be a big help for you.See here URL_http://stackoverflow.com/questions/15565862/parsing-json-object- into-a-string/16730531#16730531 [Parsing-json-object-into-a-string] There is a samplecode as well .. details
  • Your Class should look like this: CODESNIPPET_JAVA3 .. details
  • Your Class should look like this: CODESNIPPET_JAVA3 .. details
  • I think this 2nd solution is much better!. details
  • I think this 2nd solution is much better!. details
  • It shows the value for "success" and "status" but arraylist showing null for name and end_time .. details
  • Something like this should work for you, although obviously the best thing would be fix the serialization issue!. details
  • Something like this should work for you, although obviously the best thing would be fix the serialization issue!. details
  • please post an example of your json string.. details
  • _Note: I assume that you only want to get the data of the first element of the CODETERM5 array, since it seems that it is what you want looking at your code and mainly looking at URL_http://stackoverflow.com/questions/16599397 /how-do-i-use-googles-gson-to-get-a-certain-value-from-a-json-response [this- other-question-of-yours] ._ .. details
  • How do I use Google's Gson to get a certain value from a JSON response?. details
  • I am currently trying to parse through a the front page of Reddit using their cool website feature in which you can add /.json to any site to get the json of the page.. details
  • Plain and simple.. details
  • If you don't like to have many classes in your project, you can just use nested classes and your project will look cleaner... .. details
  • I have the following JSON and I'm only interested in getting the elements CODETERM1 , CODETERM2 and CODETERM3 .. details
  • Using Gson**, is it possible to parse this JSON to get those values without creating the whole classes structure representing the JSON content?. details
  • _Note: The code into the deserializer is quite straightforward, so I guess you'll have no problem to understand it... For further info see URL_http ://google-gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/overview- summary.html [Gson-API-Javadoc] _ .. details
  • Then you have to deserialize your JSON like: CODESNIPPET_JAVA3 .. details
  • i would recommend you to use gson from google.. details
  • You need to mimic the structure of the data and then the gson library will take care of everything, just make sure they match.. details
  • Can Gson work with something like this?. details
  • However, then you are trying to parse the same JSON response with the class CODETERM4 , which obviously doesn't _match_ the JSON response... moreover it makes no sense at all to parse the same response twice!. details
  • If your first parsing is actually working, if you then want to access the CODETERM5 object, just do: CODESNIPPET_JAVA2 .. details
  • Thank you for the effort :-) .. details
  • SOLUTION thanks to MikO Classes are: CODESNIPPET_JAVA2 .. details
  • In app I call it like this CODESNIPPET_JAVA5 .. details
  • Otherwise, and this is probably the most _elegant_ solution, you need to write a URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Writing-a-Deserializer [custom-deserializer] .. details
  • And I'm converting the icon from byte array to Bitmap like this : CODESNIPPET_JAVA4 .. details
  • Thanks in advance .. details
  • I convert the image to byte array like this : CODESNIPPET_JAVA3 .. details
  • I would greatly appreciate if you can help me solve this problem.. details
  • You can solve this problem by specifying the correct parameterized type for your generic type.. details
  • _Note_: looking at your class CODETERM2 and your JSON response, I think you'll have trouble parsing your CODETERM3 and CODETERM4 fields, so I suggest you to parse them as strings and then do the correct transformation... or you'll have to create a URL_https://sites.google.com/site/gson/gson-user- guide#TOC-Writing-a-Deserializer [custom-deserializer] .. details
  • I suggest you to take a brief look to URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Using-Gson [Gson-documentation] , it's few lines and you'll understand it better... First you serialize your array correctly in your client, with: CODESNIPPET_JAVA1 .. details
  • You should parse the JSON string passed as a parameter, and you can do it with Gson as well, like this: CODESNIPPET_JAVA2 .. details
  • _EDIT: My previous answer wasn't correct, see this new one..._ You are not using Gson correctly... You are serializing the objects well, but you're not doing a correct deserialization.... details
  • Now you have to repeat the deserializing operation in your client to parse the response and get again a CODETERM3 ... _Note_: You should never try to do things like serialize/deserialize JSON (or XML...) manually.. details
  • Always use libraries for this kind of things!. details
  • A manual solution may work fine in a particular situation, but it can't be easily adapted to changes, thus, if your JSON responses change, even only slightly, you'll have to change a lot of code.... details
  • E.g., I can use Gson like this: CODESNIPPET_JAVA2 .. details
  • Now it is easy to convert this file (or string) to a Java class (e.g: CODETERM1 ) if I use Gson or Jackson or JsonSimple or another Java/JSON third-party library.. details
  • Any help would be greatly appreciated.. details
  • I have a class that doesn't serialize properly with Gson (class is just name and HashMap) so I wrote a custom serializer to print the name and the key, value pair from the HashMap.. details
  • And then add the students to the map like this: CODESNIPPET_JAVA3 .. details
  • Note that now you do have the string CODETERM10 , associated with a student as the key in the map... Now you will have more or less the result you want, but not exactly!. details
  • I get output like this: CODESNIPPET_JAVA4 .. details
  • I have tried URL_http://stackoverflow.com/questions/6856937/gson-custom- serializer-in-specific-case [this] and URL_http://stackoverflow.com/questions/13970871/java-gson-custom-serializer- and-deserializer-special-requirement [this] .. details
  • Also, for easier JSON creating parsing you should take a look at JSON mapper libraries: URL_https://code.google.com/p/google-gson/ [GSON] or URL_http://jackson.codehaus.org/ [Jackson] .. details
  • Also, for easier JSON creating parsing you should take a look at JSON mapper libraries: URL_https://code.google.com/p/google-gson/ [GSON] or URL_http://jackson.codehaus.org/ [Jackson] .. details
  • Then it continues parse the JSON, and: In CODETERM20 it see that there must be some pairs of key (string) and value (some object).. details
  • However, in the JSON response it finds three elements CODETERM10 , CODETERM11 and CODETERM12 , but none of them has the same name CODETERM13 , so Gson skip all these values and assigns CODETERM14 to the attribute CODETERM15 .... details
  • You passed the type of CODETERM17 , and the JSON response starts with an object CODETERM18 ... so far everything is OK!. details
  • And in the JSON response it finds exactly that, some pairs of strings CODETERM21 , CODETERM22 and CODETERM23 , and some objects CODETERM24 , so it can keep parsing happily... _P.S:_ To go further, note that you could have in your class CODETERM25 these attributes: CODESNIPPET_JAVA4 .. details
  • Thank you :) .. details
  • It seems correct to me, and it should display : "amine1" but it gives me a _nullPointerException_ at : _ListTeleServices.getTeleService(ListTeleServices.java:12)_ which is : CODESNIPPET_JAVA6 .. details
  • Gson allows you to have a single class to _wrap_ all the possible responses, like this: CODESNIPPET_JAVA2 .. details
  • Note that this approach gets a bit more tedious if you have many different JSON requests and those requests are very different to each other, but even so I think is a good and very simple approach... .. details
  • This way you can parse many different JSON responses using only your CODETERM3 class, like this: CODESNIPPET_JAVA3 .. details
  • Once you have your JSON request parsed into your class, you can transfer the data from the _wrap_ class to a concrete CODETERM4 object, something like: CODESNIPPET_JAVA4 .. details
  • Note that this approach gets a bit more tedious if you have many different JSON requests and those requests are very different to each other, but even so I think is a good and very simple approach... .. details
  • I am working on some server code, where the client sends requests in form of JSON.. details
  • The most correct way to parse your JSON response with GSON would be to create classes to _wrap_ your response, for example: _[Note: edited code based in comments, changing the type for a Map, so that it can accept an arbitrary number of app objects in the JSON reponse...]_ CODESNIPPET_JAVA1 .. details
  • Note: other ways are possible, but as far as I understand this is the best one and the clearest one as well, morover taking into account that your JSON response is very simple.. details
  • I'm using it pretty effectively.. details
  • Yes, now it works, thank you.. details
  • I loop through parsed Objects in Map and I am processing them - is there some way how to solve out if Object is another Map and not string value?. details
  • Thanks for now.. details
  • I'm comparison-shopping for gson libraries, and would love to hear if gson 2.0+ has improved performance much.. details
  • I'm comparison-shopping for gson libraries, and would love to hear if gson 2.0+ has improved performance much.. details
  • But I have to accept above answer because he replied first but appreciate your effort too thanks!. details
  • But I have to accept above answer because he replied first but appreciate your effort too thanks!. details
  • I think its working but let me check completely then I'll accept it :).. details
  • Can you please elaborate it why we are doing this?. details
  • I think its working but let me check completely then I'll accept it :).. details
  • I am sure that string is being generated correctly because its not getting generated manually its coming from method "toJson" of Gson class.. details
  • The "json string" is a mess, not a valid JSON string.... details
  • Of course I could just swap the "foos" parameter for "bars", but if it's possible, I'd like my software to do it for me.. details
  • I have JSON like this: CODESNIPPET_JAVA1 .. details
  • I can turn it into CODETERM1 pretty simply with GSON, like this: CODESNIPPET_JAVA2 .. details
  • Google's own URL_https://code.google.com/p/google-gson/ [GSON] is the best I have found.. details
  • Google's own URL_https://code.google.com/p/google-gson/ [GSON] is the best I have found.. details
  • Also it's very well documented and understood.. details
  • Also it's very well documented and understood.. details
  • Also it's very well documented and understood.. details
  • Also it's very well documented and understood.. details
  • This should give you enough that you can pretty much plug and play.. details
  • If you work a lot with JSON data I would really recommend that you use URL_https://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] .. details
  • If you work a lot with JSON data I would really recommend that you use URL_https://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] .. details
  • The resulting value will be of the type CODETERM9 .. details
  • The resulting value will be of the type CODETERM9 .. details
  • If you want to parse the elements (more CODETERM5 s) within the CODETERM6 you can do so by using the classes provided by the URL_https://developer.android.com/reference/org/json/package-summary.html [org.json] package that is being distributed with Android or use another JSON library like URL_https://code.google.com/p/google-gson [GSON] or URL_http://jackson.codehaus.org [Jackson] .. details
  • It's good practice to create a model class containing the CODETERM13 's elements as member variables and providing a Constructor that takes the CODETERM14 containing the objects data values.. details
  • It's good practice to create a model class containing the CODETERM13 's elements as member variables and providing a Constructor that takes the CODETERM14 containing the objects data values.. details
  • If you want to parse the elements (more CODETERM5 s) within the CODETERM6 you can do so by using the classes provided by the URL_https://developer.android.com/reference/org/json/package-summary.html [org.json] package that is being distributed with Android or use another JSON library like URL_https://code.google.com/p/google-gson [GSON] or URL_http://jackson.codehaus.org [Jackson] .. details
  • The API uses an API_KEY to authenticate and is used like this URL_https://api.company.com/api/systems?key=123ABC [ URL_https://api.company.com/api/systems?key=123ABC ] Code CODESNIPPET_JAVA2 .. details
  • ADD:As long, as I know that the length of my JSON will never exceed ~500, and that the structure remains always the same, is it good enough to use the following workaround?. details
  • For the JSON could you use Google Gson ( URL_https://code.google.com/p/google- gson/ [ URL_https://code.google.com/p/google-gson/ ] ) is a very useful and easy library convert JSON-JAVA and vice-versa.. details
  • For the JSON could you use Google Gson ( URL_https://code.google.com/p/google- gson/ [ URL_https://code.google.com/p/google-gson/ ] ) is a very useful and easy library convert JSON-JAVA and vice-versa.. details
  • But As per my understanding you want to parse the JSON if you want to do that in java then you can use GSON jar from google...you can also check simple example here URL_http://stackoverflow.com/questions/7668507/gson-handle-object-or-array [Gson-handle-object-or-array] .. details
  • If u cud b specific that would be great.. details
  • Thanks!.. details
  • Thanks, but i still dont quite understand what I should do.. details
  • Thanks, but i still dont quite understand what I should do.. details
  • But of course you could use some other library that offers a bit more of flexibility like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] A small sample for gson and jackson can be found URL_http://stackoverflow.com/a/5314988/1001027 [here] and URL_http://stackoverflow.com/a/2525152/1001027 [here] respectively.. details
  • But of course you could use some other library that offers a bit more of flexibility like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] A small sample for gson and jackson can be found URL_http://stackoverflow.com/a/5314988/1001027 [here] and URL_http://stackoverflow.com/a/2525152/1001027 [here] respectively.. details
  • But of course you could use some other library that offers a bit more of flexibility like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] A small sample for gson and jackson can be found URL_http://stackoverflow.com/a/5314988/1001027 [here] and URL_http://stackoverflow.com/a/2525152/1001027 [here] respectively.. details
  • But of course you could use some other library that offers a bit more of flexibility like URL_http://code.google.com/p/google-gson/ [Gson] or URL_http://jackson.codehaus.org/ [Jackson] A small sample for gson and jackson can be found URL_http://stackoverflow.com/a/5314988/1001027 [here] and URL_http://stackoverflow.com/a/2525152/1001027 [here] respectively.. details
  • Why are you using that code to parse your JSON, instead of using the _usual_ way, as you do in URL_http://stackoverflow.com/questions/16181018/looping- nested-arraylist-to-display-values-from-json-using-gson/16188159#16188159 [this-other-question] of yours?. details
  • The easiest way to test this is to try serializing a byte[] using gson and see how the output is different from the JSON.Net version.. details
  • You may have to write a custom deserializer which works with the JSON.Net byte[] data.. details
  • Thanks .. details
  • I want to log every values from JSON file but all i get CODETERM1 What am i doing not right here?. details
  • Now i using gson to parse this values, Every thing is working up-until CODETERM1 but when i try to loop throw "subItemPart" I'm unable to retrieve values of subItemPart object.. details
  • Thanks.. details
  • Looping nested ArrayList to display values from JSON using gson.. details
  • Q: I have json that have values in form of nested element, As you can see below i have values from server inside the array and than there is second array inside it.. details
  • Otherwise, you need to write your own Instance Creator, like URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-an- Instance-Creator [this] .. details
  • did that work does gson put the raw string into the string value?. details
  • You could then let another Gson-call with that dynamic class do the mapping of the inner class.. details
  • All numeric values in JSON are double-precision floating point.. details
  • Thanks.. details
  • I have a simple JSON file I'd like to parse (units.json) using gson and Java: CODESNIPPET_JAVA1 .. details
  • I appreciate the help!. details
  • any example would be appreciated.. details
  • Both are very easy to use, I prefer Gson because it works without annotations in the POJOs.. details
  • Gson does a great job for this; You can read a little tutorial about it here which should get you started; URL_http://www.javacodegeeks.com/2011/01/android-json-parsing-gson- tutorial.html [ URL_http://www.javacodegeeks.com/2011/01/android-json-parsing-gson - tutorial.html] .. details
  • I recently created a library for creating Gson objects fluently: URL_http://jglue.org/fluent-json/ [ URL_http://jglue.org/fluent-json/ ] It works like this: CODESNIPPET_JAVA1 .. details
  • Lastly there is mapping support in the API which allows you to map your domain objects to JSON.. details
  • The goal being when Java8 is released you'll be able to do something like this: CODESNIPPET_JAVA3 .. details
  • a call to an CODETERM10 -like function) before to give it to CODETERM11 ?. details
  • Moreover, to save the class I want to use the Google's URL_https://sites.google.com/site/gson [Gson] library and in particular the URL_http://google-son.googlecode.com/svn/trunk/gson/docs/jav adocs/com/google/gson/stream/JsonWriter.html [CODETERM3] class.. details
  • Can I save the class into a text file by using JSON via the CODETERM8 or I should encode or do something similar with the CODETERM9 field (e.g.. details
  • Thanks a lot in advance!. details
  • Could anyone please help and point me in the right direction, I'd be very greatful.. details
  • I prefer Jackson but when I evaluated it I found it was just too big for me to feel good about putting it in an android project so I went with GSON.. details
  • Thanks.. details
  • It has been funny (if a bit tricky since I'm not a Java expert).. details
  • My JSON looks correct according to them and all other places that I search, it seems fine.. details
  • I thought that Im strong enough to _play_ with Gson but I found some problem.. details
  • It works, but I need it as List Thank you, How to Fix it:** As guys say when I try to convert XML to JSON, the plugin converts CODETERM7 to CODETERM8 instead CODETERM9 .. details
  • Thanks to PeterMmm and R.J .. details
  • So I created followed classes and succeeded to convert above mentioned String to Java Object.. details
  • My code is simple: CODESNIPPET_JAVA5 .. details
  • I've been thinking for these two JSON library: Google Gson JSON.Simple XStream Google Gson is pretty awesome, it can serialize class object that have no-args constructor.. details
  • If the third approach is preferred, then note also URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-an- Instance-Creator [the-Instance-Creator-feature] , as it can provide another useful hook into customizing the deserialization process.. details
  • Now this string is sent to a python application which have the same two class definitions 'User' and 'Address' defined exactly like in Java above.. details
  • Each time gson sees a {}, it creates a Map (actually a gson StringMap ) Each time gson sees a '', it creates a String Each time gson sees a number, it creates a Double Each time gson sees a [], it creates an ArrayList You can use this facts (combined) to your advantage .. details
  • (Of course, I cannot currently think of any reason why such a thing could be useful.). details
  • Instead of meandering through the Gson (JSON) API with loops and conditionals, I'd prefer to use Gson for what I think it does best: provide for very simple (de)serialization processing with just a few lines of code.. details
  • I am not sure but it looks like they have some contrib (not part of Gson) that allows to add type information in the serialized stream, this allows Gson to deserialize back into the right type.. details
  • Most importantly, I can do the following.. CODETERM3 I am saving this big list of items in a special data object in JSON using Google's GSON library.. details
  • I then save it using the code below.. details
  • There are several other instances of this problem, so if there is any good solution to this that you good folks knowledge, it would help a lot.. details
  • Thanks!. details
  • This works fine.. details
  • If I use this code with a simple JSON object CODESNIPPET_JAVA2 .. details
  • age, name, and messages (not the values) are added to my ArrayList.. details
  • I have a JSON object that I'd like to get the key names from and store them in an ArrayList.. details
  • Thanks everyone!. details
  • This works fine.. details
  • Please i have a json response String like this: CODESNIPPET_JAVA1 .. details
  • In the latest rounds of performance tests posted at URL_https://github.com/eishay/jvm-serializers/wiki [ URL_https://github.com/eishay /jvm-serializers/wiki] , the results suggest that the combined performance of Gson serialization and deserialization could possibly be improved by about 25%, by using URL_https://sites.google.com/site/gson/streaming [the-streaming- API-of-Gson] instead of databinding.. details
  • (Note: One could also use the tree-model in the Gson API, instead of the streaming or databinding APIs, but it doesn't appear to offer any performance improvements over databinding.. details
  • In the latest rounds of performance tests posted at URL_https://github.com/eishay/jvm-serializers/wiki [ URL_https://github.com/eishay /jvm-serializers/wiki] , the results suggest that the combined performance of Gson serialization and deserialization could possibly be improved by about 25%, by using URL_https://sites.google.com/site/gson/streaming [the-streaming- API-of-Gson] instead of databinding.. details
  • EDIT My Above CODETERM1 works when response is like below..But what about CODETERM2 item also contains CODETERM3 CODESNIPPET_JAVA3 .. details
  • I have done like this... CODESNIPPET_JAVA2 .. details
  • I have done like this... CODESNIPPET_JAVA2 .. details
  • EDIT My Above CODETERM1 works when response is like below..But what about CODETERM2 item also contains CODETERM3 CODESNIPPET_JAVA3 .. details
  • Jackson and Gson keep being the best library to help you.. details
  • With Gson, it would be something like the following code snippet (not tested).. details
  • @AedonEtLIRA Yes thats correct.. details
  • Thanks Usman.. details
  • Your link looks like normal JSON.. details
  • I have tested and benchmarked both Gson and Jackson and I can tell you that in some use cases Jackson is 15 times faster on both serialization and deserialization, even on very big objects.. details
  • EDIT : I am aware that my example doesn't follow a lot of the best practices pointed out in the jackson page but it allows me to have simple to understand code that looks like the Gson.toJson and Gson.fromJson (which I started with too and switched on later to Jackson) Gson.toJson(object) JsonMapper.INSTANCE.mapper().writeValueAsString(object)Gson.fromJson(object, clazz) JsonMapper.INSTANCE.mapper().readValue(jsonString, clazz); .. details
  • I have tested and benchmarked both Gson and Jackson and I can tell you that in some use cases Jackson is 15 times faster on both serialization and deserialization, even on very big objects.. details
  • It works great for class but fails when trying to deserialize an interface.. details
  • For each specific response, the "data" field is populated with dynamic fields, but all other keys (meta, etc.). details
  • There is no way to improve the Gson library serialization and deserialization time.. details
  • What is the best way to optimize deserialization?. details
  • Write a custom deserializer for GSON to handle the special creation of those objects.. details
  • I have successfully started using GSON to serialize and de-serialize a hierarchy of objects in my Android application.. details
  • Thanks in advance!. details
  • I just know this kind of format: CODETERM1 , what's the braces in above for?. details
  • It also uses a very fast GSON mapper to return your own objects back to you as the result of the query, instead of a list of BasicDBObjects.. details
  • My last attempt was to just try to get something simple out of this and am getting a CODETERM1 on the second of these lines: CODESNIPPET_JAVA2 .. details
  • I am familiar with gson and have gotten this working in the past, but I always had to simplify my data down to just an object, which makes me end up have to make multiple calls to get the data.. details
  • There are "well" known :) issues of Gson to serialize Map when the key is derived from object and its not a "native" data type.Please use this CODESNIPPET_JAVA1 .. details
  • The JobIOStatus is also similar.I am successfully able to create a JSON string of Collection using GSON using the following TypeToken CODESNIPPET_JAVA3 .. details
  • But, when I try to recreate the Collection object using the JSON string returned by Gson and the same CODETERM1 , the key of the CODETERM2 hashmap is always returned as NULL whereas the value is successfully created.. details
  • By now, the fastest way I have found is using Gson: CODESNIPPET_JAVA2 .. details
  • But since you might have variable fields like CODETERM1 and CODETERM2 , you might want to store the "network" value as a string and then extract fields out of it when required.. details
  • Google gson is good.. details
  • In addition, URL_http://code.google.com/p/google-gson/ [Google-GSON] is an awesome library for serializing Java objects into JSON.. details
  • I know its good to use gson or Xstream like things., but I need to do using Marshaller.How to achieve it?. details
  • If you want to convert json string to your custom class(ex.GetMailsDataResponseDto), I recommend Google Gson.. details
  • Using URL_https://code.google.com/p/google-gson/ [gson] it is much simpler.. details
  • Using URL_https://code.google.com/p/google-gson/ [gson] it is much simpler.. details
  • Any help appreciated.. details
  • I am pretty new to JSON parsing and still learning, I don't fully get it how I am supposed to parse this.. details
  • that's pretty much the relevant code: CODESNIPPET_JAVA2 .. details
  • In other words, I want all the lists, as well as each CODETERM2 , to be "named".. details
  • Thanks in advance!. details
  • In my code, I am trying to convert a CODETERM1 into JSON using the URL_http://json.org/java/ [Java-JSON] library (however I'd also accept any answer using GSON as well).. details
  • So first I'm asking if someone could be so kind as to point out what my desired JSON _should_ look like in order to be proper; and then second if someone could help me massage my CODETERM3 list so that either Java JSON or GSON can produce the desired output.. details
  • Works like a charm.. details
  • Thank you!. details
  • Works like a charm.. details
  • Thank you!. details
  • Thank you!. details
  • We intend to enhance Gson in a latter version to support properties as an alternate mapping for indicating Json fields.. details
  • However, there are good arguments to support properties as well.. details
  • results in CODETERM1 I have lots of classes that follow the standard java bean convention CODESNIPPET_JAVA3 .. details
  • When I have an entity like this CODESNIPPET_JAVA1 .. details
  • Well, you almost get there, just send the JSON string to your server, and use Gson again in your server: CODESNIPPET_JAVA1 .. details
  • I'm not quite familiar with Gson, but I know it's pretty commonly used today, and your code seems no problem.. details
  • If this doesn't make any difference, please print out your JSON string before you send the request, let's see what's in there.. details
  • Thanks in advance!. details
  • Then using Gson I create the JSON object** like: CODESNIPPET_JAVA3 .. details
  • The best thing to do is get into GSON.. details
  • {"key":["a","b"],"value":12} wouldn't be enough?. details
  • Usually the positive login response comes like below: CODESNIPPET_JAVA1 .. details
  • Cheers Paulo Almeida .. details
  • I hope I could make it clear and I'm looking forward for suggestions.. details
  • I hope I could make it clear and I'm looking forward for suggestions.. details
  • If I need to "massage" the JSON string, not sure what I need to do to make GSON play nicely with it.. details
  • Thanks in advance.. details
  • Thanks in advance.. details
  • Thank you,I will take a look at GSON.. details
  • This doesn't look like a JSON string.. details
  • This doesn't look like a JSON string.. details
  • Thank You!. details
  • This really helped!. details
  • I'm trying to deserialize (using gson) a JSON object that looks like this: CODESNIPPET_JAVA1 .. details
  • the full JSON file can be seen URL_https://public- api.wordpress.com/rest/v1/sites/drewmore4.wordpress.com/posts/?pretty=1 [here:] EDIT: SOLVED.. details
  • Thank you for your time.. details
  • You will need of course has a generic class T to make it works Type fooType new TypeToken>() {}.getType();gson.toJson(foo, fooType); gson.fromJson(json, fooType); .. details
  • If you actually go forward with this you can probably make it slightly more efficient by looking up and caching the methods in TypeAdapterFactory.create().. details
  • Brilliant example.. details
  • If you actually go forward with this you can probably make it slightly more efficient by looking up and caching the methods in TypeAdapterFactory.create().. details
  • I would be thankful for any help or hints, that lead me to the solution.. details
  • I would be thankful for any help or hints, that lead me to the solution.. details
  • My CODETERM1 looks like follow : CODESNIPPET_JAVA1 .. details
  • Thanks.. details
  • But In JSON, each child of CODETERM6 is having different name like CODETERM7 which are being reflected in POJO MessageDefault.java.. details
  • Please, see my example: CODESNIPPET_JAVA1 .. details
  • Please, see my example: CODESNIPPET_JAVA1 .. details
  • Or, you know, a TestCase!. details
  • This video URL_http://www.youtube.com/watch?v=xHXn3Kg2IQE [Android-REST-client- applications] is really useful.. details
  • This video URL_http://www.youtube.com/watch?v=xHXn3Kg2IQE [Android-REST-client- applications] is really useful.. details
  • Also, _google-gson_ will save you much time if you work with json data and you will feel surprise when developing.. details
  • generates this: {"eatwithrustyspoon":{**"urlList":null**,"device":"iPad","os":"iPhone OS","peer_id": and GSON looks like this: CODESNIPPET_JAVA2 .. details
  • Thank you very much .. details
  • Any help would be appreciated and I am very new to GSON and retrieving JSON objects.. details
  • strings CODETERM1 and CODETERM2 are random values from server.. details
  • You can easily serialize this with a variety of JSON libraries like URL_http://jackson.codehaus.org/ [Jackson] or URL_http://code.google.com/p /google-gson/ [GSON] .. details
  • You can easily serialize this with a variety of JSON libraries like URL_http://jackson.codehaus.org/ [Jackson] or URL_http://code.google.com/p /google-gson/ [GSON] .. details
  • GSON mapping null value for POJO properties.. details
  • Thanks in advance.. details
  • The correct should be convert the json string into a CODETERM2 .. details
  • The correct should be convert the json string into a CODETERM2 .. details
  • I would consider JSON to be more structured than Excel, but that's just me.... details
  • Note, Gson is provided with play!framework distribution, so you are free to use it .. details
  • Note, Gson is provided with play!framework distribution, so you are free to use it .. details
  • Parsing GSON with Lists seems to be pretty straight forward URL_http://rishabhsays.wordpress.com/2011/02/24/parsing-list-of-json-objects- with-gson/ [ URL_http://rishabhsays.wordpress.com/2011/02/24/parsing-list-of-json - objects-with-gson/] .. details
  • I'm trying to parse a json object that is int when it's good, and string when it's not, here's an example : CODESNIPPET_JAVA1 .. details
  • Scientific notation is valid in JSON and anything handling JSON should be able to parse that correctly (to exactly the same value as if scientific notation were not used).. details
  • You can use this library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Pretty easy tutorial about it here: URL_http://www.mkyong.com/java/how-do- convert-java-object-to-from-json-format-gson-api/ [ URL_http://www.mkyong.com/java /how-do-convert-java-object-to-from-json-format-gson-api/] Or you can write a custom toJson method to your classes or an util Json (not a big deal) in your case it should be something like that (i didn't test it): CODESNIPPET_JAVA1 .. details
  • You can use this library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Pretty easy tutorial about it here: URL_http://www.mkyong.com/java/how-do- convert-java-object-to-from-json-format-gson-api/ [ URL_http://www.mkyong.com/java /how-do-convert-java-object-to-from-json-format-gson-api/] Or you can write a custom toJson method to your classes or an util Json (not a big deal) in your case it should be something like that (i didn't test it): CODESNIPPET_JAVA1 .. details
  • and would like to do something like this with it: CODESNIPPET_JAVA2 .. details
  • I am working a simple facade for JSON mapping libraries.. details
  • Any help would be greatly appreciated.. details
  • Thanks.. details
  • But it is very easy to extend and further extensions will not make it much longer.. details
  • But it is very easy to extend and further extensions will not make it much longer.. details
  • An example that appends "test": 1 pair to each object looks something like: CODESNIPPET_JAVA1 .. details
  • This approach meets my preference to work with the right API for the right job, minimizing the use of tools like Gson to just handle serialization/deserialization (which is what I understand it was designed for).. details
  • Is there any way where I can set value of key1 to some value (let say "Test") in each array, without converting things into POJO .. details
  • This would enable me to do things like: CODESNIPPET_JAVA4 .. details
  • They cannot be based on a path or nesting level, but annotations and names are fine.. details
  • Thanks anyways for pointing me to an interesting and possibly helpful library.. details
  • Thanks anyways for pointing me to an interesting and possibly helpful library.. details
  • It's also (to me) more elegant than the Gson library.. details
  • I hope this post helps others out.. details
  • I might go back to it depending on how things go later down in the application because it works well with bi-directional relationships without requiring you to "mute" one side.. details
  • Thanks, I understand how GSON maps it to POJO's like this, but I actually dont know the keys.. details
  • Im trying your HashMap solution, and I think im getting them correctly in my get_lists as an array of Lists, but im having trouble mapping them to HashMaps in ListItem.. details
  • Im trying your HashMap solution, and I think im getting them correctly in my get_lists as an array of Lists, but im having trouble mapping them to HashMaps in ListItem.. details
  • they vary in the sense that, keys and values may be added or altered.. details
  • they vary in the sense that, keys and values may be added or altered.. details
  • Thanks, work well.... details
  • Thanks, work well.... details
  • Thanks, work well.... details
  • Thanks, work well.... details
  • On server side you could also use standard Grails JSON converter (but you could use Gson, if you prefer), see URL_http://grails.org/Converters+Reference [ URL_http://grails.org/Converters+Reference ] .. details
  • This will return the Gson object representations (JsonElement) rather than a user defined class, but avoids the problem of conversion to scientific notation.. details
  • I've looked through similar issues like Converting Json to Java such as URL_http://stackoverflow.com/questions/4981471/simple-json-to-java-convertion- using-gson [Simple-Json-to-Java-convertion-using-GSON] .. details
  • I have tried both the code above and this line as well and got the same results both times.. details
  • Any help would be appreciated.Thanks,Eric Now I just have to fix my javascript to treat the groups array as an array and not a string: CODESNIPPET_JAVA5 .. details
  • This CODETERM1 tells to Gson that you want to deserialize to a Map of unknown value type.. details
  • You would be tempted to specifiy something like CODETERM2 , but you can not do this in Java so the solution is to use what they called TypeToken in Gson.. details
  • This is how initial json looks like CODESNIPPET_JAVA1 .. details
  • But I don't know if your content is like that.. details
  • This will work on Jackson as well as many other Java JSON libs (Gson, Genson at least), and will also be faster method to use.. details
  • This will work on Jackson as well as many other Java JSON libs (Gson, Genson at least), and will also be faster method to use.. details
  • Try this lib, that's a good one, with the jackson we use only in the server side, because jackson is more slow in the Android than gson, at least in our test.. details
  • Try this lib, that's a good one, with the jackson we use only in the server side, because jackson is more slow in the Android than gson, at least in our test.. details
  • Nevertheless I can think of a few specific situations where it might be necessary, or at least convenient (like when working with code you can't modify or such).. details
  • Edit to add:** A typical use for Gson would be something like: CODESNIPPET_JAVA1 .. details
  • Could you please take a look at my code: Servlet: CODESNIPPET_JAVA1 .. details
  • edit2: The message is correctly displayed in a browser, when lauching the servlet using "Run File" command in NetBeans.. details
  • I'm trying to send some simple string to test data transfer between my servlet and an applet(servlet -> applet, not applet -> servlet), using Json format and Gson library.The resulting string in the applet should be exactly the same as the original message, but it isn't.I'm getting 9-character < !DOCTYPE** string instead.. details
  • Fields 'id' and 'name' are correctly injected but the field 'properties' stays null.. details
  • I try to deserialize this JSON string with Gson like that: CODESNIPPET_JAVA3 .. details
  • Properties' keys are String, Properties' values can be a String, int, Array, boolean, Map etc.. details
  • Do you know what I'm doing wrong?Thanks in advance for your help!. details
  • Ok, will be exploring it... thanks :-).. details
  • Thanks a lot!!. details
  • Not exactly the most direct route to getting his program working ... ;-).. details
  • Not exactly the most direct route to getting his program working ... ;-).. details
  • Further more GSON really seems to be faster than Jackson Json.. details
  • Further more GSON really seems to be faster than Jackson Json.. details
  • Edit to Add:** Someone upvoted this recently and re-reading it I thought "Huh, you know, you could do this yourself and it might be handy".. details
  • If I get a Server-response like CODETERM1 everything works as expected.. details
  • and an Error Object like this: CODESNIPPET_JAVA2 .. details
  • But if the response is like this CODETERM2 I'll get an CODETERM3 object where CODETERM4 is CODETERM5 and CODETERM6 is 0!. details
  • To make things clear: Supoose I have a simple Object like this CODESNIPPET_JAVA1 .. details
  • Or you can directly download jar from here and put it in your class path URL_http://code.google.com/p/google- gson/downloads/detail?name=gson-1.0.jar&can=4&q= [ URL_http://code.google.com/p /google-gson/downloads/detail?name=gson-1.0.jar&can=4&q=] To send Json to client you can use spring or in simple servlet add this code response.getWriter().write(json); .. details
  • Or you can directly download jar from here and put it in your class path URL_http://code.google.com/p/google- gson/downloads/detail?name=gson-1.0.jar&can=4&q= [ URL_http://code.google.com/p /google-gson/downloads/detail?name=gson-1.0.jar&can=4&q=] To send Json to client you can use spring or in simple servlet add this code response.getWriter().write(json); .. details
  • I highly recommend the rest of the API documentation for JsonObject as well.. details
  • I highly recommend the rest of the API documentation for JsonObject as well.. details
  • My json input looks like: CODESNIPPET_JAVA1 .. details
  • Please help.. details
  • Thanks Chin i could parse it.. details
  • This part, i would strongly recommend that you look into a good JSON library, GSON from Google seems to be a good one.. details
  • This part, i would strongly recommend that you look into a good JSON library, GSON from Google seems to be a good one.. details
  • Nice work Asim.. details
  • Can you please post an answer to the question yourself and then accept that answer so that we can close this question?. details
  • content-type is "application/json" How do I tell Gson to encode the Umlauts properly (the Umlauts are in the values, not the keys)?. details
  • In order to do this, you simply need to call Gson.toJson(map) where map holds key myText and value as List or array.. details
  • Gson includes the class CODETERM1 which might be the simplest thing for you to use: URL_http ://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Jso nObject.html [ URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/c om/google/gson/JsonObject.html] However, Gson's way more powerful than that -- you can actually just serialize a plain old Java object directly, which is probably more elegant than the intermediate step of converting existing data to a CODETERM2 (see this existing answer: URL_http://stackoverflow.com/questions/1668862/good-json- java-library/1668951#1668951 [Good-JSON-Java-Library?]. details
  • But this would be something like: Object: CODESNIPPET_JAVA1 .. details
  • Thanks!. details
  • The communication structure is like CODESNIPPET_JAVA1 .. details
  • I hear it's faster than GSON but that is hearsay on my part.. details
  • It just seems way cleaner and easier to understand for the next guy.. details
  • I have a very simple example below, and it runs, but the resulting answer is empty, ie: my Answer objects's text field is empty.. details
  • I would recommend using the URL_http://code.google.com/p/google-gson/ [GSON-library] for the serialization/ deserialization.. details
  • I would recommend using the URL_http://code.google.com/p/google-gson/ [GSON-library] for the serialization/ deserialization.. details
  • Please read the question before updating your answer any further.. details
  • XML and JSON are unrelated, so this is actually _two_ questions: For JSON, although "unofficial", a popular library is URL_http://code.google.com/p/google-gson/ [GSON] .. details
  • XML and JSON are unrelated, so this is actually _two_ questions: For JSON, although "unofficial", a popular library is URL_http://code.google.com/p/google-gson/ [GSON] .. details
  • Such an interface would be fairly simple to implement in GSON, XStream etc.. details
  • And you are decoupled from one of the many many XML or JSON libraries, so clients are freer to pick their favorite.. details
  • (added) None of the answers were what I really wanted ("yes, in javax.obscure.interfaces there's what you want") but thanks for the replies.. details
  • and I thought GSON had something similar as well.. details
  • I've checked out GSON and Jackson, but neither seem to support this.. details
  • so you can convert json into object like that CODESNIPPET_JAVA4 .. details
  • I have a JSON data I want to parse using GSON which looks like the following: CODESNIPPET_JAVA1 .. details
  • Thank you in advance!. details
  • You can use the URL_http://code.google.com/p/google-gson/ [Google's-Gson] library.It works like this: CODESNIPPET_JAVA1 .. details
  • You can use the URL_http://code.google.com/p/google-gson/ [Google's-Gson] library.It works like this: CODESNIPPET_JAVA1 .. details
  • OK I try that way!. details
  • Thanks!.. details
  • Question 2: It says that when you create your Gson object, you can specify a version, and then any field annotated with @Since and a version number greater than that will be ignored.. details
  • @Kaiser69 Like I said, you can always change the type of params to JsonElement and deserialize later the params value using Gson again.. details
  • If it is typed with a super-class or a super- interface, then you will has some problems.. details
  • @Kaiser69 You can do pretty much everything you want with GSon to deserialize JSon strings.. details
  • It seems that you took it for granted, but I recommend debugging your code.. details
  • The CODETERM7 should be an CODETERM8 of Objects (lets call them CODETERM9 ) !. details
  • to hold the data, and use fromJson() to populate it, but I am unsure of exactly how it should be set up, as well as how to handle the large "items" array.. details
  • :) P.S.. details
  • I'm new to stackoverflow and fairly new to Java, please go easy on me.. details
  • Any hints/tips/examples would be much appreciated, thanks.. details
  • If not, it sets the return value in the response and serializes it.. details
  • The inner parts will be able to translate back to a class appropriately but between the rules I'd like to have an option for "AND" as well as "OR" with nesting.. details
  • as all of you can see, I have not asked that many questions before, so if you have any feedback for me on how to improve my question: let me know!. details
  • EDIT 1:**The bundle class is a standard bundle, fi: Bundle args new Bundle(); args.putint("someint", 1); See the updated stacktrace... EDIT 2:**If I take a single instance of a TabInfo, by using a String.class as an argument, eg: CODESNIPPET_JAVA4 .. details
  • How do I resolve this?. details
  • The fastest library I know of is Jackson, but I personally prefer Google-GSON because it's fast enough and yet remains very easy to use.. details
  • The fastest library I know of is Jackson, but I personally prefer Google-GSON because it's fast enough and yet remains very easy to use.. details
  • The fastest library I know of is Jackson, but I personally prefer Google-GSON because it's fast enough and yet remains very easy to use.. details
  • The fastest library I know of is Jackson, but I personally prefer Google-GSON because it's fast enough and yet remains very easy to use.. details
  • You should use a JSON tool like Google's GSON: URL_http://code.google.com/p /google-gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • You should use a JSON tool like Google's GSON: URL_http://code.google.com/p /google-gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • GSON how to parse array with dynamic type.. details
  • Looking at this Json file, KEY is always a String, but VALUE sometimes is a String but sometimes is an typed object with two String fields.. details
  • How to map JSON values onto a different class with GSON.. details
  • But I get null values.. details
  • How can I map the JSON values onto a slightly different class so I can still use best practice naming conventions in each language.. details
  • the issue is that the value coud also be CODESNIPPET_JAVA2 .. details
  • Thanks in advance.. details
  • Why dont you use Gson library its very easy to convert any object into json array, json object Download Gson library then use like CODESNIPPET_JAVA1 .. details
  • What's the best way to parse this without tying myself in knots?. details
  • I'm not set on using Gson and would be happy for a solution using Jackson or the built in library.. details
  • The end goal is for Android implementation so I would prefer to use use serialization.. details
  • Thanks EDIT: My attempt at an "object model" CODESNIPPET_JAVA2 .. details
  • GSON is simple and robust but way to slow acording to me.. details
  • So what I actually need help with is selecting the value from the key CODETERM1 and then parse its value into an Boolean.. details
  • _This is what the JSON that I'm trying to parse looks like:_ CODESNIPPET_JAVA1 .. details
  • The data-type of the value that I want to parse is simply an Boolean**.. details
  • GSON is simple and robust but way to slow acording to me.. details
  • To accomplish what you are trying to do, you will need to use a GSON custom serializer/deserializer.. details
  • This code assumes it's an array of strings, it shouldn't be hard to modify to suit your particular array structure.. details
  • The field attributes do not include the value of that field.. details
  • Excluding certain fields from Serialization based on value in GSON.. details
  • Seems like it's empty now.. details
  • still doesn't work* So when you print out savedPlayers.toString() what does it look like now?. details
  • You may want to use GSON instead of JSONReader, as it's easier to use.. details
  • This way works perfectly for me.. details
  • Thanks a lot first of all.. details
  • The following example with nested class works for me: CODESNIPPET_JAVA1 .. details
  • Rather make it a standalone or a nested class instead.. details
  • There are 3rd party library available like Jackson, gson, felxjson.. details
  • I'm uncertain as to what might be going wrong, so thanks for your guidance!. details
  • They may be similar but I am not having much luck in piecing the pieces together.]. details
  • I'm uncertain as to what might be going wrong, so thanks for your guidance!. details
  • Try that and see if it works.. details
  • I did figure out how to accomplish my task of taking a JSONArray and alphabetizing by "name" element.. details
  • thanks!.. details
  • You can also try something like this with Gson Library: CODESNIPPET_JAVA1 .. details
  • GSON is a great Java library to parse JSON to and from Java objects.. details
  • He is already using Gson!. details
  • Try using GSON, all you need is your two ValueObject class and should be good enough.. details
  • @Pablo: It looks to me like the no-arg constructor for TypeToken is still protected in Gson 2.1, so the above should still work.. details
  • @Aronnn - I've tried to answer that below.. details
  • To serialize to JSON you will use a code that looks like this: CODESNIPPET_JAVA3 .. details
  • To serialize to JSON you will use a code that looks like this: CODESNIPPET_JAVA3 .. details
  • Pretty printing with GSON in one line: CODESNIPPET_JAVA1 .. details
  • Thank you Steve.. details
  • Thanks you!. details
  • Thanks.. details
  • Unlike many other JSON libraries, URL_https://sites.google.com/site/gson/streaming [Gson-supports-streaming] which means you can examine the file in small chunks.. details
  • Use a library like Gson or Jackson and map the JSON to a Java Object.. details
  • Like gson.. details
  • Try that and see if that works.. details
  • I think the data structure should be like this, but it doesn't work.. details
  • Thanks!. details
  • I have not tried a lot of combinations, but it seems like URL_http://code.google.com/p/google-gson/ [google-gson] keeps the order of attributes in CODETERM1 .. details
  • I have not tried a lot of combinations, but it seems like URL_http://code.google.com/p/google-gson/ [google-gson] keeps the order of attributes in CODETERM1 .. details
  • I have not however tested this extensively with your use-case, but it should be simple to check if it has the expected output UPDATE rather than using SVN/CVS to check if your files were modified, I found that GSON has built-in URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Versioning-Support [versioning-support] which may or may not address your issue, from their docs: Multiple versions of the same object can be maintained by using URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/annotations/Since.java [@Since] annotation.. details
  • In order to leverage this feature, you must configure your Gson instance to ignore any field/object that is greater than some version number.. details
  • I have not however tested this extensively with your use-case, but it should be simple to check if it has the expected output UPDATE rather than using SVN/CVS to check if your files were modified, I found that GSON has built-in URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Versioning-Support [versioning-support] which may or may not address your issue, from their docs: Multiple versions of the same object can be maintained by using URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/annotations/Since.java [@Since] annotation.. details
  • Can someone please give me an idea on how to implement TypeAdapter, to be able to get the fields of child class+parent class if it is an instance of child class and only fields of parent class otherwise Thanks in advance .. details
  • Hope it helps.. details
  • I never thought it would be this easy and i dont even know what i wanted to do with the String.. details
  • Thank you very much.. details
  • You need to map json key-value to Class and its properties (variable member).then use Gson,s fromJson() method.If you want to check whether you have created correct class structer or not, you can again get Json from created class and check this with your original json.. details
  • It is a good general overview.. details
  • Thanks for this.. details
  • Thanks.. details
  • Jackson is a very efficient to do JSON Parsing** See this link:** URL_http://jackson.codehaus.org/ [ URL_http://jackson.codehaus.org/ ] Gson is provided by google which is also a good way to handle JSON.. details
  • I like the GSON.. details
  • All suggestions and helps rendered are sincerely appreciated by me, thank you for your time and effort!. details
  • Thank you.. details
  • You can solve this problem by specifying the correct parameterized type for your generic type.. details
  • look my comment for other answer suggesting gson ..!. details
  • Thanks, seems to work!.. details
  • This works fine when the company element is populated as in the first example in the JSON: ISPC Seychelles;Company: ISPC Seychelles However, if the element is not populated as in the second example, I get the following output: Westin Miyako Kyoto; null What I would like is the following output: Westin Miyako Kyoto; Company: null .. details
  • Thank you very very MUCH!!. details
  • Thanks very much !. details
  • @colinD, I edited the problem, I explained a bit further...hope that gives better insight ;).. details
  • As a small improvement I'd suggest that you explicitly specify map type parameters, and use Map instead of HashMap for the TypeToken.. details
  • The above example works with GSON 2.2.2.. details
  • Thanks in advance.. details
  • Gson - how to parse dynamic JSON string with nested JSON?. details
  • I have JSON string with dynamic elements, till now I parse it into Map: CODESNIPPET_JAVA1 .. details
  • Now I need to solve thsi situation - one of these dynamic variables could be another JSON string.. details
  • Thanks for your help.. details
  • I have tried with this sintax but with no success... how exactly I should pass the server response in the second code-block?. details
  • Please switch to Jackson or Gson.. details
  • Some pull parser like GSON oder jackson would suit your task better (jackson claims to be faster, but also heavier jars and more dependencies - I prefer GSON) You may also consider simple databinding library: URL_https://github.com/ko5tik/jsonserializer [ URL_https://github.com/ko5tik/jsonserializer ] ( jars available from maven central ) With it parsing of JSON becomes looks this way: URL_https://github.com/ko5tik/accmeter/blob/master/src/main/java/de/pribluda/a ndroid/accmeter/file/SampleReader.java [ URL_https://github.com/ko5tik/accmeter/blo b/master/src/main/java/de/pribluda/android/accmeter/file/SampleReader.java] ( just provide java.io.Reader and class to fill fields in ) .. details
  • That looks like a clean solution to me.. details
  • GSON is correct.. details
  • How would I be able to handle this dynamically?. details
  • The return is in the following format: "success":1,"errors":[],"data":{"524":{"id":"524"}, "525":{"id":"525"}}** For the other returns I had data as an array of a class of my own creation, but for this return it says that it is an object and not an array.. details
  • It's more efficient to reuse a Gson instance.. details
  • It's more efficient to reuse a Gson instance.. details
  • For best performance, don't create a Gson instance on each use.. details
  • For best performance, don't create a Gson instance on each use.. details
  • I'm pretty sure GSON serializes/deserializes Maps and multiple-nested Maps (i.e.. details
  • Writing a custom serializer for gson is easy (although I've never tried with CODETERM2 ), the same probably holds for the other tool.. details
  • What would that look like?. details
  • JSON.NET byte arrays, are not interpreted the same way as that of gson - so it wont work without writing a JSON.NET compatible deserializer I think you need to keep looking at the data, try changing encodings and also, see if you can get a gson parser for java that gives you more control then this one does :) .. details
  • It all went perfectly fine until I've added a byte[] field to both classes.here are the classes definitions:C#: CODESNIPPET_JAVA1 .. details
  • the msg is the json string) When I don't send anything in the byte array it still works.. details
  • First thing to note about Gson is that it does not use getter/setter but only fields!. details
  • Actually Genson is faster and has more features than Gson and has performances close to jackson (but its a lot more lightweight) see URL_http://code.google.com/p/genson/wiki/Metrics [ URL_http://code.google.com/p/genson/wiki/Metrics ] .. details
  • If you don't want to use Genson, I really recommend you Jackson over Gson.. details
  • Actually Genson is faster and has more features than Gson and has performances close to jackson (but its a lot more lightweight) see URL_http://code.google.com/p/genson/wiki/Metrics [ URL_http://code.google.com/p/genson/wiki/Metrics ] .. details
  • I have not had good luck with this though and have not really spent time looking into why it has not worked well for me.. details
  • Here is some relevant discussion: URL_https://groups.google.com/forum/?fromgroups=#!searchin/google- gson/interface/google-gson/0ebOxifqwb0/OXSCNTiLpBQJ [ URL_https://groups.google.com/forum/?fromgroups #!searchin/google-gson/interface /google-gson/0ebOxifqwb0/OXSCNTiLpBQJ] .. details
  • Hi can i configure gson that he use int instead of double got data like: CODESNIPPET_JAVA1 .. details
  • and decode like: CODESNIPPET_JAVA3 .. details
  • Thank You!. details
  • I don't think you can have "Name/object1/field" you have to specify key name directly without hierarchy.refer URL_http://stackoverflow.com/questions/5796948/how-to-parse-dynamic-json- fields-with-gson [How-to-parse-dynamic-JSON-fields-with-GSON?]. details
  • I have tried the following to get the value of field1 but it doesn't work CODESNIPPET_JAVA2 .. details
  • Parsing JSON using Google GSON: reading values directly from child objects.. details
  • I'm using GSON but a JSON solution will also be fine.. details
  • I'll check this out !. details
  • Thanks for sharing.. details
  • I would like to do so by getting it to not put null objects, only empty values, and empty lists and arrays into the Json string.. details
  • Take a look at the GSON Library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Here are good examples: URL_https://sites.google.com/site/gson/gson-user-guide TOC-Primitives-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Primitives-Examples] CODESNIPPET_JAVA1 .. details
  • Take a look at the GSON Library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Here are good examples: URL_https://sites.google.com/site/gson/gson-user-guide TOC-Primitives-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Primitives-Examples] CODESNIPPET_JAVA1 .. details
  • Recommendations with examples are most welcome.. details
  • Thanks much.. details
  • Given the popularity of facebook, I was hoping to find some jars/lib that can do this already.. details
  • can you have two values in one column?. details
  • So I create a sort model object like so to take the input: CODESNIPPET_JAVA3 .. details
  • Upon reading the URL_http://struts.apache.org/2.x/docs/json-plugin.html [JSON-plugin-guide] I realize the plugin might be expecting a JSON string instead of this query map, in which case I normally go with GSON instead.. details
  • thanks, I've modified my answer.. details
  • URL_https://sites.google.com/site/gson/gson-user-guide#TOC-InstanceCreator- for-a-Parameterized-Type [The-Gson-user-guide-includes-a-section] on exactly what I understand you're trying to accomplish, though that documented example may still be incomplete.. details
  • Please visit: URL_http://usmanali112.blogspot.com/2012/07/java-read-json- files.html [Read-JSON-files-using-Java-gson-library] .. details
  • best of luck .. details
  • I did not find a solution to my problem of gson formatting numbers ending in 0 to scientific notation.. details
  • "value" is the json string.. details
  • I can trace full response dynamically by checking if "Team" key is instance of CODETERM2 or CODETERM3 but it would be great if a better solution is available for that.. details
  • Edit :**If my response is more dynamic.. CODESNIPPET_JAVA4 .. details
  • The code to convert works fine in all cases except for numbers ending in 0.. details
  • It converts those to a scientific notation number format: CODESNIPPET_JAVA2 .. details
  • The actual result:Java object : 268627104, 485677888, 5.068848E+8 Notice the last number is converted to a scientific notation format.. details
  • Thanks for the info.. details
  • Thank you for the suggestions, I have several things to try out now :).. details
  • use URL_http://code.google.com/p/google-gson/ [GSON] to format the string as JsonArray then traverse the JsonArray to get the values the code sample CODESNIPPET_JAVA1 .. details
  • use URL_http://code.google.com/p/google-gson/ [GSON] to format the string as JsonArray then traverse the JsonArray to get the values the code sample CODESNIPPET_JAVA1 .. details
  • It is a very good library to handle json.Create json parser first, it will parse the json string: CODESNIPPET_JAVA1 .. details
  • I'm using gson to convert a json string to a Java-Object.The value of result2 is exactly the same as the value of result1**.. details
  • Fortunately, so have URL_http://stackoverflow.com/questions/6223023/parsing-json-with-gson- object-sometimes-contains-list-sometimes-contains-object/6225906#6225906 [solutions] .. details
  • I would like to use this kind of Objects with json: CODESNIPPET_JAVA1 .. details
  • it seems json can't handle Object keys as array, so I would need to tranfer them like that: CODESNIPPET_JAVA2 .. details
  • I need to store imgurl's value in a separate string.. details
  • Thank you @maerics.. details
  • If you can't get Gson to do what you want, below is how you can accomplish this using MOXy's native JSON binding.. details
  • I would be grateful to any pieces of advice.. details
  • Since I don't care about these fields, the best approach in Gson is to write a custom ExckusionStrategy which can selectively ignore fields based on their name: URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/ gson/ExclusionStrategy.html [ URL_http://google-gson.googlecode.com/svn/trunk/gson / docs/javadocs/com/google/gson/ExclusionStrategy.html] .. details
  • This way you can prevent issues like recursion/no matching setter or getter and so on.... details
  • This way you can prevent issues like recursion/no matching setter or getter and so on.... details
  • When I inspect the returned object in my IDE (Eclipse), I can see that this is true -- the returned object has three members called equalsCalc() and another three called hashCode.. details
  • Once you have it in JSON format: URL_http://jquerymobile.com/demos/1.0/docs/pages /page-dynamic.html.. details
  • this works fine.After that, i want to add this String to anothe big jsonObject to send it to backend with other vars.. details
  • doesnt work, because after that there are only references in the jsonObject but no values.. details
  • doesnt work, because after that there are only references in the jsonObject but no values.. details
  • ), increments a counter each time it encounters a "{", decreases it each time it enouters a "}", and if the counter is at zero pass the buffer string to gson for parsing, clear the buffer and go on to the end of the file.. details
  • ), increments a counter each time it encounters a "{", decreases it each time it enouters a "}", and if the counter is at zero pass the buffer string to gson for parsing, clear the buffer and go on to the end of the file.. details
  • Serialization works fine with Gson.. details
  • Can someone show me how to write the deserializer (or suggest an alternative approach using Gson best practices)?. details
  • Have I not mapped the JSON correctly with respect to the Bean?. details
  • using getters and setters) access, but Gson only supports field access.. details
  • Private fields are intended to be inaccessible for the regular code, but in some special cases (such as serialization/deserialization) it's perfectly reasonable to access them directly.. details
  • It gives following output: {"testVar": 1} I expected 3 in the json string, but what I got was the value held by testVar variable of parentClass.. details
  • This version only shows parent's value in json.. details
  • I like to use URL_http://code.google.com/p/google-gson/ [GSON] to deserialize the following JSON String.. details
  • Besides the last class everything works fine.. details
  • Besides the last class everything works fine.. details
  • I like to use URL_http://code.google.com/p/google-gson/ [GSON] to deserialize the following JSON String.. details
  • You could try extending URL_https://google-gson.googlecode.com/svn/trunk/gson/ docs/javadocs/com/google/gson/stream/JsonWriter.html [CODETERM1] and overriding URL_https://code.google.com/p/google-gson/source/browse/trunk/gson/ src/main/java/com/google/gson/stream/JsonWriter.java#445 [the-method- CODETERM2] It doesn't seem to be built to be modified like this (you'll pretty much need to duplicate the existing code), but it should be possible to get it working.. details
  • You could try extending URL_https://google-gson.googlecode.com/svn/trunk/gson/ docs/javadocs/com/google/gson/stream/JsonWriter.html [CODETERM1] and overriding URL_https://code.google.com/p/google-gson/source/browse/trunk/gson/ src/main/java/com/google/gson/stream/JsonWriter.java#445 [the-method- CODETERM2] It doesn't seem to be built to be modified like this (you'll pretty much need to duplicate the existing code), but it should be possible to get it working.. details
  • When I use Gson to serialize an Object that contains a double value close to zero it is using the scientific E-notation: CODESNIPPET_JAVA1 .. details
  • switch off scientific notation in Gson double serialization.. details
  • Thanks!. details
  • Thank you.. details
  • Adobe Flex for exmaple handles XML very well, even better than JSON.. details
  • I personally prefer JSON for its JS like syntax, but XML is also good.. details
  • JSON parsers exist for practically any language and it is easy to use even when not using a JS engine, (Take google GSon for example that is able to convert JSON into corresponding objets with ease) which makes is a good candidate for cross- language communication - for example in a URL_http://en.wikipedia.org/wiki/Messaging_pattern [messaging-architecture] .. details
  • Adobe Flex for exmaple handles XML very well, even better than JSON.. details
  • I personally prefer JSON for its JS like syntax, but XML is also good.. details
  • Please explain how you would tell the Gson object to do that.. details
  • Is there any way to parse this Json input given that I can't assume how many levels of categories there are?Thanks in advance.. details
  • The only requirement is that the List of objects represented by the JSON array is wrapped in another class (like Category and ArrayOfCategory in my example).. details
  • and obtain a result like this: CODESNIPPET_JAVA2 .. details
  • Please any suggestion is welcome Thanks,Mario .. details
  • You can see how it works, and what other chars are escaped, by looking into the code of URL_http://code.google.com/p/google-gson/source/browse/tags/gson-2 .2.1/src/main/java/com/google/gson/stream/JsonWriter.java#125 [CODETERM11-class] .. details
  • You can see how it works, and what other chars are escaped, by looking into the code of URL_http://code.google.com/p/google-gson/source/browse/tags/gson-2 .2.1/src/main/java/com/google/gson/stream/JsonWriter.java#125 [CODETERM11-class] .. details
  • Issues with using Gson to pretty-print JSON String.. details
  • Could someone please suggest why this is happening... Ive got some code to pretty print some JSON.. details
  • Here is a simple piece of code that demonstrates the problem: CODESNIPPET_JAVA1 .. details
  • URL_http://code.google.com/p/google-gson/ [Googles-GSON] is a really nice json lib.. details
  • URL_http://code.google.com/p/google-gson/ [Googles-GSON] is a really nice json lib.. details
  • But for me this is very clear way of mapping JSON to objects.. details
  • The simplest way is to fill an object by simply letting the engine fill the fields using reflection to map them to the content of the file as URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [described-here] : the deserialization is just the call to CODETERM1 once you created your class.. details
  • URL_http://code.google.com/p/google-gson/ [Google-gson] is very simple to use both for encoding and decoding.. details
  • The simplest way is to fill an object by simply letting the engine fill the fields using reflection to map them to the content of the file as URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [described-here] : the deserialization is just the call to CODETERM1 once you created your class.. details
  • URL_https://code.google.com/p/google-gson/ [Google-GSON] I've used it many times, and it works like a champ.. details
  • URL_http://code.google.com/p/google-gson/ [Google-GSON] does this; I've used it on several projects and it's simple and works well.. details
  • URL_http://code.google.com/p/google-gson/ [Google-GSON] does this; I've used it on several projects and it's simple and works well.. details
  • since the input data is layed out like it.. details
  • To convert it using CODETERM1 now is quite easy: CODESNIPPET_JAVA4 .. details
  • Using GSON Create some classes that you want to handle the data, they can look something like: CODESNIPPET_JAVA2 .. details
  • I don't think there is beautifull way to do it in gson.. details
  • I would like to skip the CODETERM3 object and move the CODETERM4 object to the CODETERM5 object, like this: CODESNIPPET_JAVA2 .. details
  • I would like to skip the CODETERM3 object and move the CODETERM4 object to the CODETERM5 object, like this: CODESNIPPET_JAVA2 .. details
  • You'll probably want to use a special wrapper object in your data model like EmailAddressList to make this easy.. details
  • Unfortunately Gson doesn't natively support non-unique names in name/value pairs.. details
  • I'm building a client server web application and stuck on this: I'm getting an array of users "FriendsIDList:": CODESNIPPET_JAVA1 .. details
  • Is it any way to map this structure and manually retrive only this value or i need to parse all of this json myself without gson ?. details
  • gson json parser: value without key.. details
  • I want to parse a json structure like this: CODESNIPPET_JAVA1 .. details
  • It's literally as simple as String json new Gson().toJson(myBean);.. details
  • Thanks in advance... .. details
  • Is there any way to resolve this and obtain the same "json strings" from java and javascript?. details
  • UPDATE:**Even tried this way as well, but no use.. details
  • "** can someone please help how I do proceed, if not gson what would be other way to convert.. details
  • The code that sets this up looks like this: CODESNIPPET_JAVA1 .. details
  • Fixing the problem** Your best next step is to remove fields from CODETERM2 until serialization improves.. details
  • I was able to save another ~10ms by migrating from tree adapters (JsonSerializer/JsonDeserializer) to the new streaming adapter class CODETERM1 .. details
  • Once you isolate the problem URL_http://code.google.com/p /google-gson/issues/list [report-a-bug] to the Gson project and we'll happily fix the problem.. details
  • Once you isolate the problem URL_http://code.google.com/p /google-gson/issues/list [report-a-bug] to the Gson project and we'll happily fix the problem.. details
  • On my ThinkPad it took Gson ~260ms to serialize ~3MB of Gson, which is a respectable ~10Mbps.. details
  • To test the performance against hand writing a JSON serializer, I tested the following code and it could serialize the same array of Case objects approximately 10x faster than GSON.. details
  • This assumes a constructor like CODETERM7 and allows CODETERM8 instances to be immutable which is usually a Good Thing.. details
  • Register and use the custom serializer like this: CODESNIPPET_JAVA3 .. details
  • My POJO file for the sub-data is like this: CODESNIPPET_JAVA2 .. details
  • I appreciate all help, thank you.. details
  • Thanks for the help.. details
  • any help is greatly appreciated as i am fairly new to java as i come from SAS background.. details
  • I just posted it as the next best thing (which turned out to be better!).. details
  • Something like this: When empty: CODESNIPPET_JAVA1 .. details
  • Thanks for any help.. details
  • I don't want to deserialize all 20 fields manually (I know this is an option), I just want to call context.defaultDeserialize(), or something like that.. details
  • It all works already.. details
  • The Joey's answer works perfect.. details
  • I need something likedeserializedOBJ.params gson.fromJSON(json.object, ProtoAuth.class) What's the best way to do this?There is an alternative to do this, without write my own serializer/deserialer?. details
  • This is from json-lib, not gson!.. details
  • This is from json-lib, not gson!.. details
  • JSON returned by URL_http://localhost/authmanager.php [ URL_http://localhost/authmanager.php ] must look like this: CODESNIPPET_JAVA4 .. details
  • JSON returned by URL_http://localhost/authmanager.php [ URL_http://localhost/authmanager.php ] must look like this: CODESNIPPET_JAVA4 .. details
  • And then you can use returned string with URL_http://code.google.com/p/google- gson/ [Google-Gson] to map JSON to object of specified class, like this: CODESNIPPET_JAVA2 .. details
  • And then you can use returned string with URL_http://code.google.com/p/google- gson/ [Google-Gson] to map JSON to object of specified class, like this: CODESNIPPET_JAVA2 .. details
  • I'm using Gson and am trying to add a bunch of string values into a CODETERM1 like this: CODESNIPPET_JAVA1 .. details
  • There is nothing about the original problem that suggests switching APIs from Jackson to Gson is necessary, or otherwise makes for a simpler solution.. details
  • This could be easy with Gson or jackson Gson example CODESNIPPET_JAVA1 .. details
  • If it's a primitive type or assigned to something else, like a string, gson won't touch it.. details
  • This is really powerful because you can automagically instantiate your Java objects from the JSON representation.. details
  • This is really powerful because you can automagically instantiate your Java objects from the JSON representation.. details
  • It allows you to decode the JSON, and use it by getting values from it (as described in this question: URL_http://stackoverflow.com/questions/1395551/convert-a-json- string-to-object-in-java [Convert-a-JSON-string-to-object-in-Java?]. details
  • Here's a nice URL_http://www.mkyong.com/java/how-do- convert-java-object-to-from-json-format-gson-api/ [guide] that will help you get started that way.. details
  • ","to_u ser":null,"to_user_id":null,"to_user_id_str":null,"to_user_name":null}],"resul ts_per_page":1,"since_id":0,"since_id_str":"0"} I'm trying to use gson to convert this returned JSON into some kind of data structure such that I can extract useful data.. details
  • I have read through the gson documentation but it's going over my head to be honest - lots of new concepts there for me.. details
  • I have read through the gson documentation but it's going over my head to be honest - lots of new concepts there for me.. details
  • ","to_u ser":null,"to_user_id":null,"to_user_id_str":null,"to_user_name":null}],"resul ts_per_page":1,"since_id":0,"since_id_str":"0"} I'm trying to use gson to convert this returned JSON into some kind of data structure such that I can extract useful data.. details
  • Being new to this - the more detailed and in words of the fewest syllables the better!. details
  • The basic name:values are being populated correctly but the ArrayList is not.. details
  • Hey great to hear that buddy!. details
  • Thanks, I'll edit my post above with my new results.. details
  • Or!. details
  • :) .. details
  • Use URL_http://code.google.com/p/google-gson/ [Gson] : it will be as simple as CODESNIPPET_JAVA1 .. details
  • Use URL_http://code.google.com/p/google-gson/ [Gson] : it will be as simple as CODESNIPPET_JAVA1 .. details
  • but I was expecting to get something like this: CODESNIPPET_JAVA3 .. details
  • Thanks for your help.. details
  • I have tried setting a custom Type adapter with no luck.. details
  • but I was expecting to get something like this: CODESNIPPET_JAVA3 .. details
  • i'm just wondering why gson behaves like this.. details
  • Consider using some third party lib like GSON and Jackson, They are supposed to make developer's life easier.. details
  • Gson is also good for it: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] "Gson is a Java library that can be used to convert Java Objects into their JSON representation.. details
  • Gson is also good for it: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] "Gson is a Java library that can be used to convert Java Objects into their JSON representation.. details
  • This is slick, thank you!.. details
  • This is slick, thank you!.. details
  • for something simple like the question asked, GSON seems to be the win.. details
  • or gson (i have good experiences with that) or jackson (I don't have so good experiences with that).. details
  • Because the .NET DateTime json serialization is not a standard (according to Microsoft there is no such standard for DateTime) gson is not able to parse such formatted dates.. details
  • It would be fine, if .NET's DateTime and Java's Calendar would regard totally the same rules when it comes to conversion of local to UTC time.. details
  • Thanks for your time.. details
  • So this seems to work fine.. details
  • This of course is not a favoured one.... details
  • it is because your string starting with CODETERM1 when you parsing this type of Json with Gson then you need to prefix a label to it just i like did ( CODETERM2 ).. details
  • Actually Gson trying to map the label and its value but in your case your CODETERM3 doesnt contain Label by which Gson can map.. details
  • Any help as to why this is happening is much appreciated.. details
  • Any help as to why this is happening is much appreciated.. details
  • Please post a [SSCCE]( URL_http://sscce.org /) or at least* the actual code of your MyGuid class (except getters/setters).. details
  • Please post a [SSCCE]( URL_http://sscce.org /) or at least* the actual code of your MyGuid class (except getters/setters).. details
  • There's a library for converting Java objects to JSON called gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] Incidentally, if you're wanting to send an Ajax response rather than refreshing the page, add @ResponseBody to your method declaration: CODESNIPPET_JAVA1 .. details
  • There's a library for converting Java objects to JSON called gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] Incidentally, if you're wanting to send an Ajax response rather than refreshing the page, add @ResponseBody to your method declaration: CODESNIPPET_JAVA1 .. details
  • GSON is pretty good for JSON manipulation: very same question as yours is answered here: URL_http://stackoverflow.com/questions/6454889/cant-convert-string-to- jsonarray [Can't-Convert-string-to-JsonArray] .. details
  • I personally recommend the GSON library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] JSON makes it easy to round-trip your data, bot serializing and deserializing your JSON objects into the Java classes used by your app.. details
  • URL_https://sites.google.com/site/gson/gson-user-guide TOC-Serializing-and-Deserializing-Generic-Types [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Serializing-and Deserializing-Generic-Types] Also, as an aside, @Kamal makes a good point about converting your string to an array first in java.. details
  • I personally recommend the GSON library: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] JSON makes it easy to round-trip your data, bot serializing and deserializing your JSON objects into the Java classes used by your app.. details
  • Its really that easy.. details
  • Here you can find a URL_http://jsontools.berlios.de/ [tool] that can validate a JSON file, or you could just deserialize your JSON file with any JSON library and if the operation is successful then it should be valid ( URL_http ://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [google- json] for example that will throw an exception if the input it is parsing is not valid JSON).. details
  • Thanks a lot.. details
  • The very cool thing is that it's able to understand that you have contained arrays an parse it without troubles (I'm referring to your input).. details
  • Hey Thanks a lot.. details
  • I hope URL_http://nadacode.com/2010/06/30/using-json-in-your-google-app- engine-java-app/ [this] helps you can also the google-json api URL_http://code.google.com/p/google-gson/ [here] .. details
  • I hope URL_http://nadacode.com/2010/06/30/using-json-in-your-google-app- engine-java-app/ [this] helps you can also the google-json api URL_http://code.google.com/p/google-gson/ [here] .. details
  • URL_http://www.javacodegeeks.com/2011/01/android-json-parsing-gson- tutorial.html [Try-GSON--] And try to change your code design, hope it will help you.. details
  • Please Help!. details
  • Ok thank you very much matt :) It sounds like it's possible after all and that's all I wanted to know.. details
  • Ok thank you very much matt :) It sounds like it's possible after all and that's all I wanted to know.. details
  • If you've got some link to help me starting doing the thing it would be cool though ;) as I have to present a prototype of the procedure very soon (professional reason).. details
  • the value of _myArray_ is the same value as _jsonString_.. details
  • and both _jsonString_ and _myArray_ prnt: [{"id":"100002930603211","name":"Aardvark Jingleheimer","picture":"shortenedExample.jpg"},{"id":"537815695","name":"Aarn Mc","picture":"shortendExample.jpg"},{"id":"658471072","name":"Adrna opescu","picture":"shortenedExample.jpg"}] How can I convert this to an actual Java JSONArray**?. details
  • thanks!. details
  • It's so easy... to convert to JSon, simple use the toJson() method.. details
  • After working with both, I'd recommend Jerkson for its speed and support of streaming reads and writes, but both libraries should satisfy your use case.. details
  • After working with both, I'd recommend Jerkson for its speed and support of streaming reads and writes, but both libraries should satisfy your use case.. details
  • Do the same thing as this example for your Profile as well.. details
  • However I see several bugs there: Attributes is not a list, just an object, or at least that is what your json states CODETERM1 's field should be CODETERM2 , not CODETERM3 CODETERM4 attribute should be cap-cased in the class definition (if I look at the json) Otherwise your expectations of GSON seem fine and the code too.. details
  • GSONis easy to use and I seriously recommend it.. details
  • I need a Java object to get values of keys.. details
  • I tried to use Gson (but another easy solution would also be ok).. details
  • It should be 2, true, "list with records".. details
  • Thank you in advance... Best regards, Kai .. details
  • I used GSON and is perfect!!!!. details
  • I hope it helps!. details
  • I hope it helps!. details
  • I havnt been working on the class, since i tried printing out the output first, but i am unable to break it down further.. details
  • In which case i get: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT In the end, i want to loop through positions, creating class for each "positions", which contains a List with another class Position, which has the int x, y.. details
  • Thank you for your time.. details
  • First I send this JSON to the server using jQuery ajax method like this: CODESNIPPET_JAVA2 .. details
  • Now in the servlet I've learned that I should have been able to parse that JSON like this: CODESNIPPET_JAVA3 .. details
  • Correct way for parsing JSON objects containing arrays in Java Servlets (with Gson for example).. details
  • The Question I have is exactly what is the correct way (or best way, style wise) to parse this in a Java servlet (using GSON for example)?. details
  • I know this is a topic much talked about, but I still wasn't able to find a correct and clear answer to my specific problem.. details
  • I've got a JSON that looks like this: CODESNIPPET_JAVA1 .. details
  • And parsing the JSON from the request parameter name, like this: CODESNIPPET_JAVA6 .. details
  • Digging deeper I found that when looping over the request parameter names, it contained a parameter named "playerUIDs[]"** with the value of only 123** (the first int in the array).. details
  • Thanks in advance!. details
  • This was strange cause I didn't seem to be able to access the next values at all.. details
  • This was strange cause I didn't seem to be able to access the next values at all.. details
  • You can find Gson here - URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] This is easy to use.. details
  • when you retrieve the value, set these value to object's properties and then convert this object to json.. details
  • You can find Gson here - URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] This is easy to use.. details
  • You can find Gson here - URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] This is easy to use.. details
  • You can find Gson here - URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] This is easy to use.. details
  • GSON is simpler, jackson is faster.. details
  • if you have a simple flat model object with direct mapping to json, they are both brain dead simple.. details
  • GSON is simpler, jackson is faster.. details
  • you have two choices, a. if you want to stick with the standard org.gson libraries, you can write your own CODESNIPPET_JAVA1 .. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] It's very easy to integrate on your project and will ease a lot your work to parse the content of the json file.. details
  • I recommend you to use the Google's Gson library to work with JSON files.. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] It's very easy to integrate on your project and will ease a lot your work to parse the content of the json file.. details
  • Thanks.. details
  • I know this is a simple question, but I'm not finding anything to help me in the API, and I apparently don't know the terminology well enough for json to do searches good enough to find the answer.. details
  • I would recommend you to try URL_http://code.google.com/p/google-gson/ [gson] it worked like a magic for me.. details
  • I would recommend you to try URL_http://code.google.com/p/google-gson/ [gson] it worked like a magic for me.. details
  • The question is can it do it automatically by just passing it the object - like you can with the Google library - URL_http://code.google.com/p/google- gson/ [ URL_http://code.google.com/p/google-gson/ ] or do you need to construct the JSON manually by which I mean passing the individual properties to construct the JSON.. details
  • The question is can it do it automatically by just passing it the object - like you can with the Google library - URL_http://code.google.com/p/google- gson/ [ URL_http://code.google.com/p/google-gson/ ] or do you need to construct the JSON manually by which I mean passing the individual properties to construct the JSON.. details
  • But I'd really like to hear more about performance.. details
  • Great responses so far.. details
  • But I'd really like to hear more about performance.. details
  • Well with gson it just said it couldn't deser' it.. details
  • What do you think would be the best way to get those sub-arrays for the image here?. details
  • Say I have a JSON string like: CODETERM1 .. details
  • i hope it's now more clear:) .. details
  • I think should be something like: CODESNIPPET_JAVA2 .. details
  • These are the two classes I have defined (each class contains the respective getters and setters): CODESNIPPET_JAVA2 .. details
  • This is what I have done: To parse the total, page, and pagesize, I used (and worked fine): CODESNIPPET_JAVA3 .. details
  • uses URL_http://www.playframework.org/documentation/1.2.4/controllers#pojo [POJO- binding] it's probably better to do something like: CODESNIPPET_JAVA1 .. details
  • it may be worth adding the stacktrace you get.. details
  • Can someone please give me some options?. details
  • Check URL_http://code.google.com/p/google-gson/ [Gson] , it is a very simple google API .. details
  • Check URL_http://code.google.com/p/google-gson/ [Gson] , it is a very simple google API .. details
  • add Gson element in the correct place to file on disk .. details
  • my question is this: I need to add an element in an array Gson saved to a file on disk.. details
  • When I do that, I wait for something like this: [{object1},{object2},{object3}] But I got it here:[{object1}][{object2}] Can anyone tell me how can I add a new object GSON to the file to disk so that the structure remains correct?. details
  • Explaining: I add an object of type DirectoryMap in a ArrayList, convert it to JSON (using Gson) and saved to disk.. details
  • thanks.. details
  • then is simple for you to deserialize the json via gson to you classes: CODESNIPPET_JAVA2 .. details
  • And there's a lot of other nifty things you can do: URL_https://sites.google.com/site/gson/gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] Oh forgot one important thing!. details
  • I'd like to create a method that implements some methods from the CODETERM1 library to loaded some settings Objects.. details
  • Basically, I have a bunch of different settings objects but I don't want to habe to override the load method for each class to I'd like to have something like: CODESNIPPET_JAVA1 .. details
  • Previously I have used GSON to do that, but now I am faced with a project that already depends on Jackson and I would prefer not to introduce new dependency if I can do with what I already have at hand.. details
  • I have used both Jackson and Gson for the JSON support with RESTEasy and it is quite simple.. details
  • I have used both Jackson and Gson for the JSON support with RESTEasy and it is quite simple.. details
  • Thanx a bunch!. details
  • Note that for arrays there are repeating values (i.e.. details
  • I'd tried numerous configuration, including remove the extended class and put all the id and name in the respective classes but the result is still the same.. details
  • I have a JSON string that i need to deserialize into objects representing the JSON structure, the JSON string is something like below: CODESNIPPET_JAVA1 .. details
  • I'm working on a project in Android.. details
  • The number of object count in the parents list is correct (i.e.. details
  • I accepted your answer because I found it much easier to handle the native Android JSONObject than the Google GSONObject and am now using that.. details
  • I would really appreciate adices/ help/ messages/ :-) Thanks.. details
  • 2. reduce the JSON file by splitting this file into many other: but I did not find any good Java API for this.. details
  • 2. reduce the JSON file by splitting this file into many other: but I did not find any good Java API for this.. details
  • I would really appreciate adices/ help/ messages/ :-) Thanks.. details
  • I gave up on GSON and switched to JACKSONit works perfectly for extracting the data of interest and ignoring everything else.thanks for all the time spent in responding to my question .. details
  • Hmmmm this doesn't quite work but maybe you can explain or hint at this.. What exactly do the < mean and what is that called?. details
  • I can find enough info to understand with the right terms :).. details
  • I have been looking all over these and I cant find anything that explains how to name or iterate through objects with numeric names like in the json above... details
  • But the Java side DataTable has different names for the parameters, and I am using Gson which has different type values: CODESNIPPET_JAVA2 .. details
  • (does not have to be this particular annotation, but this seemed the most sensible) I am looking for something that works like Gson's @Expose annotation and GsonBuilder().excludeFieldsWithoutExposeAnnotation().create() serializer URL_http://google-gson.googlecode.com/svn/tags/1.7/docs/javadocs/com/google/gs on/annotations/Expose.html [Example] .. details
  • Thanks, Ransom .. details
  • If you want to do JSON instead, I'd strongly recommend using GSON.. details
  • Thanks in advance .. details
  • And can i use a HashMap like this with GSON?. details
  • However i'd like to create the User and the Profile out of this Json, but i got this Exception: //EDIT: I removed the CODETERM1 from Profile and User.. details
  • However i'd like to create the User and the Profile out of this Json, but i got this Exception: //EDIT: I removed the CODETERM1 from Profile and User.. details
  • is it possible to parse the json response returned by the Freebase experimental TOPIC Api with the google gson library?i have used gson to parse the json repsone from multiple freebase mqlread responses.i am now stuck attempting to parse json messages like the response from this URL_http://api.freebase.com/api/experimental/topic/basic?id=/en/sgt_peppers_lo nely_hearts_club_band [ URL_http://api.freebase.com/api/experimental/topic/basic?id /en/sgt_peppers_lonely_hearts_club_band] or from this URL_http://api.freebase.com/api/experimental/topic/basic?id=/en/please_please_ me,/en/sgt_peppers_lonely_hearts_club_band [ URL_http://api.freebase.com/api/experi mental/topic/basic?id=/en/please_please_me,/en/sgt_peppers_lonely_hearts_club_ band] or this URL_http://api.freebase.com/api/experimental/topic/standard?id=/guid/9202a8c04 000641f800000000de75560&domains=all [ URL_http://api.freebase.com/api/experimental / topic/standard?id=/guid/9202a8c04000641f800000000de75560&domains=all] is it possible to parse all three repsones with one gson "code set" .. details
  • is it possible to parse the json response returned by the Freebase experimental TOPIC Api with the google gson library?i have used gson to parse the json repsone from multiple freebase mqlread responses.i am now stuck attempting to parse json messages like the response from this URL_http://api.freebase.com/api/experimental/topic/basic?id=/en/sgt_peppers_lo nely_hearts_club_band [ URL_http://api.freebase.com/api/experimental/topic/basic?id /en/sgt_peppers_lonely_hearts_club_band] or from this URL_http://api.freebase.com/api/experimental/topic/basic?id=/en/please_please_ me,/en/sgt_peppers_lonely_hearts_club_band [ URL_http://api.freebase.com/api/experi mental/topic/basic?id=/en/please_please_me,/en/sgt_peppers_lonely_hearts_club_ band] or this URL_http://api.freebase.com/api/experimental/topic/standard?id=/guid/9202a8c04 000641f800000000de75560&domains=all [ URL_http://api.freebase.com/api/experimental / topic/standard?id=/guid/9202a8c04000641f800000000de75560&domains=all] is it possible to parse all three repsones with one gson "code set" .. details
  • I'm using GSON: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] for parsing JSON, It is very easy to use: CODESNIPPET_JAVA1 .. details
  • I'm using GSON: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] for parsing JSON, It is very easy to use: CODESNIPPET_JAVA1 .. details
  • for more examples please look here: URL_https://sites.google.com/site/gson /gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] .. details
  • Google-GSon is also popular, and you can see how some people compare the two in this URL_http://stackoverflow.com/questions/2378402/jackson-vs-gson [question] .. details
  • Google-GSon is also popular, and you can see how some people compare the two in this URL_http://stackoverflow.com/questions/2378402/jackson-vs-gson [question] .. details
  • That being said, with the current state of Java XML support, you should find XML equally accessible.. details
  • That being said, with the current state of Java XML support, you should find XML equally accessible.. details
  • I doubt that works.. details
  • Keep in mind that this is only a command line program to _demonstrate_ how it works, but the same principles apply within the Android environment (referencing jar libs, etc.). details
  • I just ended up making my life simpler by creating a Java object that the JSON could be convert into and used URL_http://code.google.com/p/google-gson/ [CODETERM1] to do the conversion.. details
  • I just ended up making my life simpler by creating a Java object that the JSON could be convert into and used URL_http://code.google.com/p/google-gson/ [CODETERM1] to do the conversion.. details
  • This may be what you are looking for URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] Cheers .. details
  • and in activity, I have made an array of dataObject, say dataObject x[5]; Now i want to pass these 5 dataObject to my javascript webView interface as JSON in a callback function.. details
  • Currently I am working on a native android app with webView front end.. details
  • I have something like: CODESNIPPET_JAVA1 .. details
  • I looked through the internet, seems like most tutorials talk about how to convert fromJson().. details
  • I am pretty new to this.. details
  • Thanks .. details
  • From the code for GSON Code for DateTypeAdapter, it handles JSONNull objects fine, it just skips over them.. details
  • The function call data.getResult() gives back the value "null".. details
  • My code, where I'm trying to deserialize the object with GSON from Google looks like this.. details
  • Happy coding!. details
  • CODETERM7 is needed, because I saw the attributes with nullvalues are also serialized like CODETERM8 .. details
  • I have a json string like this: URL_http://pastebin.com/ckUZadwL [ URL_http://pastebin.com/ckUZadwL ] I'm trying to use gson to parse them.. details
  • Thank you for your help.. details
  • last time i checked gson doesn't handle circular references.. though an update could've fixed that.. i find the [link] URL_http://jackson.codehaus.org / the best.. details
  • gson can handle generics very well.. details
  • GSON (which I've stuck with so far) does not until URL_http://code.google.com/p/google- gson/issues/detail?id=231 [issue-231] is resolved.. details
  • That is, the JSON value.. details
  • Please edit your question and tell us what does answer.toString() returns.. details
  • @Ajka It's open source.. details
  • @Ajka It's open source.. details
  • for example it will be like this URL_http://gdata.youtube.com/feeds/api/videos/SIFL9qfmu5U?alt=jsonor from facebook graph.. details
  • I highly recommend using Gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] It's relatively painless .. details
  • I highly recommend using Gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] It's relatively painless .. details
  • have been looking at the documentation but it's no clear about this.. details
  • Does anybody has an example of how could we deserialize a collection by using Gson?.Thanks a lot.. details
  • Use a library like Jackson or GSON to deserialize the json to instances of your classes.. details
  • I have used simple JSON strings by now, but in this case I can't remake the structure of the class I need.. details
  • Any help is appreciated.. details
  • Basically in the end I need something like CODETERM1 where CODETERM2 has all the attributes from the json string.. details
  • Thank you.. details
  • At first, I tried to write a general custom type adaptor for Integer values, to catch the CODETERM1 and return 0, but Gson doesn't allow TypeAdaptors for primitive Types: CODESNIPPET_JAVA1 .. details
  • I'm reading a JSON response with URL_http://code.google.com/p/google-gson/ [Gson] , which returns somtimes a CODETERM1 because an expected CODETERM2 value is set to an empty string.. details
  • The java class looks like this: CODESNIPPET_JAVA3 .. details
  • I'm reading a JSON response with URL_http://code.google.com/p/google-gson/ [Gson] , which returns somtimes a CODETERM1 because an expected CODETERM2 value is set to an empty string.. details
  • The java class looks like this: CODESNIPPET_JAVA3 .. details
  • If the value is an empty string, the deserialization should be 0.. details
  • If the value is an empty string, the deserialization should be 0.. details
  • Which throws a CODETERM3 because an empty String is returned instead of an int value.. details
  • Now I'm wondering what's the best way to handle this kind of exception.. details
  • Which throws a CODETERM3 because an empty String is returned instead of an int value.. details
  • Some deserializer supports deserialization mechanism via annotation (which seems that you are using).. details
  • Theorically is not a valid JSON string but Gson supports " and ' and no quotes, like many other parsers.. details
  • Also Javascript supports simple quotes and no quotes :)See URL_http://sites.google.com/site/gson/gson-user-guide TOC Serializing-and-Deserializing-Colle.. details
  • Also Javascript supports simple quotes and no quotes :)See URL_http://sites.google.com/site/gson/gson-user-guide TOC Serializing-and-Deserializing-Colle.. details
  • could you post some parsing code?, looks like you are trying to read jsonArray on jsonObject.. details
  • Thanks.. details
  • Alternatively, ditch the type safety of your top-level object and just use hashmaps and arrays all the way down.. details
  • Hope this help.. details
  • JSON - deserialization of dynamic object using Gson.. details
  • The CODETERM1 JSON is given to me from some other application and I don't ever know what are it's parameter names, since they are dynamic.. details
  • Thanks .. details
  • Although your proposed gson solution works when you create the type by another gson instance, it does not work when reusing the same context.. details
  • Lets say i have a JSON like: CODESNIPPET_JAVA1 .. details
  • I have a correctly set up Javabean and can access id without problems.. details
  • I'm uncertain whether Gson can allow for that recursive structure, but I believe Maps will solve the dynamic key issue you are asking about.. details
  • As for the json: there are libraries like URL_http://code.google.com/p/google- gson/ [gson] that allow you to convert beans to json and back.. details
  • +1 for JohnS's gson answer, but here's a way with the "standard" JSONObject library: CODESNIPPET_JAVA1 .. details
  • If you're realizing a small project Gson is the best solution for parsing.. details
  • You might look at "document databases" (so-called URL_http://en.wikipedia.org/wiki/NoSQL [NoSQL] ) rather than SQL ones if you're allowed to, as they usually allow the schema to be more fluid.. details
  • Your first step will be to parse the JSON to get an object graph, using a library like URL_http://code.google.com/p/google-gson/ [gson] or any of several others.. details
  • You might look at "document databases" (so-called URL_http://en.wikipedia.org/wiki/NoSQL [NoSQL] ) rather than SQL ones if you're allowed to, as they usually allow the schema to be more fluid.. details
  • Your first step will be to parse the JSON to get an object graph, using a library like URL_http://code.google.com/p/google-gson/ [gson] or any of several others.. details
  • [1]: URL_http://stackoverflow.com/questions/1723168/what-is-the-fastest-or-most - elegant-way-to-compute-a-set-difference-using-javascr/1723220#1723220.. details
  • [1]: URL_http://stackoverflow.com/questions/1723168/what-is-the-fastest-or-most - elegant-way-to-compute-a-set-difference-using-javascr/1723220#1723220.. details
  • It looks like most of Android developers write their own implementations based on Apache HTTP client + GSON or org.json.. details
  • Try URL_http://code.google.com/p/google-gson/ [Gson] , it works better than JSONObject library.. details
  • Try URL_http://code.google.com/p/google-gson/ [Gson] , it works better than JSONObject library.. details
  • If your JSON data does not follow a specific structure, don't use GSON, but a regular JSON library (like the one from URL_http://json.org/ [json.org] ) that will give you an instance of a class like CODETERM1 , from which you can access data like CODETERM2 .. details
  • Instead of using a JSONContainer like I did, I think the best way is to go with Collection as shown in this user guide for GSON made by Google (the JSON mapper used by Play apparently) at URL_http://sites.google.com/site/gson/gson- user-guide#TOC-Collections-Examples [ URL_http://sites.google.com/site/gson/gson - user-guide#TOC-Collections-Examples] : CODESNIPPET_JAVA1 .. details
  • Instead of using a JSONContainer like I did, I think the best way is to go with Collection as shown in this user guide for GSON made by Google (the JSON mapper used by Play apparently) at URL_http://sites.google.com/site/gson/gson- user-guide#TOC-Collections-Examples [ URL_http://sites.google.com/site/gson/gson - user-guide#TOC-Collections-Examples] : CODESNIPPET_JAVA1 .. details
  • Collection are good for serializing (Java object to JSON) but not good for deserializing (see the GSON user guide for more insight).. details
  • Gson 1.7.1 and 2.0 both respect final field assignments during vanilla deserialization operations, and the initial final field assignments are not altered.. details
  • Cool and that works, but it seems like so much overhead (**_a whole Type Adapter class?_**).. details
  • Gson: Is there an easier way to serialize a map.. details
  • Or if I have a custom class something like the following: CODESNIPPET_JAVA3 .. details
  • Or if I have a custom class something like the following: CODESNIPPET_JAVA3 .. details
  • I have used other JSON libraries like JSONLib and they let you build a map in the following way: CODESNIPPET_JAVA2 .. details
  • URL_http://code.google.com/p/google-gson/issues/detail?id=45 [This] link from the Gson project seems to indicate that I would have to do something like the following for serializing a typed Map to JSON: CODESNIPPET_JAVA1 .. details
  • I have used other JSON libraries like JSONLib and they let you build a map in the following way: CODESNIPPET_JAVA2 .. details
  • URL_http://code.google.com/p/google-gson/issues/detail?id=45 [This] link from the Gson project seems to indicate that I would have to do something like the following for serializing a typed Map to JSON: CODESNIPPET_JAVA1 .. details
  • 'name' in Screen is set correctly, 'name' in AWidget stays null.. details
  • I like URL_http://code.google.com/p/google-gson/ [google-gson] library.. details
  • I like URL_http://code.google.com/p/google-gson/ [google-gson] library.. details
  • This is very easy to do using Google's GSON library.. details
  • The sixth part of the series provides easy navigation links for the comparison, as well as a summary comparison listing.. details
  • Any help in this regard will be helpful.. details
  • Any help in this regard will be helpful.. details
  • For a short example, I try to retrieve Timestamp with this code, but it gives me a null value CODESNIPPET_JAVA2 .. details
  • If you would prefer to change the default representation, you can do so by registering a type adapter through GsonBuilder.registerTypeAdapter(Type, Object).. details
  • My class now looks like: CODESNIPPET_JAVA2 .. details
  • Alternatively, you could annotate the CODETERM4 field with an CODETERM5 to tell gson to use the value from the CODETERM6 field in the JSON as the value for the CODETERM7 field in your Java object.. details
  • I have defined my 2 classes like: CODESNIPPET_JAVA2 .. details
  • Why not create a class like this : CODESNIPPET_JAVA1 .. details
  • GSON is really simple to use and if performance isn't an issue, it's quite nice.. details
  • As I've said in URL_http://stackoverflow.com/questions/8087094/light-and-fast-android-json- parser/ [the-past] in another related SO question, I've gotten huge performance gains (when working with large sets of JSON) by simply switching to Jackson from GSON.. details
  • GSON is really simple to use and if performance isn't an issue, it's quite nice.. details
  • As I've said in URL_http://stackoverflow.com/questions/8087094/light-and-fast-android-json- parser/ [the-past] in another related SO question, I've gotten huge performance gains (when working with large sets of JSON) by simply switching to Jackson from GSON.. details
  • If anyone else knows of other JSON to/from libraries that can cope with this case then please let me know.. details
  • Update As promised I'm back but not with Gson, instead with Jackson 2.. details
  • With this kind of cursors (a.k.a.. details
  • Check about your favourite DBMS.. details
  • (I highly recommend abandoning Gson in favor of Jackson, whenever possible.). details
  • where br it's a buffered reader that contains buffer of requested web page.Parsing of key_1 and key_2 works fine but parsing of key_3 downs' work.Have you a suggestion?. details
  • Thanks!. details
  • Personally I'd suggest you skip the clever object binding stuff and look at the URL_http ://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [CODETERM1] class instead.. details
  • The downside is you need to write a bit more code to encode your JSON, but I think that's a worthy trade-off when working on a constrained mobile platform.. details
  • Then go from object to string like this: CODESNIPPET_JAVA2 .. details
  • Then, in your http connection you want to set the request entity like this: CODESNIPPET_JAVA3 .. details
  • Then, in your http connection you want to set the request entity like this: CODESNIPPET_JAVA3 .. details
  • Then go from object to string like this: CODESNIPPET_JAVA2 .. details
  • I found Gson to be the easiest to work with custom objects.. details
  • I know GSON or JSONObject will be nice for JSON producing but what about XML?. details
  • GSON has a pretty good test case here showing how to define and register a type hierarchy adapter.. details
  • URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/test/jav a/com/google/gson/functional/TypeHierarchyAdapterTest.java?r=739 [ URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/test/java/c om/google/gson/functional/TypeHierarchyAdapterTest.java?r=739] To use that do this: CODESNIPPET_JAVA1 .. details
  • URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/test/jav a/com/google/gson/functional/TypeHierarchyAdapterTest.java?r=739 [ URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/test/java/c om/google/gson/functional/TypeHierarchyAdapterTest.java?r=739] To use that do this: CODESNIPPET_JAVA1 .. details
  • There's an URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Array- Examples [array-example] to get you started, as well as a URL_https://sites.google.com/site/gson/gson-user-guide [ton-of-others-in-the- user-guide] .. details
  • Generics will give you the benefits of compile time type safety, so yes, it probably is better if you will know what types to use this method on.. details
  • It would appear that the best option is to the @Expose ( CODETERM1 ) annotation to mark the fields that you want to be serialised by Gson.. details
  • But if I render a JSONContainer object like this: CODETERM2 how can I pass the serializer classes to the rendering method?. details
  • I was able to successfully parse the below JSON string in Android using JSONObject and JSONArray.. details
  • Have had no success achieving the same result with GSON or Jackson.. details
  • So I'm hoping they deliver that because I really need it.. details
  • GSON does an excellent job of serializing (converting object to json) complex objects with basically no changes or thought at all on your part, but is a bit slow and memory intensive.. details
  • Some may only look at public variables in your classes or just call on public methods that look like getters/setters.. details
  • GSON does an excellent job of serializing (converting object to json) complex objects with basically no changes or thought at all on your part, but is a bit slow and memory intensive.. details
  • Well sometimes performance and usability can be at odds, but I've found GSON to be easier to use than alternatives like URL_http://jackson.codehaus.org/Home [Jackson] , URL_http://json.org/java/ [org.json] and others.. details
  • That being said, I have tailored my JSON to be more suitable for serialization, but overall GSON has been great.. details
  • Well sometimes performance and usability can be at odds, but I've found GSON to be easier to use than alternatives like URL_http://jackson.codehaus.org/Home [Jackson] , URL_http://json.org/java/ [org.json] and others.. details
  • But if you just need to send and recieve a simple json object, the native library does the trick quite respectably.. details
  • You might be able to create classes at runtime by parsing the Json string, but I don't know whether that would be worth the hassle.. details
  • If everything is dynamic your best bet would be to deserialize the Json string to maps of strings or arrays etc.. details
  • like other Json libraries do (I don't know whether Gson can do this as well, but the classes you need are commonly called CODETERM1 and CODETERM2 ).. details
  • Constructing POJO out of JSON string with dynamic fields using Gson.. details
  • How would I construct a POJO for Gson to deserialize to when all of the fields are dynamic?. details
  • An example would look like this: CODESNIPPET_JAVA1 .. details
  • Thanks @doc_180 already found it.. details
  • It works fine, but i don't want to transfer the whole Tree.. details
  • but want to have links like: CODESNIPPET_JAVA3 .. details
  • If anyone have another solution, it's welcome.. details
  • Serializing an instance of BookStore would lead to something like: CODESNIPPET_JAVA2 .. details
  • Remember that erasure is URL_http://www.angelikalanger.com/Gener icsFAQ/FAQSections/TechnicalDetails.html#FAQ101 [replacing-type-parameters-by- their-leftmost-bound] and that a URL_http://gafter.blogspot.com/2006/12/super- type-tokens.html [super-type-token] (which is what that TypeToken is, as used in Guice & Gson and various other places) is basically a trick that lets you get access to the parameterized type information of the superclass via reflection.. details
  • If I do that and call it like so CODESNIPPET_JAVA4 .. details
  • This is what the method looks like now (it only works for Creatures): CODESNIPPET_JAVA3 .. details
  • I was trying to do something like this, but couldn't get it to work.. details
  • An example of the above helped me, I'm right understand that i can get exact key: value from my class in json?. details
  • Thank you for your reply!. details
  • Gson can deserialize to instances of inner classes very easily, without custom processing to explicitly handle the enclosing class instantiation -- Gson will take care of it.. details
  • It also depends on your views or needs, some would like to have domain objects, and have GSON map the data for them, some would rather have generic objects like JSONObject.. details
  • Hi Eamorr, the "beauty" of GSON is the boiler code that you need not write to be able to map data from your JSON string to your domain object (Car, Bus, Person).. details
  • It also depends on your views or needs, some would like to have domain objects, and have GSON map the data for them, some would rather have generic objects like JSONObject.. details
  • Thank you so much!. details
  • Hey, thanks for the response.. details
  • +1 I've recently incorporated gson into my project... it rocks.. details
  • You can use Google-gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] , it's quite good for converting Java beans to json: URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Object-Examples] .. details
  • You can use Google-gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] , it's quite good for converting Java beans to json: URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Object-Examples] .. details
  • You can use Google-gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] , it's quite good for converting Java beans to json: URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Object-Examples] .. details
  • You can use Google-gson: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] , it's quite good for converting Java beans to json: URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Object-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Object-Examples] .. details
  • Is this the kind of thing you're after?. details
  • The result will be a CODETERM1 with CODETERM2 keys and either CODETERM3 or CODETERM4 values.. details
  • Serialize that map back to JSON like this: CODESNIPPET_JAVA2 .. details
  • I'm pleased to report that with GSON 2.0** supports default maps and lists without effort.. details
  • We hope to release GSON 2.0 in October 2012.. details
  • I'm finding it to be as easy as Gson, while offering more configuration options, doing things that Gson does not do, and doing them faster.. details
  • I'm finding it to be as easy as Gson, while offering more configuration options, doing things that Gson does not do, and doing them faster.. details
  • It seems that it is easier than GSON.. details
  • If a solution for issue 325 were implemented, this would be easy URL_http://code.google.com/p/google-gson/issues/detail?id=325 .. details
  • If a solution for issue 325 were implemented, this would be easy URL_http://code.google.com/p/google-gson/issues/detail?id=325 .. details
  • This looks good.. details
  • Thank you.. details
  • Though you have chosen to use Gson (a good decision).. details
  • URL_http://code.google.com/p/google-gson/ [Google-Gson] is very popular.. details
  • URL_http://code.google.com/p/google-gson/ [Google-Gson] is very popular.. details
  • I have myself not used it with Generics but their front page says Gson considers support for Generics very important.. details
  • I've used Gson with some good success: URL_http://code.google.com/p/google- gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • I've used Gson with some good success: URL_http://code.google.com/p/google- gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • can someone please help me parse my Json string to JsonObject?. details
  • Thanks a lot :) Edit: I finally have the answer..it's because due to the JSON structure..I have to put it into a JSONObject first, like so CODESNIPPET_JAVA3 .. details
  • Then I would deserialize like CODESNIPPET_JAVA4 .. details
  • Thanks, right now I saw 4 solutions - spring-json, jackson (delivered with Spring-MVC), FlexJson (delivered with SpringRoo) and gson... After few hours of play with first 3 of them i found that FlexJSON is fastest in setting up, spring-json has best docs and Spring-mvc jackson has working samples on spring svn.. details
  • Note that with a solution like this, it's not necessary to also "manually" deserialize the Person objects, since there is nothing about Person that requires custom handling.. details
  • visitPrimitive performs the proper action by placing the parsed value into the target variable which would be passed back.. details
  • Since the value is of type Object your call to fromJson(), the class com.google.gson.ObjectNavigator will be used and comes into this section of code [~line 113] CODESNIPPET_JAVA1 .. details
  • so when the getTarget() method is called, it checks to see if the constructed flag is true, if not it creates a new instance of the object you are trying to create.. details
  • I would recommend filing this as a report on the Gson forums.There is already URL_http://code.google.com/p/google-gson/issues/detail?id=234 [one- report-filed] for version 1.5 Work Around** I see two ways you can fix this in the short term.. details
  • I would recommend filing this as a report on the Gson forums.There is already URL_http://code.google.com/p/google-gson/issues/detail?id=234 [one- report-filed] for version 1.5 Work Around** I see two ways you can fix this in the short term.. details
  • where visitor is of type JSonObjectDeserializationVisitor, objectToVisit is your value and objectTypePair is the type it is to become (Object).. details
  • A comment on issue 232 includes the possible changes necessary to enable getter support.. details
  • Some future version of Gson will reportedly support using getters/setters instead of fields.. details
  • Everything seems to work fine but when I'm trying to parse a more "complexed" object I'm getting a deserialization error.. details
  • Everything seems to work fine but when I'm trying to parse a more "complexed" object I'm getting a deserialization error.. details
  • I've used it and it's really good.. details
  • I've used it and it's really good.. details
  • I used Gson I can't find any helpful examples.. details
  • It was easier when I did it all myself using strings, and GSON.. details
  • (For the interested: The underlying implementation that provides for this feature stores added elements using a LinkedHashMap.. details
  • The example Egg class that I used is probably not complete enough for purposes other than Gson serialization/deserialization.. details
  • Most also do not fully support the use of Java Generics.. details
  • I prefer Google's GSON library for dealing with JSON.. details
  • GSon uses reflections to set properties, so make sure you have setters for all properties in json, like setName, setEmail, setFriends, ... details
  • But i wanted the o/p to be like: CODESNIPPET_JAVA5 .. details
  • What should be added in above codes, can you please advice?. details
  • Thanks .. details
  • Please don't hesitate to vote for its implementation at code.google.com/p/google- gson/issues/detail?id=325.. details
  • Gson issue 325 addresses simple deserialization to Map.. details
  • Gson issue 325 addresses simple deserialization to Map.. details
  • Please don't hesitate to vote for its implementation at URL_http://code.google.com/p/google - gson/issues/detail?id=325.. details
  • It's fantastic when deserialization takes just two or three lines of code, which is entirely possible and very common when using APIs like Gson or Jackson.. details
  • It's fantastic when deserialization takes just two or three lines of code, which is entirely possible and very common when using APIs like Gson or Jackson.. details
  • try using Google's GSON library, its awesome!.. details
  • Take a look at URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Object-Examples [ URL_https://sites.google.com/site/gson/gson-user-guide TOC Object-Examples] I like Gson because it comes with Play!. details
  • out of the box.You can build your own, adapter, something like: CODESNIPPET_JAVA1 .. details
  • Gson would just create plain old Object instances for the Map values -- not from subclasses of Object like String or Integer, but just Objects.. details
  • Note that HashMap does not include enough type information for Gson to deserialize to.. details
  • Thanks in advance!. details
  • Please help how i should handle this scenario.. details
  • Thanks.. details
  • Also, you mentioned you've been looking at other 3rd party libraries to do this as well.. details
  • Also, you mentioned you've been looking at other 3rd party libraries to do this as well.. details
  • Feel free to edit your question or comment and ask for more specific information.. details
  • You have to keep in mind that if you're using google app engine, something that works locally might not work when you deploy it.. details
  • And, for what its worth, I did a small smoke test of GSON in app engine and it seemed to work fine.. details
  • You have to keep in mind that if you're using google app engine, something that works locally might not work when you deploy it.. details
  • Thanks for any help .. details
  • Some sample code would be awesome.. details
  • Is there a good way of doing this ?. details
  • I'm using GSON on my Java EE server to provide some json to views.In some object, I have long text, that can contains anything (like 'What a "great" news!').. details
  • But I need to do it with Jackson now, since Gson doesn't have support for interfaces.. details
  • +1 I use Google's GSON and it works amazingly, as expected from Google.. details
  • Instead of using org.json's barebones library as suggested already, consider using data-binding JSON library like URL_http://jackson.codehaus.org [Jackson] or URL_http://code.google.com/p/google-gson/ [GSON] (there are many others as well), in which case you can simplify servlet case (with Jackson) to: new ObjectMapper().writeValue(response.getOutputStream(), array); and that's all you need.. details
  • Instead of using org.json's barebones library as suggested already, consider using data-binding JSON library like URL_http://jackson.codehaus.org [Jackson] or URL_http://code.google.com/p/google-gson/ [GSON] (there are many others as well), in which case you can simplify servlet case (with Jackson) to: new ObjectMapper().writeValue(response.getOutputStream(), array); and that's all you need.. details
  • Json Object could be retrieve like this : CODESNIPPET_JAVA2 .. details
  • And your instruction are simple.. details
  • GSON from google : URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] , or Jackson the library used in spring : URL_http://jackson.codehaus.org/ [ URL_http://jackson.codehaus.org/ ] and I would concur with others suggesting jaxb for XML to pojo, well supported lots of tools : its the standard.. details
  • URL_http://stackoverflow.com/questions/5845822 /gson-deserializing-key-value-to-custom-object.. details
  • gson looks to be more up to date and robust.. details
  • gson looks to be more up to date and robust.. details
  • @krio, thats fine, but i would go with kevins answer.. details
  • Thanks for the answer however I am choosing second answer to be be more acceptable how ever your answer made my understanding more clear about Gson...cheers.. details
  • Thanks, that was really helpful.. details
  • I know to parse when names doesn't have space between, I create class like CODESNIPPET_JAVA2 .. details
  • How to parse with GSON when file looks like this CODESNIPPET_JAVA1 .. details
  • But thanks for the two recommendations.. details
  • But thanks for the two recommendations.. details
  • I looked google's Gson and Json but could not find any sample to find a node and get the value like I do in C# dataset or xpath.. details
  • Thanks for your help.. details
  • URL_http://code.google.com/p/google-gson/ [Gson] makes what you're trying to do relatively easy.. details
  • URL_http://code.google.com/p/google-gson/ [Gson] makes what you're trying to do relatively easy.. details
  • -Is there performance overhead if constantly casting Objects to whatever kind of object is passed to the method?. details
  • -Is there performance overhead if constantly casting Objects to whatever kind of object is passed to the method?. details
  • eg something like this... CODESNIPPET_JAVA2 .. details
  • There is some documentantion URL_http://sites.google.com/site/gson/gson-user- guide#TOC-Serializing-and-Deserializing-Gener [here] which looks like it is close to what I need however it doesn't cover my case.. details
  • This works well, however when the class extends eg Vector< String then the fields are missing from the output.. details
  • Required/Expected output:**I would like both the contents of the new object's fields to be displayed as well as the contents of the Vector I'm extending.. details
  • Required/Expected output:**I would like both the contents of the new object's fields to be displayed as well as the contents of the Vector I'm extending.. details
  • eg something like this... CODESNIPPET_JAVA2 .. details
  • If this does not work, then you could use other serialization mechanism like Jackson or Gson.. details
  • ya to parse json is quite complex, but with the help of Gson it is very easy dear.. details
  • I have added gson to my resources and have been looking at examples, but haven't found a simpler way to do this without gson.. details
  • Thank you but I would like to do this without gson.. details
  • Thank you but I would like to do this without gson.. details
  • Nailed it, this worked flawlessly.. details
  • Thanks so much.. details
  • As already suggested, a simple approach would be to use Gson to deserialize the JSON into a Java data structure, and then iterate through the Java structure to select the target data.. details
  • At any rate, whether using Gson or any other Java-to/from-JSON library, you'd do well to decide on selection criteria other than line number.. details
  • Assuming that the selection goal includes the URLs of the first two backdrops with size w1280, following is an example of using Gson to accomplish it.. details
  • Another way is the use of regular expression but it could take much more memmory.I think the most efficient way will be writing own loop-based logic :/ .. details
  • With Gson, here's what that solution would look like.. details
  • The two best options that I know of are: URL_http://jackson.codehaus.org/ [Jackson] URL_http://code.google.com/p/google-gson/ [gson] Using them is a matter of calling one method of the mapper.. details
  • The two best options that I know of are: URL_http://jackson.codehaus.org/ [Jackson] URL_http://code.google.com/p/google-gson/ [gson] Using them is a matter of calling one method of the mapper.. details
  • With Gson, here's one simple approach you could take.. details
  • Here's what that would look like.. details
  • Here's one simple approach using Gson.. details
  • Can anyone please point me in the right direction?. details
  • Many thanks in advance, .. details
  • The same can be accomplished with Gson, but it requires a few more lines of code.. details
  • Thanks for any help and/or suggestions!. details
  • Thanks for any help and/or suggestions!. details
  • Thanks for any help!. details
  • I recommend that you to have a look at GSon.. details
  • I recommend that you to have a look at GSon.. details
  • It's great; quick and efficient.. details
  • It's great; quick and efficient.. details
  • I would advise you to look at more modern JSON libraries like Gson or Jackson, because they make life a lot simpler!. details
  • I've used it , and it works!. details
  • I've used it , and it works!. details
  • Thanks, but where is the merge here?. details
  • i want to reduce steps all in one like gson.fromJson(strxml,MyJavaBean.class);.. details
  • Thanks in advance for your help.. details
  • Jackson doesn't currently have any built-in JSON versioning support, like URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Versioning-Support [Gson-does] .. details
  • The approach I would take would be to implement a custom JSON versioning support solution, similar to how Gson does it.. details
  • Then logic in your Java bean processing could be relatively straightforward regarding handling different versions either post-deserialization, or during custom deserialization.. details
  • Please don't hesitate to vote for its implementation.. details
  • Gson does not currently have a simple mechanism for polymorphic deserialization, other than implementing custom deserialization processing.. details
  • Sounds like you want to create a URL_https://sites.google.com/site/gson/gson- user-guide#TOC-Custom-Serialization-and-Deserializ [custom-deserializer] if you need to check the values, or an URL_https://sites.google.com/site/gson /gson-user-guide#TOC-Writing-an-Instance-Creator [instance-creator] if you only need to create an instance based on type.. details
  • That is have a generic QueryValue class, but have the correct subclass returned depending on the parameters that the JSON supplies.. details
  • That is have a generic QueryValue class, but have the correct subclass returned depending on the parameters that the JSON supplies.. details
  • If GSON does support definition of field order, there are other libraries that do.. details
  • Now, my problem is that when I deserialize, using CODETERM1 , without the CODETERM2 element, everything is good, but I get a CODETERM3 when I include the contained list.. details
  • Now, my problem is that when I deserialize, using CODETERM1 , without the CODETERM2 element, everything is good, but I get a CODETERM3 when I include the contained list.. details
  • I've read about how to deal with collections of generic types and the use of CODETERM4 , but I can't apply this knowledge when my collection is part of another class I really would appreciate any help to solve this.. details
  • I have some difficulties with json deserialization using GSon and I hope somebody can help me.. details
  • I've read about how to deal with collections of generic types and the use of CODETERM4 , but I can't apply this knowledge when my collection is part of another class I really would appreciate any help to solve this.. details
  • Specific to the question asked, here's a working solution.. details
  • Gson allows for one of the simplest possible solutions.. details
  • Parsing Gson with Json not working for Android.. details
  • I have a web service class that successfully pulls my JSON from a feed into a CODETERM1 .. details
  • The issue is that the articles variable ends up as a list with the correct number of Articles, but all of the data in each Article is null.. details
  • Right now the code that does the parsing looks like this: URL_http://pastie.org/2079115 [ URL_http://pastie.org/2079115 ] .The JSON is included.. details
  • Pretty much everything I can find online tells me to do it like the above, including the Gson API.. details
  • For reference, my Article.java looks like this: URL_http://pastie.org/2079165 [ URL_http://pastie.org/2079165 ] .. details
  • Thank you c0mrade.. details
  • Thank you c0mrade.. details
  • @c0mrade: thanks, now one last thing - instead of getting the desired format of [{"Original":12,"BBQ":23,"CatchUp":23}] I obtain this: [{"itemname":"Origin al","number","12"},{"itemname":"BBQ","number":"23"},{"itemname":"CatchUp","num ber":"23"}].. details
  • Seems like Gson.toJson(Object object) generates JSON code with randomly spread fields of the object.. details
  • Thanks.. details
  • Gson readily handles deserialization of a JSON object with name:value pairs into a Java CODETERM1 .. details
  • I need to parse a JSON Response that looks like: CODESNIPPET_JAVA1 .. details
  • If you use Gson, please read doc URL_http://google- gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/com/google/gson/Gson.html [here] .As CODETERM1 you can pass string with your json or Reader which streams your json data.. details
  • GSon uses reflections to set properties, so make sure you have setters for all properties in json, like CODETERM2 , CODETERM3 , CODETERM4 , .. .. details
  • Thanks in advance.. details
  • I am working with google app engine.. details
  • Gson might be simpler, but nonetheless with native JSON you can create a JSONObject with a Map or a String as parameters, pretty simple.. details
  • (In Detail: The result of the translation request ends at CODETERM3 , where the translated name is used to get the associated JSON element from a CODETERM4 , which has a CODETERM5 , called CODETERM6 , mapping JSON element names to their associated values.. details
  • If you're able to change Gson code for your project, then probably the part to change for the most efficient result is the call to CODETERM16 in CODETERM17 .. details
  • A CODETERM15 works in the same way.). details
  • I wonder ... if there is a way to get a value assigned to a case insensitive representation of a key?. details
  • Code shown below works well when CODETERM1 object contains CODETERM2 as it was passed to the method.. details
  • They look like this: CODETERM1 I need to parse these dates into hours and minutes using Java.. details
  • I want it to like this: CODETERM3 .. details
  • URL_http://code.google.com/p/google-gson [Gson] can do it similarly simply if you're satisfied with a CODETERM1 , instead of a CODETERM2 .. details
  • URL_http://code.google.com/p/google-gson [Gson] can do it similarly simply if you're satisfied with a CODETERM1 , instead of a CODETERM2 .. details
  • The actual values in the JSON would not be deserialized.. details
  • Gson would just create plain CODETERM3 instances for each value -- not CODETERM4 or CODETERM5 instances, but just plain CODETERM6 instances.. details
  • If the CODETERM14 type in the example is changed to CODETERM15 as recommended in another answer, then the output becomes CODETERM16 , which is of course probably useless.. details
  • Note that a CODETERM2 would not work as it does not provide enough type information for Gson to deserialize into.. details
  • If the JSON structure that you don't care to deserialize into a specific Java type is just an object that contains key-value pairs, where all of the values are JSON primitives, then the structure can be simply deserialized into a CODETERM1 .. details
  • On the surface it seems reasonable that Gson could be enhanced to create more type-specific instances for CODETERM7 values.. details
  • Note that this converts all values in the CODETERM6 into CODETERM7 .. details
  • If you wanted something more generic, like a CODETERM8 , or if CODETERM9 must be a plain old CODETERM10 without additional type information, then it's necessary to implement custom deserialization processing, URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Collections-Examples [as-described-in-the-user-guide] .. details
  • Then, the following example JSON and simple deserialization code runs as expected.. details
  • If you wanted something more generic, like a CODETERM8 , or if CODETERM9 must be a plain old CODETERM10 without additional type information, then it's necessary to implement custom deserialization processing, URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Collections-Examples [as-described-in-the-user-guide] .. details
  • A two-dimensional array != a single-dimensional array.. details
  • That said, if Gson is fast enough for your needs, then since it makes JSON deserialization so easy, it probably makes sense to use it.. details
  • The current and next releases of Gson reportedly include significant performance improvements, though I haven't looked for the latest performance test data to support those claims.. details
  • That said, if Gson is fast enough for your needs, then since it makes JSON deserialization so easy, it probably makes sense to use it.. details
  • In terms of the types described in the question, the JSON translated into a Java data structure that would match the JSON structure for easy deserialization with Gson is "an array of {TypeDTO object with an array of {ItemDTO object}}".. details
  • The current and next releases of Gson reportedly include significant performance improvements, though I haven't looked for the latest performance test data to support those claims.. details
  • I would most always rather have one simple line of code like CODESNIPPET_JAVA5 .. details
  • For the sake of completeness, I'll also point out that a simple custom serializer could be employed to solve this problem.. details
  • You need to create a custom serializer which serializes both the entryset and the bean properties of interest separately.. details
  • That's because instances implementing CODETERM1 have special treatment by Gson.. details
  • Gson currently has a mechanism to URL_http://groups.google.com/group/google- gson/browse_thread/thread/6272c9be58676e47 [register-a-Type-Hierarchy-Adapter] that reportedly can be configured for simple polymorphic deserialization, but I don't see how that's the case, as a Type Hierarchy Adapter appears to just be a combined serializer/deserializer/instance creator, leaving the details of instance creation up to the coder, without providing any actual polymorphic type registration.. details
  • It looks like Gson will soon have the CODETERM1 for simpler polymorphic deserialization.. details
  • A preferable approach might be to use an API that provides URL_http://json- schema.org [JSON-Schema] validation.. details
  • The JSON library that's pretty much standard for Cocoa and Cocoa Touch projects is called JSON-framework and it's hosted on google code: URL_http://code.google.com/p/json-framework/ [ URL_http://code.google.com/p/json - framework/] The JSON library for Java is called GSON, also from google code: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] I would recommend using both GSON and JSON frameworks (GSON for Java and JSON- Framework for objective-c).. details
  • The JSON library that's pretty much standard for Cocoa and Cocoa Touch projects is called JSON-framework and it's hosted on google code: URL_http://code.google.com/p/json-framework/ [ URL_http://code.google.com/p/json - framework/] The JSON library for Java is called GSON, also from google code: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] I would recommend using both GSON and JSON frameworks (GSON for Java and JSON- Framework for objective-c).. details
  • this looks good but now I get line "translatedText": "Hello world".what is translatedText?. details
  • JsonObject or JsonElement?and how to parse it if I have JsonObject result jarray.get(0).getAsJsonObject().getAsJsonObject("translatedText");String result2 result.toString();it doesnt works.. details
  • Applied to the example in the original question above, if it's acceptable to treat all of the values as Strings, then deserialization becomes simple.. details
  • (Yes, Java allows a type declaration of CODETERM7 , but CODETERM8 is not a specific enough type to meaningfully deserialize to.. details
  • Gson has special handling for deserializing some single-component arrays into a non-array type.. details
  • For example, the preferred type of the collection in the original question might be CODETERM5 , but that's not possible to define in Java.. details
  • Gson will also often deserialize a non-String value into a String, when asked.. details
  • Applying this to the first example, CODETERM3 works just as well.. details
  • Thanks for your answer.. details
  • But if you do not absolutely have to use Gson, Jackson does support programmatic creation of types (via TypeFactory methods) and allows what you are trying to achieve.. details
  • Gson hopefully will soon have the CODETERM1 for simpler polymorphic deserialization.. details
  • I am working on an Android application, using the EmpireAvenue API.The API uses JSON and I'm using the GSON library to parse the data from the API.Here is the problem: I have a JSON structure like this: CODESNIPPET_JAVA1 .. details
  • Thanks for your help.. details
  • Are you suggesting I do something like:ArrayList> data new ArrayList>(); Type arrayListType new TypeToken>>(){}.getType(); data gson.fromJson(json, arrayListType);I understand how this may work to store a String or int, but 3rd item in the array is an array, and if this array contains a JSON object { } then how would I model this?. details
  • I've searched but any results work for me.Thank you.. details
  • I've searched but any results work for me.Thank you.. details
  • Above approch is not working since I am not getting "Bonjour tout le monde" on return, it would be great pleasure if someone can extend my understanding.. details
  • Seems to me that GsonJsonConverterImplementation should be enough.. details
  • GSON is awesome, brings a python like feel to Java, well, atleast for JSON purposes.. details
  • If there's something more complex you need to do, you only need to add some field annotations or write a custom serializer/deserializer (which is pretty easy) and register it once.. details
  • If there's something more complex you need to do, you only need to add some field annotations or write a custom serializer/deserializer (which is pretty easy) and register it once.. details
  • price < 20) What is the best way to handle this.. details
  • It was declared like this: Category[] categories; UPdate: using TypeToken and Custom Serialization might help, see this doc: URL_https://sites.google.com/site/gson/gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] .. details
  • Now When I get an apple object, an apple could have more than one seed, or it could have one seed, or maybe no seeds!. details
  • Gson - Conditional JSON Deserialization (Sanity Checks).. details
  • I wish to add some condtional acceptance checks (sanity checks) to the incoming json.. details
  • Any help would be appreciated.. details
  • I have code in my android project that correctly deserializes json into POJO's using gson.. details
  • Two most commonly recommended choices are URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [Gson] , and both work nicely to allow you to not only parse and write JSON, but to also bind JSON data directly to and from POJOs.. details
  • Two most commonly recommended choices are URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [Gson] , and both work nicely to allow you to not only parse and write JSON, but to also bind JSON data directly to and from POJOs.. details
  • That's XML, not JSON, mate.. details
  • The problem is that the Collection of Keywords returns null values - although it seems to have the correct size, which is positive.. details
  • I want to extract the values of "text" and put them into a Set of Strings (i.e.. details
  • The JSON looks like this: CODESNIPPET_JAVA5 .. details
  • I have a JSON response that looks like this.. details
  • The JSON looks like this: CODESNIPPET_JAVA5 .. details
  • The problem is that the Collection of Keywords returns null values - although it seems to have the correct size, which is positive.. details
  • The problem is that the Collection of Keywords returns null values - although it seems to have the correct size, which is positive.. details
  • The problem is that the Collection of Keywords returns null values - although it seems to have the correct size, which is positive.. details
  • It's my experience that this is often not a safe assumption to make.. details
  • Regarding the code in the original question, it looks like it assumes that objects in the response JSON will appear in some particular order.. details
  • Any pro-tips would be greatly appreciated.. details
  • Thanks.. details
  • @Gubatron Thanks dude you are right i have just downloaded it and make jar so now its working fine.. details
  • @Gubatron Thanks dude you are right i have just downloaded it and make jar so now its working fine.. details
  • @Gubatron Thanks dude you are right i have just downloaded it and make jar so now its working fine.. details
  • @Gubatron Thanks dude you are right i have just downloaded it and make jar so now its working fine.. details
  • The easiest thing might be just to do it yourself: use something like GSON or tapestry's JSONObject to construct a java representatin of your json, then just iterate through it and build whatever map structure you like.. details
  • hey hi i didnt find in it can you give me link.. details
  • hey hi i didnt find in it can you give me link.. details
  • @Iain :-) (+6 chars).. details
  • Keep in mind that I am extremely new to serialization in general, so please be gentle if the answer is very obvious.Note: I removed the Reader/Writers for a String "s" to simplify the code.. details
  • Can anyone please explain to me what, if anything, I can do to make this work?. details
  • EDIT: Corrected to test: Thanks to ColinD CODESNIPPET_JAVA3 .. details
  • To my newbie eyes this looks correct.. details
  • Thanks.. details
  • EDIT2: I honestly dont know why, but when I replaced the simple String[] embeded in my TestObject with an ArrayList, it started serializing correctly.. details
  • According to URL_http://sites.google.com/site/gson/gson-user-guide#TOC- Collections-Examples [GSON-documentation] you can do things like: CODESNIPPET_JAVA1 .. details
  • So I'm using GSON to parse JSON from an API and am stuck as to how to have it parse the dynamic fields in the data.. details
  • I know this works on the sub-data as I can query and get a single entry and parse that quite easily, but what about the random integer values given for each value in the array?. details
  • How to parse dynamic JSON fields with GSON?. details
  • I appreciate this answer, but it seems to me that Gson has (or should have, anyway) a way to map how a json field is mapped to an object.... details
  • With Protocol Buffers, you specify message structures declaratively and the library will take care of the structural validation for you (though there will still be things that you need to validate manually).. details
  • GSON is not particularly fast, but the Jackson library can almost compete with most binary serializers (Jackson is 2-4x faster than GSON in most situations and 10-20x faster on UTF-8 because it has special code for UTF-8).. details
  • GSON is not particularly fast, but the Jackson library can almost compete with most binary serializers (Jackson is 2-4x faster than GSON in most situations and 10-20x faster on UTF-8 because it has special code for UTF-8).. details
  • I've tried gson on the Android end, and it works nicely.. details
  • You would have to use something like this instead: CODESNIPPET_JAVA2 .. details
  • Use URL_http://code.google.com/p/google-gson/ [Gson] !. details
  • Use URL_http://code.google.com/p/google-gson/ [Gson] !. details
  • I've had good experiences with URL_http://code.google.com/p/google-gson/ [Google-Gson] .. details
  • Thank you.. details
  • Create a simple method to generate the GSON object using the GsonBuilder (similar to Arthur's explanation) 4.. details
  • Can someone please correct me .. details
  • See URL_http://groups.google.com/group/google- gson/browse_thread/thread/6272c9be58676e47# [ URL_http://groups.google.com/group /google-gson/browse_thread/thread/6272c9be58676e47#] Happy coding.. details
  • It looks like you want to convert it to Json, using google gson URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] its very easy "Provide simple toJson() and fromJson() methods to convert Java objects to JSON and vice-versa" Here is what I mean : CODESNIPPET_JAVA1 .. details
  • It looks like you want to convert it to Json, using google gson URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] its very easy "Provide simple toJson() and fromJson() methods to convert Java objects to JSON and vice-versa" Here is what I mean : CODESNIPPET_JAVA1 .. details
  • It works fine after you unzip the package and add the jars in your build path.. details
  • Thanks in advance,jellyfish Edit: Now I have CODESNIPPET_JAVA2 .. details
  • I am pretty sure that there is an easier solution, but I seem unable to find it!. details
  • So something like: CODESNIPPET_JAVA2 .. details
  • Thank you, I have been using android's offering currently, but I may resort to GSON in the future for more complicated stuff.. details
  • Some good examples and articles.. details
  • To make the use more generic - you will find that the URL_http://google- gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [javadoc] of this are pretty clear and helpful.. details
  • To make the use more generic - you will find that the URL_http://google- gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [javadoc] of this are pretty clear and helpful.. details
  • And if you can't make it work with Gson, there are others you can try out, with more powerful data binding featuers.. details
  • Can any help?Thank you.. details
  • But what should be where the 'XXX' are?. details
  • Thanks, this is an easier way :).. details
  • Serializing works since you pass it in an actual class, Cat, but deserialization fails since the Exhibition class only has an Animal, gson doesnt know which implementing class to revive.. details
  • I like to process there itself.. details
  • Sure there is, I suggest you to try URL_http://code.google.com/p/google-gson/ [Google's-API] which provides a good boxed way to serialize/deserialize data from java objects to JSON and vice-versa.. details
  • int[] ints2 gson.fromJson("[1,2,3,4,5]", int[].class); something like this is what I was looking for.. details
  • Thanks.. details
  • thanx , but i tried this it not work for circular dependencies.. details
  • I like to use google-gson for this, and it's precisely because I don't need to work with JSONObject directly.. details
  • However, I think your question is more like, How do I endup with an actual JSONObject object from a JSON String.. details
  • I think the beauty of google-gson is that you don't need to deal with JSONObject.. details
  • I like to use google-gson for this, and it's precisely because I don't need to work with JSONObject directly.. details
  • However, I think your question is more like, How do I endup with an actual JSONObject object from a JSON String.. details
  • I think the beauty of google-gson is that you don't need to deal with JSONObject.. details
  • _**Another example for Gson:**_ Gson is easy to learn and implement, you need to know is the following two methods: -> toJson() convert java object to JSON format -> fromJson() convert JSON into java object CODESNIPPET_JAVA4 .. details
  • Here's a deserializer that understands single Person entries as well as arrays of them: CODESNIPPET_JAVA2 .. details
  • Try the URL_http://code.google.com/p/google-gson/ [GSon] from google and and URL_http://flexjson.sourceforge.net/ [FlexJson] Both are recommended .. details
  • Try the URL_http://code.google.com/p/google-gson/ [GSon] from google and and URL_http://flexjson.sourceforge.net/ [FlexJson] Both are recommended .. details
  • Try the URL_http://code.google.com/p/google-gson/ [GSon] from google and and URL_http://flexjson.sourceforge.net/ [FlexJson] Both are recommended .. details
  • Try the URL_http://code.google.com/p/google-gson/ [GSon] from google and and URL_http://flexjson.sourceforge.net/ [FlexJson] Both are recommended .. details
  • Google Gson is the best library URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • Google Gson is the best library URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] .. details
  • Thanks.. details
  • try truncating the incoming string before passing to GSON, so that it looks like this CODESNIPPET_JAVA1 .. details
  • However after CODETERM1 para still has all of it's uninitialized values.. details
  • However after CODETERM1 para still has all of it's uninitialized values.. details
  • Thanks .. details
  • Please advice how to convert a CODETERM1 to CODETERM2 using CODETERM3 library.. details
  • This works perfectly fine.. details
  • Take a look at the following code, which works fine: CODESNIPPET_JAVA1 .. details
  • MyData is just a simple class with int and String fields.. details
  • It works fine if the object is not an array, like so: CODESNIPPET_JAVA2 .. details
  • This works perfectly fine.. details
  • Ideally, what You are getting from Gson is correct.. details
  • Thanks Klaus .. details
  • Here is a brief tutorial on the same along with WCF example: URL_http://benjii.me/2010/04/deserializing-json-in-android-using- gson/ [Gson-example/tutorial] Hope the above information would be useful in your context.. details
  • Android has JSON parsers build in its SDK - the package is org.json Beside this you can use libraries like Gson that wraps the json parsing in simple to use API.. details
  • Beside this I would like to mention my humble opinion on your decision to go ahead with Android native application and WCF Json services.. details
  • Here is a brief tutorial on the same along with WCF example: URL_http://benjii.me/2010/04/deserializing-json-in-android-using- gson/ [Gson-example/tutorial] Hope the above information would be useful in your context.. details
  • +1 @StaxMan it seems like that.. details
  • If I want to add more maps to my class Example, I have to write in my function toJSON() something like String out=gson.toJson(this.General); out+=gson.toJson(this.Map2); out+=gson.toJson(this.map3); ... return out;.. details
  • Simple Json to Java convertion using GSON.. details
  • My guess is that I'm missing something really simple and obvious so a fresh view on the code would probably help.So here is what I have: JSON CODESNIPPET_JAVA1 .. details
  • I've looked through similar issues like URL_http://stackoverflow.com/questions/1688099/converting-json-to-java/ [Converting-Json-to-Java] , all of which suggest similar approach to solution.. details
  • I decide to test GSON on some simple input - can't make it any simpler and it still doesn't work.. details
  • And I used Gson in an Android app, it works like a charm !.. details
  • You just need to say something like - "(new Gson()).fromJson(numbersText, PhoneStatus.class)".. details
  • Gson takes care of internals for you.. details
  • Perhaps the example would be more clear if I got rid of the String type for Deserializer.. details
  • This works fine as long as the object is a non-generic type.. details
  • Hope this helps.. details
  • You can solve this problem by specifying the correct parameterized type for your generic type.. details
  • Thank U... .. details
  • Android comes with a lot you can use, or you can use GSON which I've had great success with: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] See how easy it is: CODESNIPPET_JAVA1 .. details
  • GSON works just fine with a whole range of classes including your own class objects, arrays, and some collections.. details
  • Android comes with a lot you can use, or you can use GSON which I've had great success with: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] See how easy it is: CODESNIPPET_JAVA1 .. details
  • The JSON returned will be either... 1) A successful response of a known type (e.g.. details
  • I'd like GSON to convert to the correct type depending on the existence of the CODETERM1 key/value pair above.. details
  • @Callie: No, no one is saying you must use gson, but you should definitely use a JSON library, and the accepted answer of the question i linked recommends gson.. details
  • You need a JSON library, and i just linked you to a question about JSON libraries, and the accepted answer recommends gson.. details
  • In your response filter, you could clip out the class name from generated json, or better yet, return String in response and use custom json serialization mechanism like Google-gson.. details
  • Here is a more recent benchmark of java serializers: URL_http://code.google.com/p/thrift - protobuf-compare/wiki/Benchmarking Notable: "Omitted from the first three charts: json/google-gson and scala.. details
  • I hope that helps.. details
  • :) .. details
  • The map can now contain your dynamic keys.. details
  • The dynamic-fields will change its name depending on the structure sent.. details
  • Thanks Balusc.. details
  • Thank you Edit I'm trying to see if it's possible to emulate the behavior of URL_https://cwiki.apache.org/confluence/display/WW/JSON%20Plugin [Struts2-JSON-plugin] using Gson CODESNIPPET_JAVA2 .. details
  • Using the method CODETERM4 , FieldAttributes doesn't contain enough information to match the field with a filter like CODETERM5 .. details
  • This worked perfectly for me and it seems simpler than adding yet another library to the project.. details
  • You can register this adapter like: CODESNIPPET_JAVA2 .. details
  • And then call it like: CODESNIPPET_JAVA3 .. details
  • The way my yaml deserializer works, it defaults JSON objects to CODETERM2 when you don't specify a type, but gson doesn't seem to do this.. details
  • So this serializes nicely -- but understandably drops the type information on the Animal: CODESNIPPET_JAVA2 .. details
  • So this serializes nicely -- but understandably drops the type information on the Animal: CODESNIPPET_JAVA2 .. details
  • URL_http://stackoverflow.com/questions/1434931/getting-json-from-jersey-with-circular-dependencies [Jersey] (Use @JsonIgnore instead of @XmlTransient to break the circular dependency) URL_http://code.google.com/p/google-gson/ [Gson] (doesn't support circular references.. details
  • URL_http://stackoverflow.com/questions/1434931/getting-json-from-jersey-with-circular-dependencies [Jersey] (Use @JsonIgnore instead of @XmlTransient to break the circular dependency) URL_http://code.google.com/p/google-gson/ [Gson] (doesn't support circular references.. details
  • URL_http://stackoverflow.com/questions/1434931/getting-json-from-jersey-with-circular-dependencies [Jersey] (Use @JsonIgnore instead of @XmlTransient to break the circular dependency) URL_http://code.google.com/p/google-gson/ [Gson] (doesn't support circular references.. details
  • URL_http://stackoverflow.com/questions/1434931/getting-json-from-jersey-with-circular-dependencies [Jersey] (Use @JsonIgnore instead of @XmlTransient to break the circular dependency) URL_http://code.google.com/p/google-gson/ [Gson] (doesn't support circular references.. details
  • Check this: URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from- json-format-gson-api/ [GSon] .It's worth a try with the circular dependencies.. details
  • Good luck!. details
  • There are some libraries to parse json string into java objects: URL_http://code.google.com/p/google-gson/ [google-gson] URL_http://www.json.org/java/ [ URL_http://www.json.org/java/ ] URL_http://code.google.com/p/json-simple/ [json-simple] URL_http://jackson.codehaus.org/ [jackson] This URL_http://stackoverflow.com/questions/338586/a-better-java-json-library [link] is very usefull!. details
  • There are some libraries to parse json string into java objects: URL_http://code.google.com/p/google-gson/ [google-gson] URL_http://www.json.org/java/ [ URL_http://www.json.org/java/ ] URL_http://code.google.com/p/json-simple/ [json-simple] URL_http://jackson.codehaus.org/ [jackson] This URL_http://stackoverflow.com/questions/338586/a-better-java-json-library [link] is very usefull!. details
  • Dude, you are amazing, thank you so much, it works.My mistake was not create a constructor with no args.Thank you so much!.. details
  • Dude, you are amazing, thank you so much, it works.My mistake was not create a constructor with no args.Thank you so much!.. details
  • How do I create a json Object using Google Gson?The following code creates a json object which looks like CODETERM1 CODESNIPPET_JAVA1 .. details
  • How do I create a jSon Object like this one?. details
  • I believe your answer lies in the URL_http://sites.google.com/site/gson/gson- user-guide#TOC-JSON-Field-Naming-Support [JSON-Field-Naming-Support] : Gson supports some pre-defined field naming policies to convert the standard Java field names (i.e.. details
  • i'm working with the youtube json from google-api-client : CODESNIPPET_JAVA1 .. details
  • @venkatesh if you are asking to create JSON from Object than its very well possible using new com.google.gson.Gson().toJson(obj);.. details
  • Thanks, But I get this object at dynamically(when i called web service) Is it possibile to convert json object to string using tostring() method or any onther method require please help me.. details
  • I tried to google a way to do this in Gson, but no luck.. details
  • Gson serialize POJO with root value included?. details
  • Thanks!. details
  • Gson is pretty cool.. details
  • Here is the link: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] well documented .. details
  • Here is the link: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] well documented .. details
  • Gson is good choice!easy to use, fast, reliable.. details
  • Gson is good choice!easy to use, fast, reliable.. details
  • So you may want to consider other libraries: I would recommend URL_http://jackson.codehaus.org [Jackson] , Gson also works.. details
  • If you would prefer to change the default representation, you can do so by registering a type adapter through GsonBuilder.registerTypeAdapter(Type, Object).. details
  • The reason why URL_http://stackoverflow.com/questions/4547739/how-to- serialize-a-map-of-a-map-with-gson/4547790#4547790 [Nishant's-answer] works is because Gson's default constructor enables all kind of stuff per default that you would otherwise have to manually enably using the GsonBuilder.. details
  • You can configure Gson to serialize null values by setting GsonBuilder.serializeNulls().. details
  • _**UPDATE:**_ URL_http://stackoverflow.com/questions/4544191/how-do-i-correctly-use- generics/4544641#4544641 [As-Abhinav-points-out] , the GSON library will help you accomplish your final goal of deserializing objects in a way that uses generics appropriately.. details
  • Thanks, URL_http://stackoverflow.com/users/526635/abhinav [Abhinav] for pointing out GSON!. details
  • How to create JSON file with URL_http://code.google.com/p/google-gson/ [Gson] library like below: CODESNIPPET_JAVA2 .. details
  • How to create JSON file with URL_http://code.google.com/p/google-gson/ [Gson] library like below: CODESNIPPET_JAVA2 .. details
  • Oh, It works.. details
  • You might have problems as you have an array of String and int in the multidimensional array.. details
  • Gson is great, and has high quality documentation too.. details
  • Gson is great, and has high quality documentation too.. details
  • Luckily the [remedy]( URL_http://stackoverflow.com/questions/4147012/can-you-avoid-gson - converting-and-into-unicode-escape-sequences/4147245#4147245) is easy once you know where to look.. details
  • :) Otherwise, after one day's experience with it, I find Gson a really clean, nice library, with a great [user guide]( URL_http://sites.google.com/site/gson/gson-user-guide ) too!.. details
  • Luckily the [remedy]( URL_http://stackoverflow.com/questions/4147012/can-you-avoid-gson - converting-and-into-unicode-escape-sequences/4147245#4147245) is easy once you know where to look.. details
  • :) Otherwise, after one day's experience with it, I find Gson a really clean, nice library, with a great [user guide]( URL_http://sites.google.com/site/gson/gson-user-guide ) too!.. details
  • That is rather strange default setting, although perfectly legal thing to do from JSON spec perspective.. details
  • GSON is simple to use IMHO.. details
  • Google has a JSON - Java library - URL_http://code.google.com/p/google-gson/ [google-gson] , which might be helpful to you.. details
  • Google has a JSON - Java library - URL_http://code.google.com/p/google-gson/ [google-gson] , which might be helpful to you.. details
  • When I get the top element "routes" its fine and printing it displays what inside the element but when I try to for example to get the element "summary" as shown, the return is null, thats whats is displayed in the output, so subsequently I cannot get the value of it.. details
  • Please reply back to me as soon as you can.. details
  • how can get the value of any JsonElement?. details
  • Thanks in advance.. details
  • Also: Jackson works fine on Android, if you don't mind using it over Gson.. details
  • Can Gson be configured to parse a timestamp-formatted date such as 1291158000000 into a java.util.Date object?. details
  • With Gson, you'd just need to do something like: CODESNIPPET_JAVA1 .. details
  • Can someone help me, please?. details
  • Best regards,Valter Henrique.. details
  • CODETERM6 , CODETERM7 , etc become CODETERM8 keys and its value becomes the CODETERM9 value of CODETERM10 .. details
  • And then use that like so: CODESNIPPET_JAVA3 .. details
  • The json string was designed for use in php not java so when i decoded it in php it gave me a good multi- dimensional assoc array.. details
  • It works if I revert back to List>.. details
  • Thanks for pointing that out.. details
  • The best solution for you would probably be to use the Gson object at the location where you know the type of the object you need to serialize/deserialize.. details
  • It works well in C#.. details
  • It works well in C#.. details
  • Btw, I prefer google-gson .. details
  • Btw, I prefer google-gson .. details
  • In the latter case, it's probably easier to use URL_http://code.google.com/p/google-gson/ [GSON] , as recommended by @The Elite Gentleman.. details
  • In the latter case, it's probably easier to use URL_http://code.google.com/p/google-gson/ [GSON] , as recommended by @The Elite Gentleman.. details
  • I don't know if GSON supports heterogeneous 2D arrays, but try this and find out: CODESNIPPET_JAVA1 .. details
  • This will _probably_ fail as it gives GSON no type information with which to resolve the nested entities, but it's worth a try.. details
  • Thank you.. .. details
  • It not works... and get error.. details
  • It not works... and get error.. details
  • URL_http://code.google.com/p/google-gson/ [Gson] from google is good for me .. details
  • URL_http://code.google.com/p/google-gson/ [Gson] from google is good for me .. details
  • It seems like URL_http://sites.google.com/site/gson/Home [GSON] supports this, although I don't know if you want to switch from the json library you are using From the user guide: CODESNIPPET_JAVA1 .. details
  • It seems like URL_http://sites.google.com/site/gson/Home [GSON] supports this, although I don't know if you want to switch from the json library you are using From the user guide: CODESNIPPET_JAVA1 .. details
  • Alternatively you may be able to sub-class HashMap into your own type (MyEntityMap extends HashMap), since then type information can be inferred from generic super type; and passing MyEntityMap.class would give type information that most JSON libraries can use (Jackson and GSON at least).. details
  • Thanks going to review php file.. details
  • Otherwise, URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [GSON] at least have full bean serialization as well as allowing custom serializers.. details
  • Otherwise, URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [GSON] at least have full bean serialization as well as allowing custom serializers.. details
  • Most also do not fully support the use of Java Generics.. details
  • [ { "data": [ [ 1, 1, "Text" ], [ 2, 2, "Text" ], [ 3, 0, "Text" ], [ 5, 2, "Text" ] ], "label": "First Series" } ] I have read on these forums Gson is my best bet going forward.. details
  • Thanks in advance .. details
  • I manage to build a class that looks like this: CODESNIPPET_JAVA2 .. details
  • Can someone please tell me how to deserialize this?. details
  • If GSON does not fit your needs, I recommend URL_http://code.google.com/p/jsonmarshaller/ [JsonMarshaller] .. details
  • I am using gson 1.3 (I cannot use any other version as i can only use the versions in the corporate repository) thanks .. details
  • gson invoking standard deserialization in custom deserializer.. details
  • gson ignoring map entries with value=null.. details
  • Thank you .. details
  • Previous answer** (no need to do this) I'm not sure if Gson has some easier built in way to do this, but this seems to work: CODESNIPPET_JAVA2 .. details
  • It has a URL_http://wiki.fasterxml.com/JacksonDataBinding [databinding- solution] (like Gson) and a URL_http://wiki.fasterxml.com/JacksonTreeModel [tree-model-view] (like JSONObject) CODESNIPPET_JAVA1 .. details
  • Note that URL_http://wiki.fasterxml.com/JacksonHome [Jackson] fixes these issues, and is URL_https://github.com/eishay/jvm-serializers/wiki [faster] than GSON.. details
  • The full objects won't even be copied!. details
  • Note that URL_http://wiki.fasterxml.com/JacksonHome [Jackson] fixes these issues, and is URL_https://github.com/eishay/jvm-serializers/wiki [faster] than GSON.. details
  • Also, if you have an array of Objects, and you deserialize some json into that array of Objects, the true types are LOST!. details
  • Perfect.. details
  • Thank you.. details
  • gson does the job very well, thanks @rsilva !. details
  • gson does the job very well, thanks @rsilva !. details
  • But if you'd like to keep it a CODETERM7 , then you need to create a custom Gson deserializer.. details
  • Thanks.. details
  • Thanks!.. details
  • That worked perfectly.. details
  • Json-lib is sometimes easier to get to grasp with for smaller tasks that do not require top-speed, but with still completely acceptable results.Gson as also a good reputation and is very flexible, however the previous benchmarks I came across seemed to indicate that it did not perform as well as Jackson.. details
  • Json-lib is sometimes easier to get to grasp with for smaller tasks that do not require top-speed, but with still completely acceptable results.Gson as also a good reputation and is very flexible, however the previous benchmarks I came across seemed to indicate that it did not perform as well as Jackson.. details
  • Regarding security, I think your best option here would be to support SSL for the connections.. details
  • Regarding security, I think your best option here would be to support SSL for the connections.. details
  • I would like to be able to do something like: CODESNIPPET_JAVA2 .. details
  • Is there a best practice way of doing this?. details
  • and ItemDTO is like CODESNIPPET_JAVA2 .. details
  • where CODETERM2 is like CODESNIPPET_JAVA1 .. details
  • If you can't find a library that does what you need, I second the suggestion of using looser structured classes (like HashMap) or custom representation classes for being the link between your code and the JSON.. details
  • Good luck.. details
  • CODETERM5 , CODETERM6 and CODETERM7 being Strings here as well.. details
  • As an alternative you could create a simple CODETERM3 template like the following: CODESNIPPET_JAVA2 .. details
  • My only guess as to why this doesn't work is that GSON (the JSON library in use by play) doesn't know how to convert that to key-value pairs (although your array is 2-dimensional).. details
  • Put that into CODETERM2 and you should be fine.. details
  • Hi, thanks for your answer.. details
  • That's not extremely hard to do.. details
  • That's not extremely hard to do.. details
  • i was hoping there was a way to generate the pojo java classes based on some definition.. details
  • i was hoping there was a way to generate the pojo java classes based on some definition.. details
  • Using gson, the best i can do is: CODESNIPPET_JAVA1 .. details
  • Using annotations you can tell GSON that the mySuperCoolField is actually called this_field_is_fun in the JSON and it will unpack it correctly.. details
  • At least I think it works for deserialization too.. details
  • The easiest thing to do (which would be ugly, but very clean and simple if the first suggestion doesn't work) would be to simply name the field in a way to make GSON happy, and add extra accessor methods with the names you like, e.g.. details
  • If that doesn't work, you can use custom JsonSerializer/JsonDeserializers, which work great, but you have to update them for changes in your class (like when you add a field).. details
  • Choices like Jackson and Gson are big improvements so it is worth considering using them.. details
  • Choices like Jackson and Gson are big improvements so it is worth considering using them.. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] In addition, it may be helpful to use this tool to test your data (your data is valid btw): URL_http://jsonformatter.curiousconcept.com/ [ URL_http://jsonformatter.curiousconcept.com/ ] .. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] In addition, it may be helpful to use this tool to test your data (your data is valid btw): URL_http://jsonformatter.curiousconcept.com/ [ URL_http://jsonformatter.curiousconcept.com/ ] .. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] In addition, it may be helpful to use this tool to test your data (your data is valid btw): URL_http://jsonformatter.curiousconcept.com/ [ URL_http://jsonformatter.curiousconcept.com/ ] .. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] In addition, it may be helpful to use this tool to test your data (your data is valid btw): URL_http://jsonformatter.curiousconcept.com/ [ URL_http://jsonformatter.curiousconcept.com/ ] .. details
  • Any help gratefully received.. details
  • I would actually need something like ?. details
  • and the data accessed in a list like so CODESNIPPET_JAVA8 .. details
  • Pretty much all alternatives from org.json list provide more convenient and simpler ways to work with JSON.Aside from Gson that some like, I would recommend URL_http://wiki.fasterxml.com/JacksonInFiveMinutes [Jackson] ; and flex-json and Svenson are other packages that seem decent.. details
  • I could do this potentially with an inner class that has methods like CODETERM1 that my outer class delegates to and does the JSON parse to return a JsonObject, but I'm wondering if there's another way.. details
  • You can then create an instance of the correct type of CODETERM4 based on that.. details
  • Thanks!. details
  • Thanks for the answer.... details
  • I tried it and it works perfectly!.. details
  • This does work and Gson seems to use a LinkedHashMap so the order of the args is preserved as well, which is important for invoking the method.. details
  • I simply wrote this:Data data new Gson().fromJson(json.toString(),Data.class);The Data object is a simple java- object with getters and setters for the fields, sharing the name of the json attributes.. details
  • GSON is good realy good lib.. details
  • I think BalusC gave good pointers for the specific question wrt GSon (and in general, one-to-one data binding); but just in case you think there should be more dynamic handling, you could also consider other JSON processing packages.. details
  • Some offer looser mapping (you define names of things to types), others actual support for polymporphic types (declaring an Object but can actually map to subtype that was serialized).. details
  • Some offer looser mapping (you define names of things to types), others actual support for polymporphic types (declaring an Object but can actually map to subtype that was serialized).. details
  • :) ) .. details
  • Perhaps the Gson Map serializer is smart enough to deserialize that?. details
  • (Don't have the moment to test it thoroughly, but I hope it works!. details
  • Edit The JSON format that would be easiest for calling Java methods would be something like: CODESNIPPET_JAVA3 .. details
  • Then you could write a simple class like: CODESNIPPET_JAVA1 .. details
  • That might look something like this: CODESNIPPET_JAVA2 .. details
  • It seems to work... but since I'm new to Java, I'm not sure that's the proper way to do it.What do you think?Thanks again!. details
  • The following represent valid three-dimensional matrices which should be perfectly handled by Gson: CODETERM4 (recommended) CODETERM5 CODETERM6 CODETERM7 CODETERM8 That said, I would prefer URL_http://download.oracle.com/javase/6/docs/api/java/util/List.html [CODETERM9] above URL_http://download.oracle.com/javase/6/docs/api/java/util/Collection.html [CODETERM10] in this particular case.. details
  • Hope this helps.. details
  • Something like CODETERM2 .. details
  • I can recommend using URL_http://code.google.com/p/google-gson/ [Google-Gson] for the converting between JSON and Java.. details
  • Then, you'll be able to convert between JSON and Java like follows: CODESNIPPET_JAVA2 .. details
  • Then, you'll be able to convert between JSON and Java like follows: CODESNIPPET_JAVA2 .. details
  • I can recommend using URL_http://code.google.com/p/google-gson/ [Google-Gson] for the converting between JSON and Java.. details
  • GSON is a fairly good Java-based JSON library.. details
  • GSON is a fairly good Java-based JSON library.. details
  • I hope you can fill the missing parts by yourself.. details
  • I played with it (mainly using Gson for java) and it seems quite nice.. details
  • I rely on URL_http://code.google.com/p/google-gson/ [Google-JSON] To handle this kind of issue by using The feature URL_http://sites.google.com/site/gson/gson-user-guide#TOC-User-Defined- Exclusion-Strategies [Excluding-Fields-From-Serialization-and-Deserialization] Suppose a bi-directional relationship between A and B class as follows CODESNIPPET_JAVA1 .. details
  • I rely on URL_http://code.google.com/p/google-gson/ [Google-JSON] To handle this kind of issue by using The feature URL_http://sites.google.com/site/gson/gson-user-guide#TOC-User-Defined- Exclusion-Strategies [Excluding-Fields-From-Serialization-and-Deserialization] Suppose a bi-directional relationship between A and B class as follows CODESNIPPET_JAVA1 .. details
  • I rely on URL_http://code.google.com/p/google-gson/ [Google-JSON] To handle this kind of issue by using The feature URL_http://sites.google.com/site/gson/gson-user-guide#TOC-User-Defined- Exclusion-Strategies [Excluding-Fields-From-Serialization-and-Deserialization] Suppose a bi-directional relationship between A and B class as follows CODESNIPPET_JAVA1 .. details
  • I rely on URL_http://code.google.com/p/google-gson/ [Google-JSON] To handle this kind of issue by using The feature URL_http://sites.google.com/site/gson/gson-user-guide#TOC-User-Defined- Exclusion-Strategies [Excluding-Fields-From-Serialization-and-Deserialization] Suppose a bi-directional relationship between A and B class as follows CODESNIPPET_JAVA1 .. details
  • Converting the other way on is also simple using CODETERM2 .. details
  • Easy!. details
  • And to get the map item at x=3 and y=3: CODESNIPPET_JAVA5 .. details
  • Easy!. details
  • Converting the other way on is also simple using CODETERM2 .. details
  • And to get the map item at x=3 and y=3: CODESNIPPET_JAVA5 .. details
  • You can do this just fine with google-gson.. details
  • You can do this just fine with google-gson.. details
  • I am having the same problem but I have successfully preverified the jar that I am using.. details
  • I am having the same problem but I have successfully preverified the jar that I am using.. details
  • There are several JSON libraries in Java available which you can implement in your webapp, the popular ones being under each URL_http://www.json.org/java/ [JSON.org] , URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [Google-Gson] .. details
  • It has excellent support for parameterized collections and (nested) Javabeans.. details
  • Converting JSON to a fullworthy Javabean is also simple with Gson, see URL_http://stackoverflow.com/questions/1688099/converting-json-to- java/1688182#1688182 [this-example] .. details
  • There are several JSON libraries in Java available which you can implement in your webapp, the popular ones being under each URL_http://www.json.org/java/ [JSON.org] , URL_http://jackson.codehaus.org [Jackson] and URL_http://code.google.com/p/google-gson/ [Google-Gson] .. details
  • It has excellent support for parameterized collections and (nested) Javabeans.. details
  • We use here Gson to our satisfaction.. details
  • It's basically as simple as follows: CODESNIPPET_JAVA1 .. details
  • +1 I was looking for something similar and this fits the bill perfectly!.. details
  • It supports java collections etc... check it out here: URL_http://sites.google.com/site/gson/gson-user-guide .. details
  • Do I have use external parser for that like GSON?. details
  • It's like trying to escape URLs manually, instead of using URLEncode/Decode.... details
  • By manually I meant not by using a JSON library like Simple JSON, Gson, or XStream.. details
  • It's successfully loaded and I can see google-gson under referenced libraries in the package explorer.. details
  • Gson gson new Gson(); It highlights Gson and says that "Gson cannot be resolved to a type.". details
  • Android Eclipse Error: "Gson cannot be resolved to a type".. details
  • It's successfully loaded and I can see google-gson under referenced libraries in the package explorer.. details
  • Android Eclipse Error: "Gson cannot be resolved to a type".. details
  • I've tried removing the jars, cleaning the project and re-adding the jars but it still doesn't work.. details
  • Chris - you are awesome.. details
  • Chris - you are awesome.. details
  • Thank you so very much for your help!.. details
  • Thank you so very much for your help!.. details
  • I'm developing a simple application for Blackberry and i'm using Google's gson to retrieve some data from a server.. details
  • The UI was working fine but when I added the gson part it started failing, it wont run.. details
  • Not sure what you mean by "creating json manually", but you can use something like gson ( URL_http://code.google.com/p/google-gson/) , and that would transform your HashMap, Array, String, etc, to a JSON value.. details
  • Not sure what you mean by "creating json manually", but you can use something like gson ( URL_http://code.google.com/p/google-gson/) , and that would transform your HashMap, Array, String, etc, to a JSON value.. details
  • Use something like: CODESNIPPET_JAVA2 .. details
  • Simple situation - 1. read a json file 2. discover all key-value pairs 3. compare key-value pairs I tried gson, package from json.org, but can't seem to get far with it.. details
  • Can you please advise that am i missing.. details
  • I prefer using URL_http://sites.google.com/site/gson/gson-user-guide [Gson] for parsing JSON responses to POJO's.. details
  • URL_http://code.google.com/p/google-gson/ [Google-Gson] is useful in this.. details
  • URL_http://code.google.com/p/google-gson/ [Google-Gson] is useful in this.. details
  • Thank you.. details
  • Hi, thanks for your answer!. details
  • Assuming that your Java object structure is exactly what you would like to end up with, then your JSON structure should look like follows to get Gson to do its job: CODESNIPPET_JAVA4 .. details
  • Gson is smart, but not _that_ smart :) So, as a basic example, this JSON structure with an array: CODESNIPPET_JAVA1 .. details
  • The JSON response looks like this: CODESNIPPET_JAVA1 .. details
  • For the jQuery + JSON + Servlet + HTML table mix, I've posted similar answers before URL_http://stackoverflow.com/questions/2203269/loading-alternative- content-via-tabs-and-jquery-and-jsp/2203376#2203376 [here] and URL_http://stackoverflow.com/questions/1900711/handling-servlet-output-in- ajax/1900796#1900796 [here] with code examples how to populate a table with help of URL_http://code.google.com/p/google-gson/ [Google-Gson] and a Servlet, you may find it useful.. details
  • For the jQuery + JSON + Servlet + HTML table mix, I've posted similar answers before URL_http://stackoverflow.com/questions/2203269/loading-alternative- content-via-tabs-and-jquery-and-jsp/2203376#2203376 [here] and URL_http://stackoverflow.com/questions/1900711/handling-servlet-output-in- ajax/1900796#1900796 [here] with code examples how to populate a table with help of URL_http://code.google.com/p/google-gson/ [Google-Gson] and a Servlet, you may find it useful.. details
  • After all it's fairly simple, believe me.. details
  • Good luck.. details
  • I'm not married to Gson, so if there's an alternative library that can do this I'd be happy to use it.. details
  • Gson is a full-fledged serializer that can handle most conditions.It's source is kind of over encapsulated, I think for simple problems,this can be done within 100 lines of code.. details
  • I'm not sure that makes tons of sense, but that's fine.. details
  • At any way: Gson is open source.. details
  • Thanks, I use Gson a lot and jackson, jsonlib.. details
  • Any plans to support circular dependencies in the near future?. details
  • I recommend to get yourself through the URL_http://java.sun.com/docs/books/tutorial/reflect/ [Sun-tutorial-on-the-subject] first.. details
  • I haven't seen another JSON serializer yet with better support for generics, collections/maps and (nested) javabeans.. details
  • I haven't seen another JSON serializer yet with better support for generics, collections/maps and (nested) javabeans.. details
  • I recommend to get yourself through the URL_http://java.sun.com/docs/books/tutorial/reflect/ [Sun-tutorial-on-the-subject] first.. details
  • I assume that by 'very performant' you mean 'fast enough for my use cases'?This because results I have seen (like [ URL_http://www.cowtowncoder.com/blog/archives/2009/12/entry_345.html ]) do not really suggest stellar performance.. details
  • I assume that by 'very performant' you mean 'fast enough for my use cases'?This because results I have seen (like [ URL_http://www.cowtowncoder.com/blog/archives/2009/12/entry_345.html ]) do not really suggest stellar performance.. details
  • I don't see much similarities between the two (which I think is good thing for GSON).. details
  • I strongly recommend using URL_http://code.google.com/p/google-gson/ [Google- Gson] to convert maps and/or collections of fullworthy javabeans to JSON and vice versa.. details
  • I strongly recommend using URL_http://code.google.com/p/google-gson/ [Google- Gson] to convert maps and/or collections of fullworthy javabeans to JSON and vice versa.. details
  • It's easy and fast (faster than GSON) for converting to and from Java objects (including CODETERM5 ) .. details
  • It's easy and fast (faster than GSON) for converting to and from Java objects (including CODETERM5 ) .. details
  • In URL_http://stackoverflow.com/questions/2496494 /library-to-encode-decode-from-json-to-java-util-map/2496528#2496528 [this- answer] you can find an example to convert a CODETERM1 to JSON and vice versa and in URL_http://stackoverflow.com/questions/1688099/converting-json- to-java/1688182#1688182 [this-answer] another example to convert a JSON string to a fullworthy Javabean (from Javabean to JSON is pretty simple with CODETERM2 .. details
  • In URL_http://stackoverflow.com/questions/2496494 /library-to-encode-decode-from-json-to-java-util-map/2496528#2496528 [this- answer] you can find an example to convert a CODETERM1 to JSON and vice versa and in URL_http://stackoverflow.com/questions/1688099/converting-json- to-java/1688182#1688182 [this-answer] another example to convert a JSON string to a fullworthy Javabean (from Javabean to JSON is pretty simple with CODETERM2 .. details
  • I recommend to pick URL_http://code.google.com/p/google-gson/ [Gson] for that.. details
  • In URL_http://stackoverflow.com/questions/2496494 /library-to-encode-decode-from-json-to-java-util-map/2496528#2496528 [this- answer] you can find an example to convert a CODETERM1 to JSON and vice versa and in URL_http://stackoverflow.com/questions/1688099/converting-json- to-java/1688182#1688182 [this-answer] another example to convert a JSON string to a fullworthy Javabean (from Javabean to JSON is pretty simple with CODETERM2 .. details
  • In URL_http://stackoverflow.com/questions/2496494 /library-to-encode-decode-from-json-to-java-util-map/2496528#2496528 [this- answer] you can find an example to convert a CODETERM1 to JSON and vice versa and in URL_http://stackoverflow.com/questions/1688099/converting-json- to-java/1688182#1688182 [this-answer] another example to convert a JSON string to a fullworthy Javabean (from Javabean to JSON is pretty simple with CODETERM2 .. details
  • I recommend to pick URL_http://code.google.com/p/google-gson/ [Gson] for that.. details
  • Gson can handle it perfectly as well.. details
  • It has excellent support for URL_http://sites.google.com/site/gson/gson-user- guide#TOC-Serializing-and-Deserializing-Gener [Generic-types] .. details
  • Jackson and Gson are the most complete Java JSON packages regarding actual data binding support; many other packages only provide primitive Map/List (or equivalent tree model) binding.Both have complete support for generic types, as well, as enough configurability for many common use cases.. details
  • It works pretty well in all my tests.The problem is that our real objects have some properties named like is_online.. details
  • GSON only maps them if they are named totally equal, it would be nice to have GSON convert the names to Java camel case isOnline.. details
  • One of the object's fields holds a string containing an escaped double quote, like this: CODESNIPPET_JAVA1 .. details
  • I love its support for generics.. details
  • I have found google-gson compelling.. details
  • I love its support for generics.. details
  • URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] It's very flexible and can handle complexities with objects in a straightforward manner.. details
  • Here's another benchmark that can highlight how fast Jackson is if compared to GSon.. details
  • Here's another benchmark that can highlight how fast Jackson is if compared to GSon.. details
  • I also tried gson: API was very object serialization oriented, and type safe, could not do what I needed simply.. details
  • But I've posted similar answers before here, you may find it useful: URL_http://stackoverflow.com/questions/1688099/converting-json-to-java/1688182#1688182 [ URL_http://stackoverflow.com/questions/1688099/converting-json-to-java/1688182 1688182] URL_http://stackoverflow.com/questions/1957406/generate-java-class-from-json/1957596#1957596 [ URL_http://stackoverflow.com/questions/1957406/generate-java-class-from-json/1957596 1957596] Gson has also an URL_http://sites.google.com/site/gson/gson-user-guide [User- Guide] , you may find it useful as well.. details
  • Ok. Like I said, I think GSON only does full document binding, but I am not 100%.For an alternative, Jackson ( URL_http://jackson.codehaus.org ) does allow incremental binding, as well as multiple other operating modes.The way that works is that you need to get a JsonParser for the main thing, iterate over main JSON array or object, and call parser.readValueAs() for actual binding.User mailing list can help with details, if documentation does not have enough pointers.. details
  • I didn't manage to get any other values than null.. details
  • Thanks for your answer, I have tried to apply the examples to the following feed: URL_http://www.stocktwits.com/streams/all.json .. details
  • Thanks.. details
  • Hi, based on ur experience, is the GSON support JDK1.4 by any chance?. details
  • Gson rocks.. details
  • I would recommend using URL_http://code.google.com/p/google-gson/ [Gson] for this.. details
  • I would recommend using URL_http://code.google.com/p/google-gson/ [Gson] for this.. details
  • Using a library such as the one described at: URL_http://www.json.org/java/ [ URL_http://www.json.org/java/ ] Looking at the description of URL_http://code.google.com/p/google-gson/ [gson] , it certainly looks like it would do the job as well.. details
  • Using a library such as the one described at: URL_http://www.json.org/java/ [ URL_http://www.json.org/java/ ] Looking at the description of URL_http://code.google.com/p/google-gson/ [gson] , it certainly looks like it would do the job as well.. details
  • GSON is a good option to convert java object to json object and vise versa.. details
  • Edit if the problem is actually in the JSON API used and you don't know which to choose, then I'd recommend to use URL_http://code.google.com/p/google-gson/ [Gson] .. details
  • It outputs the results nicely.. details
  • Hope this helps.. details
  • It outputs the results nicely.. details
  • Hope this helps.. details
  • Edit if the problem is actually in the JSON API used and you don't know which to choose, then I'd recommend to use URL_http://code.google.com/p/google-gson/ [Gson] .. details
  • Gson is great.. details
  • Gson is great.. details
  • JSONLib is awesome as a core JSON library when you just want to process all elements of a JSON.. details
  • I've used URL_http://json-lib.sourceforge.net/ [JSONLib] , URL_http://flexjson.sourceforge.net/ [FlexJSON] and URL_http://code.google.com/p/google-gson/ [Gson] all with great success.. details
  • Gson seems to be the best API to use when you want to convert a json to a Java class.. details
  • I've used URL_http://json-lib.sourceforge.net/ [JSONLib] , URL_http://flexjson.sourceforge.net/ [FlexJSON] and URL_http://code.google.com/p/google-gson/ [Gson] all with great success.. details
  • Can anyone offer some form of guidance as to how I can generate Java from this JSON string?_ URL_http://code.google.com/p/google-gson/ [Google-Gson] supports generics and nested beans.. details
  • Besides that all it's also very performant.. details
  • Our choice for GSON was based on the fact that its ideology fits our requirements, especially the full support of generic types.. details
  • Besides that all it's also very performant.. details
  • Thanks BalusC, I used Gson and the concept is quite simple to grasp.. details
  • To get good JSON-support, I would consider using a JSON processing library that does real OJM mapping (I assume Svenson does too, but additionally), such as: URL_http://jackson.codehaus.org/Tutorial [Jackson] URL_http://code.google.com/p/google-gson/ [Google-gson] Also: even if you do need to support both XML and JSON, you are IMO better off using separate libraries for these tasks -- objects (beans) to use on server- side need not be different, just serialization libs that convert to/from xml and json.. details
  • To get good JSON-support, I would consider using a JSON processing library that does real OJM mapping (I assume Svenson does too, but additionally), such as: URL_http://jackson.codehaus.org/Tutorial [Jackson] URL_http://code.google.com/p/google-gson/ [Google-gson] Also: even if you do need to support both XML and JSON, you are IMO better off using separate libraries for these tasks -- objects (beans) to use on server- side need not be different, just serialization libs that convert to/from xml and json.. details
  • [EDIT Update issues using URL_http://code.google.com/p/google-gson/ [GSON] library]I attempted to use the URL_http://code.google.com/p/google-gson/ [GSON-library] but it cannot deserialize concrete objects when I only have it expect generic super classes (XStream and Jettison handles this because type information is baked into the serialization).. details
  • [EDIT Update issues using URL_http://code.google.com/p/google-gson/ [GSON] library]I attempted to use the URL_http://code.google.com/p/google-gson/ [GSON-library] but it cannot deserialize concrete objects when I only have it expect generic super classes (XStream and Jettison handles this because type information is baked into the serialization).. details
  • Most also do not fully support the use of Java Generics.. details
  • What are you having trouble with?. details
  • Then declare a 2nd class to cover this case and catch the Exception.. details
  • i think your login2 declaration might be wrong.. details
  • @Goran tuc One doubt, what is this GSON, is that better than JSON Object.. details
  • It could be created by FORTRAN II on an 1130 and it shouldn't make any difference, so long as the JSON meets specs.. details
  • Gson will do this - if im not mistaken.. details
  • According to [this other question I found]( URL_http://stackoverflow.com/questions/10239969/using-gson-giving-error - expected-begin-array-but-was-string) that should occur if your json-data is invalid (with a [ in that case), but off the bat I can't see anything wrong with the json you posted.. details
  • I'll be damned.. details
  • Which line of your code is triggering the error?. details
  • The problem with checking for null is that the actual models contain primitives such as long.. details
  • Here is my script with the error I am getting, I really can't seem to figure out what the problem is: URL_http://pastebin.com/iR7ysMx6 .. details
  • This is the right approach, but it will probably require a lot of duplicated code.. details
  • Do you want to change the JSON output for B and C from the default that Gson provides?. details
  • I must have misunderstood how the how the JsonSerializer worked.. details
  • I'd argue that even A should not have that method because the class shouldn't care how it's represented in JSON -- that's usually the concern of some service layer handling requests.. details
  • URL_http://code.google.com/p/google-gson/source/browse/trunk/ex tras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectio nsExample.java.. details
  • The linked example uses a hard-coded JSON string instead of loading a URL, which does not answer the initial question of simply parsing JSON from a URL.. details
  • it's almost the same thing as an exclusion annotation as in it applies to all instances of that class.. details
  • If you're mapping to a class then try to naively let the Gson deserializer work, it should let the reference as null.. details
  • Once you un-marshal the JSON into a Javascript Object, the string representation lacks the quotes around property names.. details
  • Just to be sure I'm understanding your problem.. details
  • The problem with GSON, it's complicated, json-simple is far easier.. details
  • Malformed in the sense that it was not the JSON I wanted, yet it somehow was a valid JSON representation.. details
  • Can you extend com.vividsolutions.jts.geom.Point class with your own with default constructor, and serialize/deserialize them?. details
  • To the OP: You can't short of modifying the source for Gson (or writing your own printing code).. details
  • Didn't work :( this line: jobject jobject.getAsJsonObject("data"); doesn't accept a String for me.. details
  • [RuntimeTypeAdapter]( URL_http://code.google.com/p/google-gson/source/browse/trun k/extras/src/main/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.. details
  • no problem when I use fromJson I am getting a new User but the attributes from the JSOn are not being assigned, I read the documentation for GSON and was led to believe this was automatic?. details
  • So far it seems Gson expects a static type to be supplied rather than type Object.. details
  • You're right, I missed a name field.. details
  • Note that serialization of class names and deserialization (from user input) using Class.forName can present security implications in some situations, and is thus discouraged by the Gson dev team.. details
  • Note that serialization of class names and deserialization (from user input) using Class.forName can present security implications in some situations, and is thus discouraged by the Gson dev team.. details
  • And their docs are out of date ;) If you test it with the current version of Gson you'll find it now handles even private non-static inner classes.. details
  • Hmm, are you sure Gson works this way for arbitrary JSON field names?. details
  • Argh, this is an awful suggestion, it uses Exceptions for flow control!!. details
  • The 2.1 version of Gson now has a default access constructor... hence we can't use the code above... instead now the TypeToken class has the following method: public static TypeToken get(Type type) { return new TypeToken(type); }But in this case... how could we provide the correct type to it??. details
  • That is why I am not sure if they are using Gson on their problems.. details
  • It might "fix" your problem too: URL_https://code.google.com/p/google-gson/ .. details
  • That's really not how you use JsonReader, which is a fairly low-level JSON API.. details
  • I swear I already saw this exact question today.... details
  • The line Map map new HashMap(); is unecessary, as you are creating a HashMap object that you never use.. details
  • I don't get any problems with Gson Map o new Gson().fromJson(data, Map.class); (instead of Map you can use your class).. details
  • My problem is more, if there is a structure issue somewhere in the json is there a way to "skip and continue" in GSON ?. details
  • I'm definitely a fan of GSON but it's hardly the JSON library for Java.. details
  • you may create a ExclusionStrategy, see here : URL_http://stackoverflow.com/questions/4802887/gson-how-to-exclude-specific - fields-from-serialization-without-annotations.. details
  • @MikO err...i have a funny question here : URL_http://stackoverflow.com/questions/19028616/how-to-read-json-variable-that - use-number-for-its-name-with-gson Sorry its my first time playing with GSON :D.. details
  • Or do I have to look at my problem from a completely different perspective to find the right solution?. details
  • @Cruncher I was thinking about regex but I would like to avoid using it if possible.. details
  • So you have multiple json schema coming from the same source?. details
  • Now I have to write my own crap serializer or switch library: HashMap mp new Gson().fromJson( "{\"key\": 1}", HashMap.class );String json new Gson().toJson( mp ); // {"key":1.0} ... notice the double 1.0 instead of Integer 1.. details
  • right the json is invalid (jslint), let me correct the question, Done corrected.. details
  • The problem with checking for null is that the actual models contain primitives such as long.. details
  • @RudolphEst, Unfortunately Google does not have any libraries for Python.. details
  • If you're not happy with the default behavior of Gson for A, B or C, the proper way is indeed to write TypeAdapters.. details
  • See the bug described in URL_http://stackoverflow.com/questions/13244769/gson-polymorphic-serialization .. details
  • If so, there's no problem... Gson can see that the type of the field is List statically and deserialize the list based on that.. details
  • All the ugly not typical java styled code is hidden in the data classes and nobody from outside will see it.. details
  • I was having a little trouble with the status attribute.. details
  • GSON looked promising but it still suffers from the problem of not being able to deserialize a collection or single element of a concrete type when all it knows is that is the parent class.For example in a generic messaging system all messages extend the base Message class and the message passing system is sent a list of concrete Message objects in JSON format.. details
  • I think I should take this second approach because another concern is that my JSON output I have presently is very tightly coupled to the actual class implementation, and I'm also concerned about versioning (it could get messy if JSON file loaded into a newer app vesion where the class structures have changed).. details
  • I never tried this method, but if you let me know how to change Loginactivity then I can try it and see its solving my problem or not.. details
  • @Perception Is is invalid because of duplicate keys "student"?. details
  • I believe this captures the spirit of JSON much better than a "manual parser" approach.. details
  • Yes, I'm very familiar with Gson, and Jersey already uses Jackson, but converting JSON to and from POJOs is only one part of the problem, I'm looking for an alternative to Jersey, which is a framework for building REST-HTTP APIs.. details
  • Why do you use default access modifier?. details
  • Saying you've looked around isn't enough.. details
  • The problem with checking for null is that the actual models contain primitives such as long.. details
  • ^this, but would this method be faster/less costly?. details
  • That'l be the problem.. such a simple mistake!.. details
  • As I said I'd like to be able to know the attribute name, not the wrong enum value, not the enum name, but the class field name.. details
  • In my case I wanted to remove all false booleans (the entire element), this is unfortunately not possible using this method.. details
  • The problem I think is that it's not compatible with GAE.. details
  • I tried private Map nodes; and it still failed.. details
  • The problem is not the inizialitation of Map, Gson does this for you!. details
  • But imagine that I have many more properties inside both Complex and Simple class.. then I'd have to manually deserialize each field (..get("map");) essentially losing all the auto-magic GSON gives me.. details
  • sorry, TypeToken is not abstract.. details
  • Once you un-marshal the JSON into a Javascript Object, the string representation lacks the quotes around property names.. details
  • You could get this error if the Content-Type is not set properly.. details
  • The date format issue is annoying (there's no JSON date format standard, so different vendors use diff formats) but I'm only aware of incompatibility with Microsoft web server APIs, so probably limited actual problems.. details
  • I doubt it.. details
  • I don't get any problems with Gson Map o new Gson().fromJson(data, Map.class); (instead of Map you can use your class).. details
  • I am really lost :(.. details
  • java) is now complete, unfortunately it doesn't look like it's in Gson core yet.. details
  • Thanks :) currently looking at Gson, I'm using this json-simple lib, which I suspect is lacking a few good feature I need.. details
  • no problem when I use fromJson I am getting a new User but the attributes from the JSOn are not being assigned, I read the documentation for GSON and was led to believe this was automatic?. details
  • sorry, TypeToken is not abstract.. details
  • See this link for that URL_http://stackoverflow.com/questions/6873020/gson-date - format You will have to change the default date format for GSON.. details
  • I haven't checked deserialization yet, but for serialization there's a problem.. details
  • It seems that there's a problem while parsing with Gson, can you provide the code where you actually deserialize the JSON response?. details
  • The problem I think is that it's not compatible with GAE.. details
  • What's wrong with using jsonlint then?. details
  • It's such a pity, Well I will be using Gson, It would be useful to make Gson a JSR.. details
  • The problem is involving those code.. details
  • It's a bit trickier than that because totalResults is inside of an object that is inside of an array called data.. details
  • If GSON does not work with correct JSON, then it is a bug.. details
  • After this error occurs, "com.google.gson.ParseException: Encountered "\"" at line 1, column 113.. details
  • Gson leniency mode is soft in some regards, and latest supposed bug fixes have evidently not held.. details
  • Just to be sure I'm understanding your problem.. details
  • Sorry, this is not an answer to my question.. details
  • You do the instanceof Integer test inside the if (jsonPrimitive.isNumber()) block?. details
  • I really wish frameworks did not add these (generally useless) layers of extra wrapping -- they seem to be nr 1 source of confusion for developers.. details
  • Heh I meant MyJson instead of T sorry.. details
  • defaultPrettyPrintingWriter() is no longer available (even as a deprecated method) on the ObjectMapper class.. details
  • Beware of GSON.. details
  • The number of items in the two JSON lists are relatively few, so I wouldn't be concerned about excessive memory consumption.. details
  • If you get the expected -1 when reading directly from the InputStreamReader, I think this is a bug in the gson lib.. details
  • I understand the JSON structure is not under your control, but you're misunderstanding what you have: you do not have an array of JSONResponse objects, but an array of Playlists, Track, etc... so, no problem, you'll just have to implement your own deserializer; here's an [example]( URL_http://stackoverflow.com/questions/6096940/how-do-i-write-a-custom - json-deserializer-for-gson).. details
  • ok, I am a new guy here, so the answer may be a little bit simple.I'll post another answer.. details
  • There's not a "problem" with Jersey or Gson ... the web service is basically broken and not returning consistently.. details
  • It indeed parses the code, however, my previous problem was a malformed JSON.. details
  • this could work (particularly after removing the brackets at the classes definition), but it's not flexible enough as it seems that the JSON object can have an arbitrary number of elements for the keys name, sites, places and images (and for the contents of the latter too).. details
  • You have the JSON decomposed into a tree structure.. details
  • what the problem?. details
  • in original file there is more then one object inside Lyrics ...changed it to List but error is still the same .... details
  • Jackson works, but I personally find Jackson awful to work with and MUCH prefer GSON.. details
  • Your JSON is invalid (you can verify it with [jsonlint]( URL_http://jsonlint.com) .. details
  • Gson is very slow.. details
  • Your main problem would be that some encoders (dunno about Gson) gratuitously escape other characters, and you'd have to undo those escapes on the other end.. details
  • Also, to avoid your problem about code refactoring, I tend to use [Bridge Pattern]( URL_http://en.wikipedia.org/wiki/Bridge_pattern ) to avoid having a direct usage of third party libraries on my code.. details
  • @David : I am curious about your use-case demanding that sort of JSON structure.. details
  • unfortunately, there is no way i can change that output.. details
  • defaultPrettyPrintingWriter() is no longer available (even as a deprecated method) on the ObjectMapper class.. details
  • @eflat it seems to depend on object size and how you handle the mobile phone memory etc, not only gson/jackson etc.. details
  • This is wrong.. details
  • The [Gson Javadoc for JsonElement]( URL_http://google-gson.googlecode.com/svn/trunk /gson/docs/javadocs/index.html?com/google/gson/JsonElement.html) does not mention that class implementing serializable so I could see that being a problem.. details
  • Sorry, I was pretty sure but I checked and I was wrong :).. details
  • I check the gson document, I think the problem is the collection member of FBUserVideoWatches, and I guess [JsonParser]( URL_https://code.google.com/p /google-gson/source/browse/trunk/extras/src/main/java/com/google/gson/extras/e xamples/rawcollections/RawCollectionsExample.java) may give you some hints.. details
  • If GSON does not work with correct JSON, then it is a bug.. details
  • As this: URL_https://code.google.com/p/google - gson/issues/detail?id=534&q=static%20inner%20classes, you can deserialize no- static inner classes BUT you cannot access to outer instance.. details
  • @PrathameshTalathi : you can see [this]( URL_https://sites.google.com/site/gson /gson-user-guide#TOC-Object-Examples) Gson API but my preference is use android default JsonParser is better from any other third party lab until you have specific requirement.. details
  • The problem I think is that it's not compatible with GAE.. details
  • ill give it a go.. details
  • in original file there is more then one object inside Lyrics ...changed it to List but error is still the same .... details
  • Then declare a 2nd class to cover this case and catch the Exception.. details
  • (you can replace the plain Gson instance I used for new GsonBuilder().disableHtmlEscaping().create() as well).. details
  • Enter "gson" in your browser search bar, click on the first result google returns, click on "user guide", click on "Serializing and Deserializing generic types", read the solution to your problem.. details
  • I doubt you've exhausted Google :).. details
  • They did a static class since it was a inner class (they kept example compact and since Gson does not do well with non-static inner classes).. details
  • Ok so I create the classes but how do I provide a json and Response.class to gson?Sorry I am still trying to get my head around all of this.. details
  • Otherwise it is very difficult to know what to look for.. details
  • Sorry, this is not an answer to my question.. details
  • this resulted into error: Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2.. details
  • I'm sorry.. details
  • You could get this error if the Content-Type is not set properly.. details
  • Unfortunately, this solution cannot be done.. details
  • How is this ambiguous, vague, incomplete, overly broad, or rhetorical?. details
  • It seems that there's a problem while parsing with Gson, can you provide the code where you actually deserialize the JSON response?. details
  • I've tried to preverify the class but got this error:Error preverifying class com.google.gson.annotations.Expose java/lang/NoClassDefFoundError: java/lang/annotation/Annotation.. details
  • That avoids any name clashes as well.. details
  • There's not a "problem" with Jersey or Gson ... the web service is basically broken and not returning consistently.. details
  • Well given that the error is in the column where the document field starts, why don't you try make a class to cast it, instead of use a String?. details
  • I have tried that and it doesn't work :\ I'm using gson 2.0.2.. details
  • The problem I think is that it's not compatible with GAE.. details
  • The problem here is that Class B would not be implementing MyInterface.. details
  • I believe Gson, by default, injects the Fields directly, without using the accessors.. details
  • According to [this other question I found]( URL_http://stackoverflow.com/questions/10239969/using-gson-giving-error - expected-begin-array-but-was-string) that should occur if your json-data is invalid (with a [ in that case), but off the bat I can't see anything wrong with the json you posted.. details
  • My problem is more, if there is a structure issue somewhere in the json is there a way to "skip and continue" in GSON ?. details
  • The problem with checking for null is that the actual models contain primitives such as long.. details
  • I had an error : "com.google.gson.JsonParseException: Type information is unavailable, and the target object is not a primitive:".. details
  • Just as an FYI, Gson has no problem with non-static inner classes.. details
  • Sir i tried with follwoing code but Giving Type Mismatch error "public static List getCartList() { List cartList new Vector(cartMap.keySet().size()); for(Product p : cartMap.keySet()) { cartList.add(p); } Gson gson new Gson(); // convert your list to json String jsonCartList gson.toJson(cartList); // print your generated json System.out.println("jsonCartList: " + jsonCartList); return jsonCartList; }".. details
  • Unfortunately, although you can convert JSON Objects to to DBObjects, Mongo can't handle JSONArrays, (sorry - should have made it clear that I'm using gson so I can make use of JSONArrays).. details
  • That didn't work, I tried with GSON (without RestTemplate) and it also failed.... details
  • I have this in my User class: public class UserT { String userID null; String FirstName null; String LastName null; String ISOcountrycode null; String Telephone null; boolean isMale false; String Email null; Date Birthdate null; boolean isObject false;.. details
  • [RuntimeTypeAdapter]( URL_http://code.google.com/p/google-gson/source/browse/trun k/extras/src/main/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.. details
  • URL_http://code.google.com/p/google-gson/source/browse/trunk/ex tras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectio nsExample.java.. details
  • But if you use Java 1.5 you could use Long instead of long and check Long field was filled by Gson.. details
  • Thanks :) currently looking at Gson, I'm using this json-simple lib, which I suspect is lacking a few good feature I need.. details
  • Just a little addition: To make it work, make sure your classes are are NOT defined internally (sub-class).. details
  • My problem is more, if there is a structure issue somewhere in the json is there a way to "skip and continue" in GSON ?. details
  • @Tony Stark-Just see this link URL_http://rishabhsays.wordpress.com/2011/02/24 /parsing-list-of-json-objects-with-gson/.. details
  • i misread the Gson answer below.. details
  • unfortunately, there is no way i can change that output.. details
  • If so, there's no problem... Gson can see that the type of the field is List statically and deserialize the list based on that.. details
  • That'l be the problem.. such a simple mistake!.. details
  • [Relevant source]( URL_https://code.google.com/p/google-gson/source/browse/trunk/gs on/src/main/java/com/google/gson/stream/JsonWriter.java).. details
  • This is the right approach, but it will probably require a lot of duplicated code.. details
  • Only classes, without insignificant properties.. details
  • Let me know if you understand how to map your problem to the other answer I gave.. details
  • ...okay, so what's the problem?. details
  • I'm rather new to GSON and it's very confusing to me.. details
  • I googled lots of phrases with "mapping" and "converting" in them, but as you can imagine, that yields lots of results, but none of them seems to belong to the problem I have.. details
  • Can you put the error message in the post.. details
  • Your main problem would be that some encoders (dunno about Gson) gratuitously escape other characters, and you'd have to undo those escapes on the other end.. details
  • Why don't you just do a strJSON.replaceAll("(late|populate|convicts)", "_RARE_").. details
  • Here is my script with the error I am getting, I really can't seem to figure out what the problem is: URL_http://pastebin.com/iR7ysMx6 .. details
  • The problem is not the inizialitation of Map, Gson does this for you!. details
  • Gson leniency mode is soft in some regards, and latest supposed bug fixes have evidently not held.. details
  • @Tsunaze which line from the above code gave that error?. details
  • GSon is not magical, it can't guess for you :).. details
  • It indeed parses the code, however, my previous problem was a malformed JSON.. details
  • I never tried this method, but if you let me know how to change Loginactivity then I can try it and see its solving my problem or not.. details
  • Heh I meant MyJson instead of T sorry.. details
  • Which line of your code is triggering the error?. details
  • [Relevant source]( URL_https://code.google.com/p/google-gson/source/browse/trunk/gs on/src/main/java/com/google/gson/stream/JsonWriter.java).. details
  • Can you get some idea out of that where I went wrong on creation of POJO.. details
  • For point 1, this might help (although it looks like bad news for you)... URL_http://stackoverflow.com/questions/6425881/upgrade-path-for-json-file-format .. details
  • It might "fix" your problem too: URL_https://code.google.com/p/google-gson/ .. details
  • what the problem?. details
  • It is quite fast and flexible and offers the possibility to exclude (see URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Excluding-Fields-From-Serialization-and-Deserialization [CODETERM1] ) or rename fields (see URL_https://sites.google.com/site/gson/gson-user-guide#TOC- JSON-Field-Naming-Support [CODETERM2] ) in the representation.. details
  • Well, when you put it like that I guess it is a little confusing.. details
  • What did I do wrong this time?. details
  • Google's Gson library does this by default and I was just wondering if there was some way Jackson could do the same thing.. details
  • EDIT As Brian Roach pointed out in comments, it's not needed anymore for inner classes to be static to work well with Gson.. details
  • Second**, Gson does not like inner classes so much, unless they are declared static.. details
  • If you don't like inner static classes you can always put CODETERM1 and CODETERM2 into separate files (without static keyword, of course).. details
  • Sorry I can't give you a more specific answer.. details
  • Sorry I can't give you a more specific answer.. details
  • But this time my JSON is much complex.. details
  • If you cannot edit your JSON syntax, you'll have to manually parse the JSON data into the structure you're trying to create, which will be somewhat tedious and involved.. details
  • As an aside, you call your CODETERM3 object CODETERM4 , which is going to be very confusing; avoid using names like "list" for objects that aren't lists.. details
  • and not for transforming arbitrary JSON into arbitrary Java.. details
  • after googling the issue a real long time this URL_http://stackoverflow.com/questions/5800433/polymorphism-with-gson [Polymorphism-with-gson] ha come to be a solution but I wonder if in my case I should create adaptors for each of the hierarchical classes(in the exmpl there is only one hierarchy).. details
  • where a simply implements(for now): CODESNIPPET_JAVA3 .. details
  • My problem is than all my object are store as independent object (without any reference).As you can see map contains stations and lines.. details
  • I have made them into static nested class definitions.. details
  • I'm looking for a general solution for that, I have a lot of such complex objects and I don't want to implement many custom deserializers for each of them.. details
  • What about the JSON is "incorrect"?. details
  • I dont't know about performance compared to Jackson, but it's hard to be simpler than this... Gson is a stable and widely used library.. details
  • I dont't know about performance compared to Jackson, but it's hard to be simpler than this... Gson is a stable and widely used library.. details
  • Just to be sure, can you exclude problem with the console?. details
  • Just to be sure, can you exclude problem with the console?. details
  • Still as of version 2.2 I still can't specify a path to field to exclude.. details
  • My indentation system is quite naive, I put indentation only to show the correspondence to your JSON, maybe you do not even need that.. details
  • Come to think of it, how does GSON know that body_src should map to sourceLanguage?. details
  • Anycase, Gson does not work well with inner classes unless they are static.. details
  • Note also that I avoided to parse the date as date, you need to specify a custom date format for that, but it's beyond the scope of this question.. details
  • This is why Gson complains.. details
  • Update for new Gson lib: You now can parse nested Json to Map directly (as you can do in iOS with some Json libs) , but you should be aware in case you try to parse Json to CODETERM1 type: if you use HashMap it will raise an exception.. details
  • How can I reliably add my json string as an attribute to it without having to build it manually (ie avoiding tedious string concatenation)?. details
  • EDIT: Here's the code code, but it's kinda pointless, since the exception is being thrown because of the parsing process.. details
  • It's regarding the CODETERM1 method and how it refuses to interpret some classes as arrays.. details
  • And I have tried having more objects in the array and I still get the same error message!. details
  • And I have tried having more objects in the array and I still get the same error message!. details
  • GSON parsing fromJSON regarding arrays of objects exception.. details
  • I get the error that GSON was expecting an Object and NOT an Array (before the "[" token of messages).. details
  • EDIT: Here's the code code, but it's kinda pointless, since the exception is being thrown because of the parsing process.. details
  • Actually your were getting error CODETERM1 because gson was expecting object not the string, also it is an object in json, you have wrong mapped your classes in Bean class, and you have not posted the Bean,Simple class glue code here.. details
  • I am facing a problem about the GSON json to Java.. details
  • So I list my problem here.I am trying to get the data there is a Map in json but I am not able to retrieve the data .. details
  • In my log I am able to see that only this much data is coming then it throws the exception .. details
  • In my log I am able to see that only this much data is coming then it throws the exception .. details
  • So I list my problem here.I am trying to get the data there is a Map in json but I am not able to retrieve the data .. details
  • Gson now by default appears to have the behavior that Kevin Dolan is going for in his code snippet.. details
  • If you look carefully to Gson exception as" CODETERM1 ".. details
  • Just you need a little change in JsonResponse class as below CODESNIPPET_JAVA1 .. details
  • Also, if your objects end up being too complicated, remember you can always implement your own JSONDeserializer class and register it at the GSONBuilder object right before you call create() on it.. details
  • But I get the error: 11-20 19:24:55.210: E/AndroidRuntime(5432): FATAL EXCEPTION: main 11-20 19:24:55.210: E/AndroidRuntime(5432): com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 13 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gso n.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapte rFactory.java:176) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.g son.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFac tory.java:93) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.i nternal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFa ctory.java:172) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson .internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrappe r.java:40) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.Gson.fromJson(Gson.java:803) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.Gson.fromJson(Gson.java:768) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.Gson.fromJson(Gson.java:717) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.Gson.fromJson(Gson.java:689) 11-20 19:24:55.210: 11-20 19:24:55.210: E/AndroidRuntime(5432): at android.os.ResultReceiver$MyRunnable.run(ResultReceiver.java:43) 11-20 19:24:55.210: E/AndroidRuntime(5432): at android.os.Handler.handleCallback(Handler.java:587) 11-20 19:24:55.210: E/AndroidRuntime(5432): at android.os.Handler.dispatchMessage(Handler.java:92) 11-20 19:24:55.210: E/AndroidRuntime(5432): at android.os.Looper.loop(Looper.java:130) 11-20 19:24:55.210: E/AndroidRuntime(5432): at android.app.ActivityThread.main(ActivityThread.java:3687) 11-20 19:24:55.210: E/AndroidRuntime(5432): at java.lang.reflect.Method.invokeNative(Native Method) 11-20 19:24:55.210: E/AndroidRuntime(5432): at java.lang.reflect.Method.invoke(Method.java:507) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.android.internal.os.ZygoteInit$MethodAndArgsCal ler.run(ZygoteInit.java:867) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 11-20 19:24:55.210: E/AndroidRuntime(5432): at dalvik.system.NativeStart.main(Native Method) 11-20 19:24:55.210: E/AndroidRuntime(5432): Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 13 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:374) 11-20 19:24:55.210: E/AndroidRuntime(5432): at com.google.gson.internal.bind.Reflect iveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165) 11-20 19:24:55.210: E/AndroidRuntime(5432): ... 21 more P.S.. details
  • Some Items in json response might be missed.. details
  • So what is the problem and how can I deserialize this JSON?. details
  • I'am struggling with a problem to parse a JSON with GSON which contains lists as values.. details
  • I'am struggling with a problem to parse a JSON with GSON which contains lists as values.. details
  • GSon requires a default constructor so you might have to come up with another method to feed your ProductModel.. details
  • Here is a try, but it creates a compilation error: CODESNIPPET_JAVA1 .. details
  • I want to create a complex object structure with Json, but i cant create this structure, since i get this exception: Register an InstanceCreator with Gson for this type may fix this problem.. details
  • I have found this introduction to this topic: URL_http://google-gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/com/google/ gson/InstanceCreator.html [ URL_http://google-gson.googlecode.com/svn/tags/1.2.3/do cs/javadocs/com/google/gson/InstanceCreator.html] Here is the java class, but i dont now, how i can create the default constructor in the right way.. details
  • I want to create a complex object structure with Json, but i cant create this structure, since i get this exception: Register an InstanceCreator with Gson for this type may fix this problem.. details
  • I've done this a dozen times without a problem.. details
  • I've taken a sample json string to avoid any problems with the remote server file.. details
  • I feel like I'm missing something really dumb here... .. details
  • I resorted to the format approach as my json string was very complicated and I had to extract each number before I could use it for display purpose.. details
  • You have a problem with CODETERM1 field, Gson expects an object but you provide an array (with an object only).. details
  • I am trying to parse JSon File and I cannot figure my mistake (smaller examples work flawlessly) Song.json CODESNIPPET_JAVA1 .. details
  • SongType.java: (is rather long) URL_http://pastebin.com/uaEY7dty [ URL_http://pastebin.com/uaEY7dty ] When I do as usualy: CODESNIPPET_JAVA2 .. details
  • GSON deserialization: nested JSon file error.. details
  • SongType.java: (is rather long) URL_http://pastebin.com/uaEY7dty [ URL_http://pastebin.com/uaEY7dty ] When I do as usualy: CODESNIPPET_JAVA2 .. details
  • It crashes.... details
  • I was looking at the ExclusionStrategy().. details
  • It may work on your platform; but it can easily fail on others; hence it is broken.. details
  • It may work on your platform; but it can easily fail on others; hence it is broken.. details
  • It may work on your platform; but it can easily fail on others; hence it is broken.. details
  • Gson does have faster startup time, however; and version 2.1 is ok (earlier versions were very slow).. details
  • Gson does have faster startup time, however; and version 2.1 is ok (earlier versions were very slow).. details
  • Above code is buggy -- does not specify character encoding to use for FileReader, so will probably barf on non-ASCII input.. details
  • Gson won't help -- tree model is heavy-weight and about same size on different libs.. details
  • Gson won't help -- tree model is heavy-weight and about same size on different libs.. details
  • It seems to be a problem for the Gson.. details
  • I've been searching and the answers do not match my specific problem.. details
  • It seems to be a problem for the Gson.. details
  • ): CODESNIPPET_JAVA5 .. details
  • I've been searching and the answers do not match my specific problem.. details
  • Problem is, there is absolutely no response after printing the raw JSON output.. details
  • Problem is, there is absolutely no response after printing the raw JSON output.. details
  • Ok I found my mistake.. details
  • I use a response object called list wrapper, so that if there are any errors I can pass them along.. details
  • gsonBuilder is an error when I write the topic.. details
  • If that's actually compiling then you have another GsonBuilder you previously created and are using it by mistake.. details
  • Now when i debugged it , i found that the returned list had references of ClientLookup as ClientLookup$$Enhance... because of which is causing the problem.I tried to remove the proxies also but didn help.This is what I had tried to remove the proxy (found at one SO results) CODESNIPPET_JAVA3 .. details
  • Im trying to convert a collection (obtained from Hibernate) to json string using Gson for use in my restful service.But, the service is giving me http 500 error.. details
  • Now when i debugged it , i found that the returned list had references of ClientLookup as ClientLookup$$Enhance... because of which is causing the problem.I tried to remove the proxies also but didn help.This is what I had tried to remove the proxy (found at one SO results) CODESNIPPET_JAVA3 .. details
  • I tried using the following code as given in URL_http://stackoverflow.com/questions/9598707/gson-throwing-expected-begin- object-but-was-begin-array?rq=1 [this-answer] , but I got the same exception as the one mentioned in that question.. details
  • If an error, which one?. details
  • By curiosity, if you try and read the tree (using mapper.readTree) to a JsonNode, does it work or do you also have an error?. details
  • By curiosity, if you try and read the tree (using mapper.readTree) to a JsonNode, does it work or do you also have an error?. details
  • The system I'm communicating with uses Gson and turns ints into floats, which don't convert back to ints since there's a loss of precision.. details
  • By default, Gson will not give you the JSON string you want, you have to customize Gson with a specific serializer for you enum.. details
  • Pay attention that JSON you posted is invalid, a colon is needed.. details
  • Since I do not have your db, I built a list by hands and this is my result (I formatted the console result): CODESNIPPET_JAVA3 .. details
  • If source and destination are not empty objects, you should use my serialization code.. details
  • I think that my implementation can refined a bit to avoid map duplications, but I left them to you (or to future editor, if any).. details
  • You have just to remember to put a new subclass into the maps (the exception reminds you of that).. details
  • Some explanations: the trick is done by another Gson inside the serializer/deserializer.. details
  • You have just to remember to put a new subclass into the maps (the exception reminds you of that).. details
  • I realize I could use an adapter for this, but the problem is that I'm serializing a collection of base class type ObixBaseObj.. details
  • Please tell me where I make mistake.. details
  • I have a problem with deserializing following json: CODESNIPPET_JAVA1 .. details
  • Parsing a complex Json Object using GSON in Java.. details
  • I have a very long JSON to parse with Gson, but for brevity I have trimmed it to this example: CODESNIPPET_JAVA1 .. details
  • I would consider not requiring annotations to be a feature of GSON, not a deficiency (which you have listed at least 3 times above).. details
  • I am using GSON, and dont know how to get around this particular problem, of "blob" sometimes being a string and sometimes an object.. details
  • As Gson documentation says: Gson can serialize static nested classes quite easily.. details
  • Gson can also deserialize static nested classes.. details
  • You can address this problem by either making the inner class static or by providing a custom InstanceCreator for it.. details
  • Changing B to a static inner class is not possible since your method needs a reference to the outer class in CODETERM1 , so, I've tried to solve your problem with an CODETERM2 but solution was a bit ugly, so I propose you to use a custom deserialized.. details
  • I changed your CODETERM3 class a little, making items public to make easier to create the example I show you.. details
  • My deserializer lacks of null cases management, you should complete for null JSON or null fields.. details
  • My deserializer lacks of null cases management, you should complete for null JSON or null fields.. details
  • But, after serializing and deserializing, CODETERM6 fails with a CODETERM7 .. details
  • This happens because the inner class CODETERM8 doesnt have a reference to outer class CODETERM9 anymore, so, CODETERM10 fails.. details
  • GSON serialisation - how to exclude some fields from serialisation, but not deserialisation.. details
  • For example if I serialize something basic like CODETERM3 it will output garbage characters.. details
  • I thought the CODETERM2 charset would do the trick but I am not really sure what part of the code does not allow japanese characters to be serialized.. details
  • But I am getting a garbage CODETERM4 .. details
  • I'm having an annoying problem with GSON.. details
  • "my web app will return null if the Umlauts are not converted somehow" so the problem is with web-app.. details
  • So eventually, I would like the new data source to be a CODETERM6 Object.. details
  • However, I get an error CODETERM4 which makes me think that I am passing a CODETERM5 , where I should be passing a JSON object.. details
  • Gson deserialize complex object with recursive dependencies.. details
  • From JSON official grammar ( URL_http://www.ietf.org/rfc/rfc4627.txt [ URL_http://www.ietf.org/rfc/rfc4627.txt ] ): 1.. details
  • Hack a bit your "Json string" since it's not a valid Json (see more details below).. details
  • I used Gson before and everything worked fine, but it is too slow.. details
  • However Gson is quite flexible to add a custom behavior to get what you need, you should start reading URL_https://code.google.com/p/google-gson/issues/deta il?can=2&q=232&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Sum mary&id=232#makechanges [Read-and-write-Json-properties-using- methods-(ie.-getters-&-setters)-bug] Another way to calculate your CODETERM2 list could be using reflection and checking if every field of your POJO is null or not.. details
  • However Gson is quite flexible to add a custom behavior to get what you need, you should start reading URL_https://code.google.com/p/google-gson/issues/deta il?can=2&q=232&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Sum mary&id=232#makechanges [Read-and-write-Json-properties-using- methods-(ie.-getters-&-setters)-bug] Another way to calculate your CODETERM2 list could be using reflection and checking if every field of your POJO is null or not.. details
  • However Gson is quite flexible to add a custom behavior to get what you need, you should start reading URL_https://code.google.com/p/google-gson/issues/deta il?can=2&q=232&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Sum mary&id=232#makechanges [Read-and-write-Json-properties-using- methods-(ie.-getters-&-setters)-bug] Another way to calculate your CODETERM2 list could be using reflection and checking if every field of your POJO is null or not.. details
  • However Gson is quite flexible to add a custom behavior to get what you need, you should start reading URL_https://code.google.com/p/google-gson/issues/deta il?can=2&q=232&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Sum mary&id=232#makechanges [Read-and-write-Json-properties-using- methods-(ie.-getters-&-setters)-bug] Another way to calculate your CODETERM2 list could be using reflection and checking if every field of your POJO is null or not.. details
  • and here shows my error CODESNIPPET_JAVA3 .. details
  • I only dealt with the CODETERM2 data as I assumed it was the tricky implementation in question.. details
  • Unfortunately it complaints at the last line that the method fromJson(String, Type) in the type Gson is not applicable for the arguments (JSONArray, Type).. details
  • but if returns lists of users I get Exception.. details
  • When it is return single user I can use following java class to covert json to java CODESNIPPET_JAVA3 .. details
  • We went with gson first and when switching to jackson it was nearly a drop-in replacement, they were both equally easy to use, and orders of magnitude easier to use than JSONObject.. details
  • I have a question about GSON library Here is my source code of a class CODESNIPPET_JAVA1 .. details
  • But I get this exception: CODESNIPPET_JAVA4 .. details
  • I think the trailing 'Z' is bad.. details
  • GSON will automatically escape the string when marshalling it.You don't have to worry about it.. details
  • However, i have a problem when i want to access the CODETERM3 variable in the CODETERM4 Class because all i have is a CODETERM5 Class.. details
  • GSON has the same restriction.. details
  • Gson create CODETERM5 using CODETERM6 method (roughly calling CODETERM7 ), if you want pass some values during construction of object, you need to use an URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javad ocs/com/google/gson/InstanceCreator.html [InstanceCreator] .. details
  • So I suspect that CODETERM2 is defined somewhere but is not initialized since I checked that the default constructor is called.. details
  • So you _should always make sure Gson-constructed classes have a default constructor_.. details
  • This will actually fail on some platforms (I have seen posts to that effect about Android allocations failing).. details
  • It may be that putting the code you showed in the default constructor worked not because you moved the code around, but because you had a default constructor at all.. details
  • Refer to this post as per the information provided in the question this should solve your problem URL_http://stackoverflow.com/questions/18529664/json- parsing-with-gson-with-data-and-arrays [Json-parsing-with-Gson-with-data-and- arrays] .. details
  • Not able to find out where is the error .. details
  • Not able to find out where is the error .. details
  • But I'm getting problem in iterating the list item.. details
  • Unfortunately I cannot figure out how to handle nested arrays within the json.. details
  • I get the error message; CODESNIPPET_JAVA4 .. details
  • @Renato Lochetti: it worked after commenting {ret.put("events", eventArrayList);} now am confused was the ArrayList<ArrayList> causing this problem, is there a way to resolve this.. details
  • @Renato Lochetti: it worked after commenting {ret.put("events", eventArrayList);} now am confused was the ArrayList<ArrayList> causing this problem, is there a way to resolve this.. details
  • Gson deals with it with no problem.. details
  • Gson deals with it with no problem.. details
  • I don't know how to set up the class for this complex of a response is my problem.. details
  • I don't know how to set up the class for this complex of a response is my problem.. details
  • I'm using Gson 2.2.4 and I checked the source code: that error string is not present in the library.. details
  • Failed to deserialize an object with List using Gson.. details
  • I have the following exception while deserializing an JSON to object using Gson: com.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@588722d6 failed to deserialized json object [{"time":1378911600000,"total":0},{"time":13789125000 00,"total":0},{"time":1378913400000,"total":2,"sum":130000,"avgLen":65000.0}] given the type com.google.gson.ParameterizedTypeImpl@490ca2fa The class which should represent the JSON is: CODESNIPPET_JAVA1 .. details
  • I can't understand what is the problem?. details
  • I can't understand what is the problem?. details
  • If you could put definition of CODETERM12 , this answer can be refined and hypothesis confirmed/rejected.. details
  • Unfortunately, the EnumTypeAdapter does not know anything about the context it's called, so this solution is not enough to catch the field name.. details
  • and now you have this stacktrace (changes to exception are so simple that I omitted them): CODESNIPPET_JAVA7 .. details
  • Plus I declared a custom runtime exception: CODESNIPPET_JAVA2 .. details
  • The most important part is CODETERM6 method where I catch the exception and add the field name and throw again exception.. details
  • Edit So you have to use also another CODETERM3 that I called CODETERM4 and is almost a copy of CODETERM5 and I changed a bit the exception, so: CODESNIPPET_JAVA5 .. details
  • and now you have this stacktrace (changes to exception are so simple that I omitted them): CODESNIPPET_JAVA7 .. details
  • If library get updated, you have to check again your code (a fork of source code would be the same, but at least you do not have to copy all that code).. details
  • If you customize field exclusion strategy, constructors or field naming policies you have to replicate them into the CODETERM9 since I do not find any possibility to pass them from the builder.. details
  • The most important part is CODETERM6 method where I catch the exception and add the field name and throw again exception.. details
  • If you do have a no-args constructor, Gson will use an CODETERM8 which uses that default CODETERM9 by calling CODESNIPPET_JAVA1 .. details
  • Regardless of what the Gson documentation says, if your class doesn't have an no-args constructor and you have not registered any CODETERM1 objects, then it will create an CODETERM2 (which constructs your Object) with an CODETERM3 which uses Reflection to get the CODETERM4 method of the class CODETERM5 to create your class' instance.. details
  • You might find yourself in a bad position using CODETERM11 .. details
  • So it doesn't actually need a constructor and will go around your two argument constructor.. details
  • See some examples URL_http://mishadoff.github.io/blog/java-magic- part-4-sun-dot-misc-dot-unsafe/ [here] .. details
  • If one of your requirements force you not to have a default constructor you can consider writing an URL_http://google-gson.googlecode.com/ svn/tags/1.2.3/docs/javadocs/com/google/gson/InstanceCreator.html [InstanceCreator] which allows you to deserialize instances of classes without a defined no-args constructor.. details
  • You'll need a default constructr with no-args to use Gson built-in deserialize features.. details
  • Is default no-args constructor mandatory for Gson?. details
  • URL_https://sites.google.com/site/gson/gson-user-guide [Gson-user-guide] states that we should define default no-args constructor for any class to work with Gson properly.. details
  • Even more, in the URL_http://google-gson.googlecode.com/sv n/trunk/gson/docs/javadocs/com/google/gson/InstanceCreator.html [javadoc] on Gson's CODETERM1 class said that exception will be thrown if we try to deserialize instance of class missing default constructor and we _should_ use CODETERM2 in such cases.. details
  • However, I've tried to test use Gson with class lacking default constructor and both serialization and deserialization work without any trouble.. details
  • So my question is: could I actually use Gson without need to have default constructor or there is any circumstances when it will not work?. details
  • I think an URL_https://code.google.com/p/google-gson/source/browse/trunk/extra s/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsE xample.java [example] of what you are trying to achieve is covered in the user guide.. details
  • I think an URL_https://code.google.com/p/google-gson/source/browse/trunk/extra s/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsE xample.java [example] of what you are trying to achieve is covered in the user guide.. details
  • I think an URL_https://code.google.com/p/google-gson/source/browse/trunk/extra s/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsE xample.java [example] of what you are trying to achieve is covered in the user guide.. details
  • I think an URL_https://code.google.com/p/google-gson/source/browse/trunk/extra s/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsE xample.java [example] of what you are trying to achieve is covered in the user guide.. details
  • To solve your problem I defined: CODESNIPPET_JAVA1 .. details
  • I have ran into a problem with deserializing a json where there is a field that can have multiple types and that type is determined by another field.. details
  • I have ran into a problem with deserializing a json where there is a field that can have multiple types and that type is determined by another field.. details
  • I need to have a java class that can be correlated with the Gson object in order to use it, but I'm struggling on what to with an array of similar objects whose variable CODETERM1 is not the same.. details
  • When I try to use CODETERM2 instead of CODETERM3 , I get a CODETERM4 When I try making CODETERM5 an abstract class and use subclasses for CODETERM6 and CODETERM7 , CODETERM8 tries to instantiate a CODETERM9 and errors.. details
  • Can I use generics or something else sneaky to get around this?. details
  • As you find out in the comment the problem was given by Gson, that will evaluate the JSONObject as a map.. details
  • As you find out in the comment the problem was given by Gson, that will evaluate the JSONObject as a map.. details
  • this time it's resulting into an error: CODESNIPPET_JAVA4 .. details
  • Turns out all exceptions have circular references.. details
  • It is pointless to ask for a CODETERM9 in a CODETERM10 since I need it to be able to cast it to another Java Class.. details
  • It's an exception.. details
  • Ok, I got my fatal exception: it hangs now on gson.fromJson(str, type), while using a "full bundle" (e.g.. details
  • It says:FATAL EXCEPTION: main: java.lang.RuntimeException: Failed to invoke protected java.lang.ClassLoader() with no args at com.google.gson.internal.ConstructorCo nstructor$2.construct(ConstructorConstructor.java:94) at com.google.gson.inter nal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactor y.java:162) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.re ad(ReflectiveTypeAdapterFactory.java:93).. details
  • but im getting an error: Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT I don't really know what this means so I don't know where to look for the error, hopefully someone with a better knowledge of GSON can help me?. details
  • but im getting an error: Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT I don't really know what this means so I don't know where to look for the error, hopefully someone with a better knowledge of GSON can help me?. details
  • I suspect that GSon might have a problem with that, andy ou will need to write custom deserializer and serializer (I'm sure it can be done with Gson).. details
  • As far as i can tell the problem with Gson.toJson needing type arraises only if the object you want to serialze is itself generic.. details
  • @Jeroen: sorry to be too insisting in the matter but: why?. details
  • @MiserableVariable: how can I debug using gson sources?. details
  • Did you try to debug using gson sources?. details
  • Compile is the default and should work in other people's cases, as gson isn't available from a JRE, instead it needs to be downloaded by maven.. details
  • Is there are a setting that can be enabled in Gson, that can ensure that the JSON output received is always ASCII encoded, regardless of whether UTF8 strings were present in the input?. details
  • You are using your Gson instance wrong.. details
  • I'm trying to parse a json to my java object, but I'm getting error from gson.. details
  • The error is: CODESNIPPET_JAVA1 .. details
  • Major SRP ( URL_http://en.wikipedia.org/wiki/Single_responsibility_principle ) violation.... details
  • Your java classes have to be modified a little bit for this to work: the type of CODETERM2 field in CODETERM3 has to be CODETERM4 so that CODETERM5 can find out the class of objects to populate with.. details
  • the naming of attributes/fields is inconsistent, some starts with lower case, others with uppercase.. details
  • The problem is that I get the following error while trying to parse CODETERM5 : CODESNIPPET_JAVA7 .. details
  • Incredibly, GSON types [don't implement Serializable nor Cloneable...]( URL_http://code.google.com/p/google-gson/issues/detail?id=485) .. details
  • Not sure what the problem with Gson is.. details
  • Life gets a little more complex when using generics etc., but for your example above I would expect Gson to work with little trouble.. details
  • However Gson will trivially handle objects, collections of objects etc.. details
  • what I missed there so that my code is not working?. details
  • What is the wrong with my code?. details
  • Links bellow: GSON: URL_https://sites.google.com/site/gson/gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format- gson-api/ [ URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json - format-gson-api/] URL_http://albertattard.blogspot.co.at/2009/06/practical- example-of-gson.html [ URL_http://albertattard.blogspot.co.at/2009/06/practical - example-of-gson.html] Jackson: URL_http://jackson.codehaus.org/Tutorial [ URL_http://jackson.codehaus.org/Tutorial ] URL_http://www.mkyong.com/java/how-to- convert-java-object-to-from-json-jackson/ [ URL_http://www.mkyong.com/java/how-to - convert-java-object-to-from-json-jackson/] Now you have to understand that using these tools is not just "for the lazy".. details
  • Links bellow: GSON: URL_https://sites.google.com/site/gson/gson-user-guide [ URL_https://sites.google.com/site/gson/gson-user-guide ] URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format- gson-api/ [ URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json - format-gson-api/] URL_http://albertattard.blogspot.co.at/2009/06/practical- example-of-gson.html [ URL_http://albertattard.blogspot.co.at/2009/06/practical - example-of-gson.html] Jackson: URL_http://jackson.codehaus.org/Tutorial [ URL_http://jackson.codehaus.org/Tutorial ] URL_http://www.mkyong.com/java/how-to- convert-java-object-to-from-json-jackson/ [ URL_http://www.mkyong.com/java/how-to - convert-java-object-to-from-json-jackson/] Now you have to understand that using these tools is not just "for the lazy".. details
  • Despite your help I'm struggling to relate this new information to create an "object model" as detailed in this [tutorial]( URL_http://www.javacodegeeks.com/2011/01/android-json-parsing-gson - tutorial.html).. details
  • How can avoid this exception if I can not change json string "msgArr=[null]"?. details
  • Error Stack CODESNIPPET_JAVA4 .. details
  • If you want to achieve delegation and complex serialization, look at CODETERM3 .. details
  • I am very confused, please suggest.. details
  • I know I can use exclusionStrategy in this example to achieve results but the real issue is much more complex and this was the best way for me to portray and replicate my issue.. details
  • Registering multiple adapters with GSON isn't working.. details
  • But I need them to work with both and seems that I am doing something wrong.. details
  • As I recall, Gson does handle inner class (de)serialization a little differently than Jackson.. details
  • The default behaviour that is implemented in CODETERM4 is that null object fields are ignored.. details
  • In your problem maybe you don't need to configure that.. details
  • My problem is, that I don't retrieve the expected objects, but LinkedTreeMap-objects, what causes an exception: java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to sis.hierrein.android.DDL.Core.Uniqueidentifier My classes: CODESNIPPET_JAVA1 .. details
  • My problem is, that I don't retrieve the expected objects, but LinkedTreeMap-objects, what causes an exception: java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to sis.hierrein.android.DDL.Core.Uniqueidentifier My classes: CODESNIPPET_JAVA1 .. details
  • I was struggling with this for quite a while, thinking that the problems I am having is due to not understanding Jquery/gqgird/javascript, etc.While that may still be the case, I solved the issue of displaying the data, simply by not using google gson library, and serializing a custom java bean object that maps to my data.Maybe someone can find this useful, and won't have to spend as much time: The errors I was getting was due to fact that Struts json plugin uses reflection to find properties on an object to be serialized.. details
  • It's not by exclusion, but rather by custom deserialization.. details
  • You have configured CODETERM1 object using CODETERM2 method.From URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/ gson/GsonBuilder.html#excludeFieldsWithoutExposeAnnotation%28%29 [documentation] : Configures Gson to exclude all fields from consideration for serialization or deserialization that do not have the Expose annotation.. details
  • You have configured CODETERM1 object using CODETERM2 method.From URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/ gson/GsonBuilder.html#excludeFieldsWithoutExposeAnnotation%28%29 [documentation] : Configures Gson to exclude all fields from consideration for serialization or deserialization that do not have the Expose annotation.. details
  • I understand that it could be somehow incorrect, but do not know how.Also, I tried to have a results variable in the action as JsonObject (and changing the way it obtains a value to this) CODESNIPPET_JAVA6 .. details
  • I effectively wanted the inverse, in which everything was included unless I explicitly used CODETERM5 to exclude it.. details
  • As I only had a few fields I wanted to exclude, I found the prospect of adding the annotation to every field very cumbersome.. details
  • but getting this error CODESNIPPET_JAVA4 .. details
  • What am i doing wrong?. details
  • But i get this error: CODESNIPPET_JAVA4 .. details
  • I definitely prefer this model - if Timestamp is the only thing failing to parse, better to make Timestamp deserializable, rather than manually parse the whole User object, when Gson is already perfectly capable of doing so.. details
  • @DuncanJones well, I only program for fun.. details
  • Ah, I didn't see the end of your question, sorry.. details
  • If you're dead set on Native Java you can do basically the same thing using GSON instead.. details
  • Is GSON have a "skip and continue on error" ?. details
  • GSON avoid the JsonSyntaxException return the partial mapping.. details
  • I cannot say to my custom, your app cannot start because an article has an invalide data.. details
  • I'm getting this issue, I do not want to solve that issue but find to way to say to GSON "skip errors and continue" parsing : CODESNIPPET_JAVA1 .. details
  • Is GSON have a "skip and continue on error" ?. details
  • One field in the current error is defined as string but I'm receiving an object (but again it is only one occurrence).. details
  • In my case I would have had 99.999% of the data and only my wrong field as null I know it seems not clean, but I would enable the "strict mode" for unit test or continous integration to detect problem and on production I would enable a "soft mode" so my application could start (even when the server side doing errors).. details
  • Is GSON have a "skip and continue on error" ?. details
  • I want to avoid JsonSysntaxException with GSON when there is an issue on a node and I expect at least to retrieve the partial data parsed.. details
  • have you tired GSON URL_http://code.google.com/p/google-gson/ .. details
  • have you tired GSON URL_http://code.google.com/p/google-gson/ .. details
  • However, when I try the second snippet of code into a different class that does not contain the first one I get the following error: CODESNIPPET_JAVA3 .. details
  • I guess that the creator stitched Strings together, which is the wrong way to build a structured language.. details
  • I guess that the creator stitched Strings together, which is the wrong way to build a structured language.. details
  • Just write your own tranformer to override default CODETERM1 behavior for CODETERM2 implementing the same logic of CODETERM3 and you'll be done.. details
  • I might be wrong, but I suggest you use GSON.. details
  • I might be wrong, but I suggest you use GSON.. details
  • I changed the code to Gson gson new GsonBuilder().disableHtmlEscaping().create();.. details
  • I don't really recommend this... not only is it unnecessary automatic serialization/deserialization but it will probably end up being more lines of code.. details
  • I don't really recommend this... not only is it unnecessary automatic serialization/deserialization but it will probably end up being more lines of code.. details
  • CODETERM1 returns CODETERM2 type json string But I need a following json string CODETERM3 so how can I concat age attrribute to default genarated json string ?. details
  • Sorry, it's been a couple months since I worked with Gson, so I totally missed it.. details
  • This is because Gson cannot handle polymorphism without a little help.. details
  • This is because Gson cannot handle polymorphism without a little help.. details
  • But if you feed your data to a JSON parser, like gson, you may want to replace the password string just before it gets serialized to JSON, and thus just make a plain stupid replace of the value of your string.. details
  • Error: CODESNIPPET_JAVA3 .. details
  • Json: Deserialization error while using Gson library.. details
  • Json: Deserialization error while using Gson library.. details
  • I have written this example using source code from this question: URL_http://stackoverflow.com/questions/16937544/create-json-file-with-deep-array [Create-JSON-file-with-deep-array] .. details
  • Problem is that CODETERM1 function needs a .class/type object for deserializing via introspection (understandably), but in my application, multiple type of objects can be received without knowing the .class in advance.. details
  • And force the user to do a downcast, but I'd rather avoid it.. details
  • Can you help me with this problem, am i missing something?. details
  • I have a problem with serializing and deserializing my object structure with GSON.. details
  • Complex object (de)serialization into JSON using GSON.. details
  • I have a problem with serializing and deserializing my object structure with GSON.. details
  • In order to describe the problem i'll have to describe my class structure a bit: I have a java abstract class, let's name it "A".. details
  • And i'm trying to deserialize that json using this (in another class): CODESNIPPET_JAVA2 .. details
  • So, first your class containing the JSON data (in _pseudo-code_): CODESNIPPET_JAVA2 .. details
  • json is not enought; you have a 2000 characters limitation; so , break the message into small parts; you dont know the company description length;.. details
  • Only cursory.. details
  • Only cursory.. details
  • My problem is the generic tags starts from second level.. details
  • Gson does, however, need a no-arg constructor (see the URL_https://sites.google.com/site/gson/gson-design-document [design-doc] ): Gson needs to create a dummy class instance before it can deserialize Json data into its fields ... we create class instances by invoking the parameterless constructor .... details
  • If you had a more complex inner class such as: CODESNIPPET_JAVA2 .. details
  • You can get around this issue by providing Gson with a little more information about how to construct your object: CODESNIPPET_JAVA1 .. details
  • I need something more fail-fast.. details
  • If the Enum has value ONE and TWO, when we try to parse THREE, then this value is unknown and Gson will map null instead of raising a parsing exception.. details
  • If the Enum has value ONE and TWO, when we try to parse THREE, then this value is unknown and Gson will map null instead of raising a parsing exception.. details
  • But I also need something which permits me to know the name of the field which is currently read and creates a parsing failure.. details
  • I've seen that the default TypeAdapter for Enum doesn't fit my need: CODESNIPPET_JAVA1 .. details
  • I'm getting this error when I receive only one single item in a list.. details
  • I'm getting this error when I receive only one single item in a list.. details
  • Is there any way I can avoid that?. details
  • JsonReader reader new JsonReader(new InputStreamReader(socket.getInputStream(), "UTF-8")) // it blocks at this call JsonMessage message gson.fromJson(reader,JsonMessage.class); How do I handle this disconnection in my Java application and still be able to read the JSON messages?. details
  • Register an InstanceCreator with Gson for this type may fix this problem... details
  • Also note that I have only added the attributes you need to get that concrete data, but if you add more attributes in the classes, matching the element names in the JSON, more data will be parsed... Further similar examples URL_http://stackoverflow.com/questions/15851190 /nested-json-parsing-with-gson/15851373#15851373 [here] , URL_http://stackoverflow.com/questions/16377754/parse-json-file-using- gson/16378782#16378782 [here] or URL_http://stackoverflow.com/questions/12568954/trouble-retrieving-data-from- web-service-using-gson/16124999#16124999 [here] .. details
  • Finally note that you can make your classes nested to keep your project cleaner, but if however you don't like to write so many classes, and you are sure that you only want that specific value and you won't want any value else in the future, you can use URL_http://stackoverflow.com/questions/16595493 /gson-parsing-without-a-lot-of-classes/16596863#16596863 [this-different- approach] , although I don't recommend it... .. details
  • Also note that I have only added the attributes you need to get that concrete data, but if you add more attributes in the classes, matching the element names in the JSON, more data will be parsed... Further similar examples URL_http://stackoverflow.com/questions/15851190 /nested-json-parsing-with-gson/15851373#15851373 [here] , URL_http://stackoverflow.com/questions/16377754/parse-json-file-using- gson/16378782#16378782 [here] or URL_http://stackoverflow.com/questions/12568954/trouble-retrieving-data-from- web-service-using-gson/16124999#16124999 [here] .. details
  • If you find yourself repeating the same code over and over, then you can create classes to simplify the mapping and eliminate repetition.. details
  • And also take a look at other reponses of mine URL_http://stackoverflow.com/questions/16590377/custom-json-deserializer- using-gson/16591621#16591621 [here] and URL_http://stackoverflow.com/questions/16194227/is-it-possible-to-deserialize- json-property-names-with-periods-as-a-nested-objec/16196123#16196123 [here] ... and if you still have doubts, comment.. details
  • That said, in my opinion it is much easier for you to parse it creating the correspondent classes, even more taking into account the simplicity of your JSON response... With the usual approach you only have to write some super- simple classes, however, writing a custom deserializer, although is not that complex, it will take you probably longer, and it will be more difficult to adapt if later on you need some data else of your JSON... Gson has a way of operating that has been designed for developers to use it, not for trying to find workarounds!. details
  • And also take a look at other reponses of mine URL_http://stackoverflow.com/questions/16590377/custom-json-deserializer- using-gson/16591621#16591621 [here] and URL_http://stackoverflow.com/questions/16194227/is-it-possible-to-deserialize- json-property-names-with-periods-as-a-nested-objec/16196123#16196123 [here] ... and if you still have doubts, comment.. details
  • That said, in my opinion it is much easier for you to parse it creating the correspondent classes, even more taking into account the simplicity of your JSON response... With the usual approach you only have to write some super- simple classes, however, writing a custom deserializer, although is not that complex, it will take you probably longer, and it will be more difficult to adapt if later on you need some data else of your JSON... Gson has a way of operating that has been designed for developers to use it, not for trying to find workarounds!. details
  • I have a problem with parsing a JSON response using Gson.. details
  • But I have an Exception when parse this using Gson.I know this is because response array first element is not an object, but integer.. details
  • I have a problem with parsing a JSON response using Gson.. details
  • Anyway, if it's actually possible deserialize to a non-static inner class, your problem would be that... First you are parsing the JSON with your class CODETERM2 with: CODESNIPPET_JAVA1 .. details
  • In your link they say that it's not necessary, but in URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Nested-Classes- including-Inner-Classes- [Gson-documentation] it's clearly said: "Gson can also deserialize static nested classes.. details
  • You can address this problem by either making the inner class static or by providing a custom InstanceCreator for it.". details
  • Anyway, if it's actually possible deserialize to a non-static inner class, your problem would be that... First you are parsing the JSON with your class CODETERM2 with: CODESNIPPET_JAVA1 .. details
  • If the parsing with the class CODETERM6 is not working either, try to make the inner class CODETERM7 , and if that doesn't work either, please comment and I'll try to find another solution... .. details
  • I need a little help with creating classes which will be filled with GSON parser.This is the output od autocomplete Google Places API: CODESNIPPET_JAVA1 .. details
  • But I get this error: CODESNIPPET_JAVA4 .. details
  • Deserializing JSON to non-static nested classes using Gson.. details
  • I am using GSON and would like to create a custom type adapter that would simply call payload.getAsJson() and write that raw string to JsonWriter.Unfortunately this is not working for me, as the string gets escaped.. details
  • I am facing this error in parsing json data : CODESNIPPET_JAVA1 .. details
  • The above code fails to interpret value as type FlightInfo because Gson invokes list.getClass() to get its class information, but this method returns a raw class, List.class.. details
  • The problem is getting Google GSON to map each array position to a field in a normal Object.. details
  • As this is ugly, is there a better way to do this with Google GSON or even another JSON library for Java?. details
  • The problem is getting Google GSON to map each array position to a field in a normal Object.. details
  • Finally, we should write a little test: CODESNIPPET_JAVA3 .. details
  • Finally, we should write a little test: CODESNIPPET_JAVA3 .. details
  • Now I'm even confused after googling and stackoverflowing a lot.. details
  • If it can, how can I solve my problem?. details
  • If it can, how can I solve my problem?. details
  • I'm afraid the response exactly as you want it is not possible to get (as far as I understand)... .. details
  • And it would work well, but this way you can't have an arbitrary number of teleservice ojects... And by the way, I've also realised other error**: in your CODETERM26 class, the attribute name CODETERM27 doesn't match the name of the field in the JSON response, which is CODETERM28 .. details
  • And it would work well, but this way you can't have an arbitrary number of teleservice ojects... And by the way, I've also realised other error**: in your CODETERM26 class, the attribute name CODETERM27 doesn't match the name of the field in the JSON response, which is CODETERM28 .. details
  • There is an extension type adapter available URL_https://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/ java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.java [as-an-extra] that provides a bulk of the functionality you are looking for, with the caveat that the polymorphic sub-types need to be declared to the adapter ahead of time.. details
  • There is an extension type adapter available URL_https://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/ java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.java [as-an-extra] that provides a bulk of the functionality you are looking for, with the caveat that the polymorphic sub-types need to be declared to the adapter ahead of time.. details
  • By default, GSON cannot differentiate classes serialized as JSON; in other words, you will need to explicitly tell the parser what class you are expecting.. details
  • My problem is, there are a number of possible requests, all varying in small implementation details.I therefore thought to use a Request interface, defined as: CODESNIPPET_JAVA1 .. details
  • Any idea on why I am getting this error?. details
  • The error I'm getting is: CODETERM1 But I have no idea why, the json is valid according to jsonlint.. details
  • Any idea on why I am getting this error?. details
  • The error I'm getting is: CODETERM1 But I have no idea why, the json is valid according to jsonlint.. details
  • One thing to watch out for: After exporting my app and testing I ran into problems due to Proguard and GSON.. details
  • One thing to watch out for: After exporting my app and testing I ran into problems due to Proguard and GSON.. details
  • Its weird, I'll check the structure but the JSON string is generated via PHP function json_encode() ( URL_http://php.net/manual/en/function.json-encode.php) .. details
  • Yes, there is an exception: Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_ARRAY at line 1 column 57.. details
  • And this gives an error?. details
  • sorry my mistake typo :( now edited.. details
  • Making the handler static worked as well.. details
  • In Android, gson stack overflow turned out to be the declaration of a Handler.. details
  • Based on Zar's recommendation, I made the the handler static when this happened in another section of code.. details
  • If you need to see full source, FIND IT URL_http://androidsmith.com/2011/07 /using-gson-to-parse-json-on-android/ [HERE] Current Issues NullPointerException Error 401 from URL URL_https://api.company.com/api/systems/ [ URL_https://api.company.com/api/systems/ ] 04-29 15:43:25.735: E/AndroidRuntime(3678): FATAL EXCEPTION: main04-29 15:43:25.735: E/AndroidRuntime(3678): java.lang.NullPointerException04-29 15:43:25.735: E/AndroidRuntime(3678): at com.jaisonbrooks.enlightenme.PullJSON Data$SystemsRetrieverAsyncTask.onPostExecute(PullJSONData.java:96)04-29 15:43:25.735: E/AndroidRuntime(3678): at com.jaisonbrooks.enlightenme.PullJSON Data$SystemsRetrieverAsyncTask.onPostExecute(PullJSONData.java:1)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.os.AsyncTask.finish(AsyncTask.java:631)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.os.AsyncTask.access$600(AsyncTask.java:177)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.os.Handler.dispatchMessage(Handler.java:99)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.os.Looper.loop(Looper.java:137)04-29 15:43:25.735: E/AndroidRuntime(3678): at android.app.ActivityThread.main(ActivityThread.java:4898)04-29 15:43:25.735: E/AndroidRuntime(3678): at java.lang.reflect.Method.invokeNative(Native Method)04-29 15:43:25.735: E/AndroidRuntime(3678): at java.lang.reflect.Method.invoke(Method.java:511)04-29 15:43:25.735: E/AndroidRuntime(3678): at com.android.internal.os.ZygoteInit$MethodAndArgsCal ler.run(ZygoteInit.java:1006)04-29 15:43:25.735: E/AndroidRuntime(3678): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)04-29 15:43:25.735: E/AndroidRuntime(3678): at dalvik.system.NativeStart.main(Native Method) .. details
  • What's the problem?. details
  • Exclusion Strategy in gson.. details
  • So I did Complaints_Return response gson.fromJson(line, Complaints_Return.class); Now 'data' is just an object, but I have no problem decoding it.. details
  • It's in the URL_http://google - gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html class, sorry.. details
  • When I try JSONObject o JSONObject.fromJson(String), I get the error that fromJson(String) is undefined.... details
  • This seriously is a big flaw in GSON.. details
  • This seriously is a big flaw in GSON.. details
  • I would just say use a JSON parser like GSON or Jackson, the thing is by doing that you'll have to receive the entire String and parse it by hand each time (pain!).. details
  • I would just say use a JSON parser like GSON or Jackson, the thing is by doing that you'll have to receive the entire String and parse it by hand each time (pain!).. details
  • So you could declare a dumb object of CODETERM1 in Java and it will parse without you having to actually write any code intermediately to interpret the JSON string into an object.. details
  • _EDIT_: The code I've written is working for me, I mean, it parses the JSON response and stores the data in a CODETERM3 , but note that in the way you've defined your classes, you're not getting ALL the data in your JSON, I think this is deliberated, and in fact simplifies everything, because your JSON is kind of a pain in the ass ;) .. details
  • The previous code fails because Java can't know the class of CODETERM2 due to URL_http://docs.oracle.com/javase/tutorial/java/generics/erasure.html [type-erasure] .. details
  • Apologies, rollback gone wrong .>.. details
  • Android: Error while parsing JSON file using Gson.. details
  • Android: Error while parsing JSON file using Gson.. details
  • Source Code: Input JSON String in file myFile.json (Validated using JSONLint: Valid JSON) CODESNIPPET_JAVA1 .. details
  • Java source code for OrderHeader Object CODESNIPPET_JAVA3 .. details
  • Java source code for converting a JSON String to Java Object CODESNIPPET_JAVA2 .. details
  • Java source code for OrderDetail Object CODESNIPPET_JAVA4 .. details
  • It doesn't exactly solve the problem or make GSON usable in any way, because relying on the code to tell it the type of everything is never going to work.. details
  • It doesn't exactly solve the problem or make GSON usable in any way, because relying on the code to tell it the type of everything is never going to work.. details
  • I've bean looking at the CODETERM4 MongoDB driver object or using the GSON (Google) lib, but I am lacking the pattern for how to do this.. details
  • From URL_https://sites.google.com/site/gson/gson-user-guide [GSON-User-Guide] : "_While deserializing an CODETERM1 , Gson needs to create a default instance** of the class [...] Well-behaved classes that are meant for serialization and deserialization should have a no-argument constructor_" Your problem is that GSON's Instance Creator** needs a no-argument constructor in the class in which you want to deserialize the JSON response, namely CODETERM2 .. details
  • Gson won't do it "automagically" - but you can use a combination of Gson and it's low level helper JsonParser like this:DataPacket dp new Gson().fromJson(testStr, DataPacket.class);JsonParser parser new JsonParser();JsonElement e parser.parse(testStr); ChatPacket cp new Gson().fromJson(e.getAsJsonObject().getAsJsonObject("data"), ChatPacket.class);.. details
  • If I try GSONClass target gson.fromJson(response, GSONClass.class); then I get errors.. details
  • this makes me create additional class, which was the problem from the beggining.. details
  • this makes me create additional class, which was the problem from the beggining.. details
  • Do note however that you should really indicate error conditions with an appropriate HTTP status code (one of the 50x codes), as opposed to just relying on the returned data.. details
  • I provide the webmethod with a page id and it returns the page contents, in this case it returns the content for an error page.. details
  • Once you have the JsonObject, gson has many methods to manipulate it.. details
  • Isn't that the default behavior?. details
  • I want to take the only 3 first objects, I tried this code, but I get an exception "not a valid json format".. details
  • I want to take the only 3 first objects, I tried this code, but I get an exception "not a valid json format".. details
  • When I change CODETERM1 to CODETERM2 I get the following error: CODESNIPPET_JAVA5 .. details
  • This results in the following error: CODESNIPPET_JAVA4 .. details
  • Using the two different libraries (gson - first private method and jackson - second private method) is not ideal but at least we are passing all of our unit/integration tests.. details
  • gson error: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 166.. details
  • Gson fails to convert String value to List, Java.. details
  • Here I get the error: CODESNIPPET_JAVA4 .. details
  • Here is a code I fixed my problem: CODESNIPPET_JAVA8 .. details
  • I can deserialize simple objects with jsonpickle but not complex objects.. details
  • In my first gson application I avoided using additional classes to catch valuesmainly because I use json for config matters despite the lack of information (even gson page), that's what I found and used: starting from CODESNIPPET_JAVA1 .. details
  • In other words, as much as reasonable, manipulate the data as necessary, before serializing it, and similarly, manipulate the data as necessary, after deserializing it.. details
  • The Routine class had no default constructor.. details
  • The problem occurs when I restart the app and retreive the data.. details
  • All of the items in the list revert to CODETERM6 objects and cannot be cast back to CODETERM7 via CODETERM8 -> CODETERM9 (Code for loading below) CODESNIPPET_JAVA2 .. details
  • I have followed this process with the debugger and when I setRoutineList, the Routine objects are maintained without problem.. details
  • Once I try and Use this same code with a more complex JSON like this CODESNIPPET_JAVA3 .. details
  • Otherwise the GSON.toJson(); will not work and throws the exception.. details
  • Otherwise the GSON.toJson(); will not work and throws the exception.. details
  • Can you tell me what am I doing wrong?. details
  • But when I try to print the User object I receive this error: CODESNIPPET_JAVA4 .. details
  • But when I try to print the User object I receive this error: CODESNIPPET_JAVA4 .. details
  • Note that this generally significantly complicates the implementation of the user code, where solutions comparable to one-liners using the databinding API, e.g., CODETERM1 , are replaced with (easily) dozens of lines, including loops and conditionals.. details
  • If you want to use Gson, and not switch to another Java-to/from-JSON API, and if the performance of Gson's automagic databinding isn't good enough, then it is possible to stay with the Gson API, and squeeze out some moderately better performance.. details
  • If you want to use Gson, and not switch to another Java-to/from-JSON API, and if the performance of Gson's automagic databinding isn't good enough, then it is possible to stay with the Gson API, and squeeze out some moderately better performance.. details
  • @ThinkingStuff After fixing the syntax, I ended up with thie error: Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2.. details
  • I get this error when I try that.. details
  • Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2.. details
  • I get this error when I try that.. details
  • If it's not working, I would think that your implementation is incorrect.. details
  • I have not been able to get around this, is this a bug with GraphAdapterBuilder or is there a way to get around this?. details
  • I am trying to use URL_https://code.google.com/p/google-gson/source/browse/tru nk/extras/src/main/java/com/google/gson/graph/GraphAdapterBuilder.java?r=1117 [GraphAdapterBuilder] which is an extra to the GSON library to serialize an object with cyclic references.. details
  • When using ether above both fail to deserialize the interface as they are only passed the graph id like "0x4" as generated by GraphAdapterBuilder.. details
  • I am trying to use URL_https://code.google.com/p/google-gson/source/browse/tru nk/extras/src/main/java/com/google/gson/graph/GraphAdapterBuilder.java?r=1117 [GraphAdapterBuilder] which is an extra to the GSON library to serialize an object with cyclic references.. details
  • GSON GraphAdapterBuilder fails with interfaces.. details
  • To deserialize interface( which GSON doesn't do by default ) I am using URL_http://stackoverflow.com/a/9106351/1293179 [PropertyBasedInterfaceMarshal] or URL_https://code.google.com/p/soum/source/browse/trunk/wdm/src/java/org/wdm /utils/InterfaceAdapter.java?spec=svn63&r=63 [InterfaceAdapter] .. details
  • I have not been able to get around this, is this a bug with GraphAdapterBuilder or is there a way to get around this?. details
  • Unfortunately, the foo and bar fields return null values when parsing, using, e.g.. details
  • It in my opinion a little bit more "complicated" to use but it has been proven much faster than any other json libraries in benchmarks.. details
  • It in my opinion a little bit more "complicated" to use but it has been proven much faster than any other json libraries in benchmarks.. details
  • I am currently using the standard Gson.toJson and Gson.fromJson methods for serialization and deserialization of some complex objects and I am looking to reduce deserialization time if its possible.. details
  • The most complex of my object contains 43 variables if that matters.. details
  • Gson 2.2.2 Json custom JsonWriter for JsonElement to avoid escaping String?. details
  • See URL_https://code.google.com/p/google-gson/source/browse/trunk/gson/src/mai n/java/com/google/gson/stream/JsonWriter.java [ URL_https://code.google.com/p /google-gson/source/browse/trunk/gson/src/main/java/com/google/gson/stream/Jso nWriter.java] private void string() method I would like to avoid doing this for performance reasons as my String element is pre-escaped.. details
  • How can I extend the JsonElement (or the JsonWriter internal to it) such that I can avoid the JsonWriter string replacement overhead for a specific Type?. details
  • See URL_https://code.google.com/p/google-gson/source/browse/trunk/gson/src/mai n/java/com/google/gson/stream/JsonWriter.java [ URL_https://code.google.com/p /google-gson/source/browse/trunk/gson/src/main/java/com/google/gson/stream/Jso nWriter.java] private void string() method I would like to avoid doing this for performance reasons as my String element is pre-escaped.. details
  • How can I extend the JsonElement (or the JsonWriter internal to it) such that I can avoid the JsonWriter string replacement overhead for a specific Type?. details
  • URL_https://code.google.com/p/google-gson/source/browse/trunk/src/main/java/co m/google/gson/reflect/TypeToken.java?r=2 [TypeToken] is abstract, so you have to create a concrete class to instantiate it, that's why you have the CODETERM1 .. details
  • URL_https://code.google.com/p/google-gson/source/browse/trunk/src/main/java/co m/google/gson/reflect/TypeToken.java?r=2 [TypeToken] is abstract, so you have to create a concrete class to instantiate it, that's why you have the CODETERM1 .. details
  • I've looked into the source code of CODETERM2 class, it is a CODETERM3 (not interface or abstract) and without any constructor, which means it uses CODETERM4 as default.. details
  • When I use Gson to parse between object and json, the initialization of a TypeToken is so weird: CODESNIPPET_JAVA1 .. details
  • why the TypeToken construction in Gson is so weird?. details
  • Thats why server returns response as XML format.The problem is to convert the non primitive data(DATE) to JSON object.. so it would be Bad Request..I solved myself to understand the GSON adapters... details
  • The you can try reading JSONObject in catch block.. details
  • Google Gson throws exception if you use ArrayList for JsonObject... details
  • Google Gson throws exception if you use ArrayList for JsonObject... details
  • Is it just numbers ending in 0, or does that third number cross some overflow boundary?. details
  • Unfortunately its really impossible to tell what types are represented just by looking at the data alone, and there are no hints provided to allow Gson to deserialize the data for you.. details
  • But the deserialization fails, because Gson is looking for a list of persons in the JSON, but it doesn't exist.. details
  • I am struggling to find a way to serialize / deserialize this JSON output to a Java class?. details
  • My first concern, however, is that this may not be proper JSON.. details
  • When I paste this 2nd (desired) JSON snippet into URL_http://jsonlint.org [jsonlint.org] I get a parser error.. details
  • How to force Java JSON or GSON to explicitly name my arrays and objects.. details
  • URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [ URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html ] About the Exception:** You should remove this line, because you are sending a request, not responsing to one: CODESNIPPET_JAVA2 .. details
  • Now I get the following exception: CODESNIPPET_JAVA5 .. details
  • How to get rid of my problem?. details
  • How to get rid of my problem?. details
  • I've no problem to deserialize this using GSON assuming it'll never change the format.. details
  • So my question is, is there a way to make GSON pick which is the most appropriate object to deserialize or do I have to try to deserialize assuming it has come right and handle it on a catch block ?. details
  • I've no problem to deserialize this using GSON assuming it'll never change the format.. details
  • When I run this, I'm getting the following error: CODESNIPPET_JAVA4 .. details
  • Obviously, I either need to manipulate the JSON string before sending it to my GSON mapper code, or I need to configure GSON to handle the "unexpected" JSON, but I'm not sure which is easier/more appropriate.. details
  • Normally I would use GSON or Genson to map this back to a Java POJO, but this is the only area of the code where I have to do this and I want to be lazy here ;-).. details
  • It was complicated by the fact that this "element" (still would like to know what this multiple-entry/non-array json element) is embedded in a larger json object that does contain an array.. details
  • Again, this JSON is not my design - it comes from the Wordpress REST API, and (as @Perception alluded to), I think the issue I've had illustrates a design flaw in it - namely that the attachments element should be an array, rather than a single object.. details
  • Again, this JSON is not my design - it comes from the Wordpress REST API, and (as @Perception alluded to), I think the issue I've had illustrates a design flaw in it - namely that the attachments element should be an array, rather than a single object.. details
  • JSON In Jackson CODETERM2 In Gson[{"person":{"firstName":"James","lastName":"O**\u0027**tool"}}] JavaScript**; // This is where the JavaScript fails with the Jackson serialized object $.parseJSON('${requestScope.person}'); I have looked for a solution, but am unable to find one.Does anyone know if it is possible to configure Jackson to handle single quotes the same way Gson does?. details
  • Eclipse is not giving me any error...I can do "import com.google.gson.Gson;".. details
  • i've seen this user guide but unfortunately there is too much information there for a beginner.. details
  • Unfortunately I can't give you the URL for my JSON because it only works internally but it looks like this: CODESNIPPET_JAVA1 .. details
  • I get a CODETERM1 but I'm not sure if it's from failing to get the JSON or modelling it wrong.. details
  • If it's as simple as the JSON being fetched incorrectly I'll be really annoyed at myself.. details
  • I'm concerned I'm missing something to do with the inner classes.. details
  • I'm using the GSON library to convert the JSON feed to a JAVA object, i created all needed class for the conversion (mapping) The issue is on the jSON Format (I can't change it): CODESNIPPET_JAVA1 .. details
  • I tried to create an InstanceCreator for the interface of CoordinateSequence following the example URL_http://google-gson.googlecode.com/svn/tags/1.2.3/doc s/javadocs/com/google/gson/InstanceCreator.html [here] but did not succeed.. details
  • Unfortunately the class does not have a non-arg constructor, which is needed.. details
  • I posted examples of deserializing into static nested classes and inner classes at URL_http://programmerbruce.blogspot.com/2011/06/gson-v-jackson.html TOC-Nested-Classes-including-Inner-Clas [ URL_http://programmerbruce.blogspot.com/2011/06/gson-v-jackson.html TOC-Nested Classes-including-Inner-Clas] .. details
  • I am having trouble with 1)designing a class.. details
  • yes close, I'd need to put a jsondeserializer based on the Type t argument.. details
  • How can I parse this incorrect(I think) JSON using Gson library.. details
  • How to parse incorrect JSON using Gson library.. details
  • My Java source : CODESNIPPET_JAVA2 .. details
  • This post is incorrect.. details
  • Edited Just to have the complete answer here: The problem is that you are converting the json String into a CODETERM1 .. details
  • Edited Just to have the complete answer here: The problem is that you are converting the json String into a CODETERM1 .. details
  • This way you are losing the relation key-value.. details
  • This way you are losing the relation key-value.. details
  • TimeStamp Updates public void setDisplayIdInDecimal() { tag.setDisplayIdInDecimal(); } CODESNIPPET_JAVA4 .. details
  • Problem: When my JSON representation has only one item in the collection CODESNIPPET_JAVA2 .. details
  • Problem: When my JSON representation has only one item in the collection CODESNIPPET_JAVA2 .. details
  • the problem in question is the "runtime" the cause of problem is : "java lang NumberFormatException : Invalid double : "" and you sure know that with Gson you need to create a class that goes like this : CODESNIPPET_JAVA2 .. details
  • the problem in question is the "runtime" the cause of problem is : "java lang NumberFormatException : Invalid double : "" and you sure know that with Gson you need to create a class that goes like this : CODESNIPPET_JAVA2 .. details
  • How can i trick the program, know that it's not my API.. details
  • Why is that a problem?. details
  • For my default implementation I am using GSON but have run into an issue.. details
  • However, whenever I call this method I get an error: CODESNIPPET_JAVA3 .. details
  • GSON has two separate APIs (that can be combined): one is used for serialization and deserialization, and the other for streaming.. details
  • Even the simplest example must have all of them, so the code below looks rather verbose.. details
  • To use a custom ExclusionStrategy, build Gson object using the builder: CODESNIPPET_JAVA5 .. details
  • I have a structure with circular references.And for debug purposes, I want to dump it.. details
  • Related: URL_http://stackoverflow.com/questions/13460200/gson-tojson-gives- stackoverflowerror-how-to-get-proper-json-in-this-case-publ [Gson.toJson- gives-StackOverFlowError,-how-to-get-proper-json-in-this-case?-(public-static- class)] .. details
  • After about 9 hours of reading endless SO questions I finally got it through my thick skull that the error came about not because of the Date format, but because the default Gson renderer does not work well (by default) with bi-directional releationships such as @OneToMany and @ManyToOne.. details
  • Since its a static inner class .As URL_https://sites.google.com/site/gson /gson-user-guide#TOC-Java-Modifier-Exclusion [docs] pointed out and comments : As well, if a field is marked as "static" then by default it will be excluded.. details
  • As noted here in this URL_http://stackoverflow.com/questions/4470339 /deserializing-arbitrary-object-json-arrays-in-inner-classes-with-gson-or- nested [post] .. details
  • This should create a CODETERM2 object that will not exclude static fields by default.. details
  • Per URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Java-Modifier- Exclusion [this] documentation, all static fields are excluded by default.. details
  • Getting error not a JSON array when using gson.. details
  • gson trying to parse the groups array: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@1f4db697 failed to deserialize json object "[{\"sigTemplateId\": 1, \"sigTemplateGroupId\": 1, \"name\": \"Group 1\", \"ordinal\": 1}]" given the type java.util.ArrayList My object code is: CODESNIPPET_JAVA3 .. details
  • Getting error not a JSON array when using gson.. details
  • In my current project i use GSON library in android, and i've faced a problem of nested Maps deserializtion.. details
  • JSON trees are inherently expensive and heavy-weight, and not to be used for multi-megatbyte content.. details
  • Finally, if your input consists of a sequence of items, there are even better ways to slice it up (which can be done regardless of whether individual items would be CODETERM3 s or POJOs!).. details
  • JSON trees are inherently expensive and heavy-weight, and not to be used for multi-megatbyte content.. details
  • We use here the gson lib, and with the code above we can get files larger than 50Mb without problem: CODESNIPPET_JAVA1 .. details
  • To expand a little, you might try a different approach.. details
  • Second, as to using a getter and having "some getters that change the objects state," you should try to avoid that too.. details
  • GSON can do both encoding and decoding, so you can drop json.org and just use GSON instead.. details
  • Solution:**I started using GSON as @Boris suggested and the problem regarding umlauts is gone!. details
  • You could also improve on the exception handling by creating your own exception and pass it to the CODETERM8 so it can be detected via CODETERM9 in the caller.. details
  • Your other option is to write a custom deserializer that throws the exception if the JSON is the error such as: CODESNIPPET_JAVA2 .. details
  • The limitation is that if the POJO required a custom deserializer as-is, you'd have to go a little further and either pass in a CODETERM7 object in the constructor to deserialize to object itself or move the annotation checking out into a separate method and use it in your deserializer.. details
  • You could also improve on the exception handling by creating your own exception and pass it to the CODETERM8 so it can be detected via CODETERM9 in the caller.. details
  • Your other option is to write a custom deserializer that throws the exception if the JSON is the error such as: CODESNIPPET_JAVA2 .. details
  • The Server will either return the well-defined response I expect, OR it will return me an errorObject.. details
  • So my question is: Is there a way, that Gson detects a wrong type somehow, and throws me an Exception?. details
  • The Gson documentation (fromJson) clearly states that: throws JsonSyntaxException - if json is not a valid representation for an object of type classOfT so i expect to get an Exception if I try to parse the second response like this: CODESNIPPET_JAVA3 .. details
  • let Gson throw exceptions on wrong types.. details
  • because the Json doesn't represent a Dummy object, but an ErrorHolder Object.. details
  • So my question is: Is there a way, that Gson detects a wrong type somehow, and throws me an Exception?. details
  • The Gson documentation (fromJson) clearly states that: throws JsonSyntaxException - if json is not a valid representation for an object of type classOfT so i expect to get an Exception if I try to parse the second response like this: CODESNIPPET_JAVA3 .. details
  • Am I doing anything wrong here?. details
  • Your field identifiers use names that are contrary to Java coding conventions.. details
  • Thanks for your solution, after three hours of trying in vain, your method was the best I found.. details
  • wow, that's a lot of code for something that should be trivial :-s.. details
  • JSON code can be produced with FLEX-JSON Serializer or GSON libraries and this is not a problem.. details
  • URL_http://stackoverflow.com/questions/13873887/issue-with-parse-json-to-java- object-using-gson [Convert-Json-to-Java-Sample-Code] Now I am facing heap memory issue in eclispe, same as: URL_http://stackoverflow.com/questions/13119082/java-heap-space-with-gson [Java-heap-space-with-GSON] As I refer article of gson-streaming like 1.. details
  • URL_http://www.mkyong.com/java/gson-streaming-to-read-and-write-json/ [gson-streaming-to-read-and-write-json] Both have discussion on streaming like, Gson streaming processing is fast, but difficult to code, because you need to handle each and every detail of processing JSON data.. details
  • Heap memory issue with gson.. details
  • Heap memory issue with gson.. details
  • This seems to be something wrong with the gson library itself.. details
  • If it's excessive escaping is the issue wouldn't this show up in the manual serialization as well?. details
  • This because JSON and XML data models are fundamentally incompatible.. details
  • I put a breakpoint on the line where I am throwing the exception, but the line is never reached.. details
  • I put a breakpoint on the line where I am throwing the exception, but the line is never reached.. details
  • Problem is in its representation for Gson,Gson map keys of json on the variables of object (i.e Java POJO) with same name.If the name of your list is Class is CODESNIPPET_JAVA2 .. details
  • Take a look into blow reference for more details URL_http://stackoverflow.com/questions/13625206/how-to-parse-the-result-in- java/13625567#13625567 [How-to-parse-the-result-in-java?]. details
  • If not, please shove me in the right direction.. details
  • If you can't use the json fields name because it's not Java compliant: Add the following import: CODESNIPPET_JAVA3 .. details
  • If you can't use the json fields name because it's not Java compliant: Add the following import: CODESNIPPET_JAVA3 .. details
  • Sample syntax-check with URL_https://code.google.com/p/google-gson/ [Gson] (using URL_http://projectlombok.org/ [lombok] ): CODESNIPPET_JAVA1 .. details
  • Sample syntax-check with URL_https://code.google.com/p/google-gson/ [Gson] (using URL_http://projectlombok.org/ [lombok] ): CODESNIPPET_JAVA1 .. details
  • Those problems can be solved by using a TypeAdapter.. details
  • The only constraints is during deserialization: GSon has to know the types that will be deserialized.. details
  • "_ Another thing is that the null pointer exception may be caused by any other object, not specifically the HashMap.. details
  • Error: CODESNIPPET_JAVA4 .. details
  • I am using WDCalendar in Struts2.I was converting Hashmap to Json String using GSON, but all of a sudden, i am getting NULL pointer exception while conveting Hashmap to JSON String CODESNIPPET_JAVA1 .. details
  • You can use this URL_https://sites.google.com/site/gson/gson-user-guide [source-for-info] .. details
  • Java using gson to parse a complex json response.. details
  • I need to extract values from this complex json response using gson: CODESNIPPET_JAVA1 .. details
  • I've done some searching here on stackoverflow and on google, but I was unable to find any easily understandable examples that show how to traverse complex json objects such as this in java.. details
  • As you can see, the amount of nesting that may appear in the response is a bit overwhelming.. details
  • Fix that and you've fixed your problem.. details
  • Fix that and you've fixed your problem.. details
  • This looks like a bug in Gson 2.2.2. .. details
  • I set this on my exception on my return class and get the following stack trace: CODESNIPPET_JAVA1 .. details
  • If the REST web service method throws an exception, it catches it and sets the exception in the response.. details
  • I have a simple return class that either takes an exception or one of our business objects.. details
  • I have a simple return class that either takes an exception or one of our business objects.. details
  • In my case, I'm getting an InvocationTargetError that wraps one of our service exceptions.. details
  • For example, the configuration part would look similar to (assume it's JSON, but clearly it's not proper syntax): CODESNIPPET_JAVA1 .. details
  • Now I can make json out of it, but, when I try to do this by creating the actual HashMap < String, < Stack < TabInfo then again I run into trouble.The typetoken i use in that case is: CODESNIPPET_JAVA7 .. details
  • Edit 4**Here's some more information:The used Bundle class is the Bundle class used in Android to provide arguments to activities and fragments.. details
  • it seems surprising because if you added in to build path it should not popup this error.. details
  • it seems surprising because if you added in to build path it should not popup this error.. details
  • you can check this [thread]( URL_http://stackoverflow.com/questions/4961336/i-am-getting-java-lang - classnotfoundexception-com-google-gson-gson-error-even).. details
  • Keep your fields properly named in Java style as lower camel case and tell Gson to use URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs /com/google/gson/FieldNamingPolicy.html#UPPER_CAMEL_CASE [CODETERM3] instead: CODESNIPPET_JAVA1 .. details
  • Gson by default uses the field names as-is, so your fields would need to be named CODETERM1 , CODETERM2 , etc.. details
  • Ok, I figured out my original question which was a trivial naming issue, so I will repurpose this question for the actual problem.. details
  • Ok, I figured out my original question which was a trivial naming issue, so I will repurpose this question for the actual problem.. details
  • Of course, this can be modified to look at the fully qualified name of the attribute and exclude that upon a match.... details
  • Why reinvent the wheel, use URL_http://code.google.com/p/google-gson/ [GSON] - A Java library that can be used to convert Java Objects into their JSON representation and vice-versa .. details
  • Why reinvent the wheel, use URL_http://code.google.com/p/google-gson/ [GSON] - A Java library that can be used to convert Java Objects into their JSON representation and vice-versa .. details
  • json {"person":[{"name": "Alice"},{"name": "Bob"}]} or json [{"person":{"name": "Alice"}},{"person":{"name": "Bob"}}] Hope it's something trivial that I have just missed.. details
  • I've looked through the URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [api] and have missed any reference to do this.. details
  • I've looked through the URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [api] and have missed any reference to do this.. details
  • Is there more direction you can provide about the problem?. details
  • Is there more direction you can provide about the problem?. details
  • I'm new to JSON and I'm really struggling to parse this layout with GSON in Java CODESNIPPET_JAVA1 .. details
  • My main concern in using the tutorials I have read is that the multiple ID fields will get confused.. details
  • So I decided to actually try this Jackson thing out but, it seems like the parsing is a little bit more confusing here than with GSON.. details
  • For any exceptions, annotate your class field with a URL_http://google-gson.go oglecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/annotations/Serializ edName.html [CODETERM5] annotation.. details
  • Why not just ignore the timezone offset if .NET is getting it wrong?. details
  • it says from JSON string source, your string should be in JSON format already, but you are not saving it in JSON format you are saving plain text.. details
  • It is probably my lack of understanding of the Map object, but I get an error:Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method getAsJsonArray(String) is undefined for the type Map.Entry.. details
  • It is probably my lack of understanding of the Map object, but I get an error:Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method getAsJsonArray(String) is undefined for the type Map.Entry.. details
  • incorrect gson code: Expected BEGIN_OBJECT but was STRING.. details
  • The class CODETERM1 is in this particular example as being a local class inaccessible by reflection and therefore Gson cannot determine its structure.. details
  • I'm trying to parse a local json file and the output is not what it's supposed to show.I have little experience with Json (and Gson) so I'm unclear as to what the problem is.. details
  • it.item becomes a StringMap type ( URL_http://code.google.com/p/google-gson/source / browse/trunk/gson/src/main/java/com/google/gson/internal/StringMap.java?r=1131 ) I now need to access the sub-objects within this object.I can use the overrided toString function this type has which prints all objects whitin this object.. details
  • it.item becomes a StringMap type ( URL_http://code.google.com/p/google-gson/source / browse/trunk/gson/src/main/java/com/google/gson/internal/StringMap.java?r=1131 ) I now need to access the sub-objects within this object.I can use the overrided toString function this type has which prints all objects whitin this object.. details
  • Hi Max, this is my first Java project so please forgive my ignorance on missing that JSONArray was not a Java Object.. details
  • And if you are using Gson, why bother with json.org stuff?. details
  • I feel like there is a library that will make your job a lot easier with less bugs.. details
  • I see no reason why 2.1's version of GSON has a default access constructor.... details
  • I've attempted to use this but it is still getting errors, here is a pastebin link to what I have: URL_http://pastebin.com/nRiGqq9r If I use 'MyElement[] data new Gson().fromJson(jsonText, MyElement.class);' it will tell me I need to change MyElement[] to MyElement, so this also doesn't work, how will I be able to make this script work?. details
  • In new versions of GSON the TypeToken contructor is not public, hence here you get constructor not visible error.. details
  • URL_https://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google /gson/GsonBuilder.html#disableHtmlEscaping%28%29 [GsonBuilder.disableHtmlEscaping()] will help you turn that feature off if you absolutely need to.. details
  • Maybe problem with the GSON version?. details
  • Exception in thread "main" java.lang.NoSuchMethodError: com.google.gson.internal.$Gson$Types.isArray(Ljava/lang/reflect/Type;)Z at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:111) at com.google .gson.JsonSerializationContextDefault.serialize(JsonSerializationContextDefaul t.java.. details
  • If you fix the problems I pointed does it work?. details
  • If you fix the problems I pointed does it work?. details
  • Take a look at URL_http://code.google.com/p/google-gson/source/browse/trunk/ex tras/src/main/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.java [RuntimeTypeAdapterFactory] .. details
  • Take a look at URL_http://code.google.com/p/google-gson/source/browse/trunk/ex tras/src/main/java/com/google/gson/typeadapters/RuntimeTypeAdapterFactory.java [RuntimeTypeAdapterFactory] .. details
  • _removed an example here as it was not relevant anymore_ I know from experience in previous projects that it is extremely customizable, for example if the URL_http://google- gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [base-object] is not enough, one can use URL_http://google-gson.googlecode.com/svn/trunk/gson/d ocs/javadocs/com/google/gson/GsonBuilder.html [GsonBuilder] to create more complicated adapters.. details
  • If no version is set on the Gson instance then it will serialize and deserialize all fields and classes regardless of the version.. details
  • _removed an example here as it was not relevant anymore_ I know from experience in previous projects that it is extremely customizable, for example if the URL_http://google- gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html [base-object] is not enough, one can use URL_http://google-gson.googlecode.com/svn/trunk/gson/d ocs/javadocs/com/google/gson/GsonBuilder.html [GsonBuilder] to create more complicated adapters.. details
  • By default Gson will not serialize null objects refereces.. details
  • seems an error with the JSONObject library version for me.. details
  • seems an error with the JSONObject library version for me.. details
  • I keep getting an error in line 6.. details
  • Im not sure, I'd have to look at the library, but i am guessing there wouldn't be much of a problem - dont think there is much that the security manager would complain about on that.. details
  • Im not sure, I'd have to look at the library, but i am guessing there wouldn't be much of a problem - dont think there is much that the security manager would complain about on that.. details
  • ok, so, your code fails to interpret value as type HashMap because Gson invokes list.getClass() to get its class information, but this method returns a raw class, HashMap().class.. details
  • i have looked at it and i found two issues...First of all, it does not covert SubObjects to JSON** And secondly, i was not able to Parse Datetime** ..The setDateFormat property does not work in gson..it is reported bug in gson library..!. details
  • i have looked at it and i found two issues...First of all, it does not covert SubObjects to JSON** And secondly, i was not able to Parse Datetime** ..The setDateFormat property does not work in gson..it is reported bug in gson library..!. details
  • I want to parse this string as object, but it is failing.. details
  • Exception: CODESNIPPET_JAVA3 .. details
  • No problem.. added a bit more to it to explain how your json should be formatted but should work as you had it.. details
  • I have some json, with a sequence of entries which look like this (I've simplified it tofocus on relevant issue which is why it looks a little redundant): {"name":"ISPC Seychelles","company":{"name":"ISPC Seychelles","id":3427640}} sometimes however the company property is set to null: {"name":"Westin Miyako Kyoto", "company":null} I have defined my classes like this (sorry for the public access modifiers, will change these when I get this bit of code working :)) : CODESNIPPET_JAVA1 .. details
  • What exactly is the problem?. details
  • In case it does, write a deserializer for CODETERM6 and fix the problem there.. details
  • In case it does, write a deserializer for CODETERM6 and fix the problem there.. details
  • There might be some cases where you use CODETERM3 and want to get CODETERM4 rather than CODETERM5 there in, however I doubt if such a code makes sense.. details
  • Am I doing something wrong here?. details
  • I am facing a problem about the GSON json to Java.. details
  • So I list my problem here.. details
  • But when I use the code Test t g.fromJson(input, Test.class); I got the error result.. details
  • What's the problem when you try to deserialize it?. details
  • What's the problem when you try to deserialize it?. details
  • EDIT: JSON string example added (formatted): CODESNIPPET_JAVA2 .. details
  • In addition it weights as much as gson (200K).An example with Genson for your problem: CODESNIPPET_JAVA1 .. details
  • This gives exception: CODESNIPPET_JAVA3 .. details
  • Server format was changed or you tried another API version or someone made bug on server side.. details
  • If the API is giving inconsistent results and you can't find a reason on your end why it is doing so, one option is to parse the object into a GSON CODETERM1 and then convert the data to a list if it is not one already by doing CODETERM2 , etc... details
  • The alternative is to have two classes, one for each instance, but this seems sloppy if this is the only reason to have two different classes.. details
  • They are dependent on what the user's credentials are.. details
  • I haven't had any problems, until I ran into this one particular JSON return from the API.. details
  • edit What I am having trouble with is that the '524' and '525' fields are not static names.. details
  • What is the problem?. details
  • The only thing that is not correct in your code is the typing of Object, because it is not "typable".. details
  • Check out the MapTypeAdapterFactory class in the GSON source: URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/internal/bind/MapTypeAdapterFactory.java [ URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/java/c om/google/gson/internal/bind/MapTypeAdapterFactory.java] So long as the types of the keys and values can be serialized into JSON strings (and you can create your own serializers/deserializers for these custom objects) you shouldn't have any issues.. details
  • The example provided I believe is nothing more than just a starting point if you need to do something more complex.. details
  • Check out the MapTypeAdapterFactory class in the GSON source: URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/internal/bind/MapTypeAdapterFactory.java [ URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/java/c om/google/gson/internal/bind/MapTypeAdapterFactory.java] So long as the types of the keys and values can be serialized into JSON strings (and you can create your own serializers/deserializers for these custom objects) you shouldn't have any issues.. details
  • I suspect I am incorrectly handling the fact that there are many different occurances of the same type of object.. details
  • The online documentation has me confused.. details
  • You can configure a lot of things (use fields and/or methods, use constructor with arguments and without any annotation, filter properties by visibility and a lot more).. details
  • Note also that Gson comes with less features out of the box than Genson or Jackson.I also tried to implement the features I needed in Gson but I found that the Beans databinding part was not extensible (near everything in a single class with no extension points), so I would have to rewrite it.. details
  • You might also take a look at URL_http://code.google.com/p/google-gson/ [Gson] (it directly reads/writes fields, no need for getters/setters): CODESNIPPET_JAVA1 .. details
  • It's unnecessarily reinventing the wheel.. details
  • It's unnecessarily reinventing the wheel.. details
  • You might also take a look at URL_http://code.google.com/p/google-gson/ [Gson] (it directly reads/writes fields, no need for getters/setters): CODESNIPPET_JAVA1 .. details
  • EDIT (as you can't use full formatting features in comments :-( ) You can use a combination of Gson and it's low level helper JsonParser like this: CODESNIPPET_JAVA2 .. details
  • The problem is now that gson make the roomId: 1 to a double 1.0 in the StringMap and the beanmap try to parse it to an integer and throws a NumberFormatException, anyone got an idea how to fix this?. details
  • Gson force use int instead of double.. details
  • The problem is now that gson make the roomId: 1 to a double 1.0 in the StringMap and the beanmap try to parse it to an integer and throws a NumberFormatException, anyone got an idea how to fix this?. details
  • I'm doing something wrong because I get a "java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING" error.. details
  • I'm having trouble parsing the following JSON with Google's Gson: CODESNIPPET_JAVA1 .. details
  • What am I doing wrong?. details
  • How do you get GSON to omit null or empty objects and empty arrays and lists?. details
  • I hope this might help a bit, Following is an working example for returning a json object which was constructed using URL_http://code.google.com/p/google-gson/ [Gson] and tested with URL_https://addons.mozilla.org/en-us/firefox/addon/poster/ [Poster] and the url is _**domainname:port//Project_name/services/rest/getjson?name=gopi**_ Construct a complex Object as you like and finally convert to json using Gson.. details
  • PS: I dont want to give heads up for fight between Jackson vs Gson ;-) .. details
  • I hope this might help a bit, Following is an working example for returning a json object which was constructed using URL_http://code.google.com/p/google-gson/ [Gson] and tested with URL_https://addons.mozilla.org/en-us/firefox/addon/poster/ [Poster] and the url is _**domainname:port//Project_name/services/rest/getjson?name=gopi**_ Construct a complex Object as you like and finally convert to json using Gson.. details
  • I tried gson & Jackson libraries, but they seem to have problems as the formatting of this json appears different.. details
  • If json is normal, is something wrong with my java models?. details
  • Failed Converstion Attempt using gson** CODESNIPPET_JAVA5 .. details
  • or (non-escaped): CODESNIPPET_JAVA2 .. details
  • I also tried to add the JSON interceptor, but I think I misunderstood its deserialization process, as explained in the edit.. details
  • I also tried to add the JSON interceptor, but I think I misunderstood its deserialization process, as explained in the edit.. details
  • The AJAX request being sent to the server follows the following format (GET query string): CODESNIPPET_JAVA1 .. details
  • This doesn't answer the question asked but is an added step to work-around the problem to display the numbers as required by the system.. details
  • This doesn't answer the question asked but is an added step to work-around the problem to display the numbers as required by the system.. details
  • The problem is that I can not use CODETERM1 when I have only one of them and it's returned as JsonObject.. details
  • Gson can identify static format of JSON response.. details
  • It really harassing me because sometime CODETERM8 object may array when more data, may object when single data, string when no data.. details
  • The problem is that I can not use CODETERM1 when I have only one of them and it's returned as JsonObject.. details
  • The json string is a fixed array of long numbers: CODESNIPPET_JAVA1 .. details
  • Can anyone suggest what could be done to work around it or prevent it or undo it?. details
  • I need to convert json string to java object and display it as a long.. details
  • Then I've called JsonContainer data new Gson().fromJson(content, JsonContainer.class); Unfortunately data.getJsonContainer() is still null.. details
  • I am using gson library to manipulate json.. details
  • GSON throws that particular error when there's extra characters after the end of the object that aren't whitespace - and it defines whitespace very narrowly (as the JSON spec does) - only CODETERM5 , CODETERM6 , CODETERM7 , and space count as whitespace.. details
  • If you can't easily figure out what's causing the extra characters at the end and eliminate them, another option is to tell GSON to parse in lenient mode: CODESNIPPET_JAVA1 .. details
  • GSON throws that particular error when there's extra characters after the end of the object that aren't whitespace - and it defines whitespace very narrowly (as the JSON spec does) - only CODETERM5 , CODETERM6 , CODETERM7 , and space count as whitespace.. details
  • (Copied from debugger; Backslashs added) The following exception is thrown while converting result1:_com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Expected EOF at line 1 column 170_ Converting result2 works fine.. details
  • is invalid, and therefore you can't read with Gson causing the following exception: com.google.gson.JsonSyntaxException: CODETERM1 the name in front of json: CODETERM2 is invalid too.. details
  • is invalid, and therefore you can't read with Gson causing the following exception: com.google.gson.JsonSyntaxException: CODETERM1 the name in front of json: CODETERM2 is invalid too.. details
  • the first json is probably simpler, even if it relies on a hard string separator, So with the first one it seems I have to write this huge adapter: CODESNIPPET_JAVA4 .. details
  • Yes sorry, you're right... my confusion was because now the contructor is declared as protected in the 2.1 jar, thus the following line of code: Type typeOfCollectionOfFoo new TypeToken<Collection<Foo>>(){}.getType() no longer works.. details
  • I am getting the following error - I have added the GSon in my dependency - Can someone point out what I am doing wrong?. details
  • I want to grab the above data in a separate thread, I have the following code: CODESNIPPET_JAVA2 .. details
  • That solved my problem.. details
  • The developers of Gson URL_https://groups.google.com/forum/#!topic/google- gson/4G6Lv9PghUY [say] that they never felt swayed by the requests to add this feature and they were worried about murkying up the api to add support for this.. details
  • By default Gson uses fields as a basis for it's serialization.. details
  • I have a problem while parsing a json with Gson.here is my code: CODESNIPPET_JAVA1 .. details
  • But I get the next error(I also tried with new TypeToken, but the errors are the same): CODESNIPPET_JAVA2 .. details
  • ): CODESNIPPET_JAVA3 .. details
  • I have a problem while parsing a json with Gson.here is my code: CODESNIPPET_JAVA1 .. details
  • ERRORS Line 60 CODESNIPPET_JAVA2 .. details
  • I've been following a tutorial on turning an array of objects into JSON but I've come across a few errors that I can't find a solution for.. details
  • I've been following a tutorial on turning an array of objects into JSON but I've come across a few errors that I can't find a solution for.. details
  • Gson gson new Gson().toJson(data) - incompatible types.. details
  • I know from looking around that these are added by WSDL2Java (I think) in order to avoid recursion.. details
  • Extra/dupe members in SOAP response prevents serialization (Axis, Java, Gson).. details
  • The serialization to JSON fails, with Gson complaining that "there are multiple elements with the name equalsCalc()).. details
  • works, but it's ugly, how can I have a parametrized getMessage function, or anything better than returning Object and casting thx .. details
  • I'm sorry it was surely already asked, but I did not find what I need I have several message types: CODESNIPPET_JAVA1 .. details
  • I have looked at the usual Gson help sources, including URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Serializing-and-Deserializing-Collection-with-Objects-of-Arbitrary-Types [here] , but I can't seem to come up with the solution.. details
  • But deserialization is the problem I need help with.. details
  • I have looked at the usual Gson help sources, including URL_https://sites.google.com/site/gson/gson-user-guide#TOC- Serializing-and-Deserializing-Collection-with-Objects-of-Arbitrary-Types [here] , but I can't seem to come up with the solution.. details
  • Even then, there are a number of complications.. details
  • Gson uses reflection to set final fields (via .setAccessible(true)), so the problem you describe (and others related) probably come from the way Java handles finals... URL_http://docs.oracle.com/javase/specs/jls/se5.0/html/memory.html#17.5.3 [JLS-17.5.3-Subsequent-Modification-of-Final-Fields] In some cases, such as deserialization, the system will need to change the final fields of an object after construction.. details
  • Freezes of a final field occur both at the end of the constructor in which the final field is set, and immediately after each modification of a final field via reflection or other special mechanism.. details
  • Another problem is that the specification allows aggressive optimization of final fields.. details
  • Another problem is that the specification allows aggressive optimization of final fields.. details
  • The error (**Expected BEGIN_OBJECT but was STRING at line 3 column 22**) is pointing to line 3 of the input below.. details
  • I am getting a GSON error trying to unmarshal JSON into an object.. details
  • The error (**Expected BEGIN_OBJECT but was STRING at line 3 column 22**) is pointing to line 3 of the input below.. details
  • But I use Jackson instead of Gson because spring uses Jackson as default handler for json.. details
  • I am trying to get a method in springmvc to accept a partial json string of an object, and have jackson automatically de-serialize it for me.I can solve it by making a temporary object with only the attributes I want, or pass it in as a string and use Gson to desearialize it for me, but these feel hacky.. details
  • However the resulting application components will be harly coupled which will make it very difficult to replace.. details
  • That is json syntax, I dont think there is a way to disable it.. details
  • Of course, a more fix-and-go solution would be to look for invalid input in the JSON string using regex and replacing that with a default 0 value.. details
  • Take a look at URL_https://code.google.com/p/google-gson/source/browse/trunk/e xtras/src/main/java/com/google/gson/graph/GraphAdapterBuilder.java [GraphAdapterBuilder] .. details
  • Take a look at URL_https://code.google.com/p/google-gson/source/browse/trunk/e xtras/src/main/java/com/google/gson/graph/GraphAdapterBuilder.java [GraphAdapterBuilder] .. details
  • Edit:**Just in case someone has a similar problem, based on Spaeth answer I adapted the solution to a more general case using reflection.. details
  • Now, Gson obviously complains about the circular reference.. details
  • It's basically an array of Categories where each category can also have a List of sub-categories, and so on and so on.My class model looks a little like this: CODESNIPPET_JAVA2 .. details
  • Edit:**Just in case someone has a similar problem, based on Spaeth answer I adapted the solution to a more general case using reflection.. details
  • decode as a raw collection : here's URL_http://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsExample.java [an-example-very-similar-to-your-problem] .. details
  • That's a little heavy but it avoids the use of custom deserializer.. details
  • decode as a raw collection : here's URL_http://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsExample.java [an-example-very-similar-to-your-problem] .. details
  • decode as a raw collection : here's URL_http://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsExample.java [an-example-very-similar-to-your-problem] .. details
  • decode as a raw collection : here's URL_http://code.google.com/p/google-gson/source/browse/trunk/extras/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollectionsExample.java [an-example-very-similar-to-your-problem] .. details
  • That's a little heavy but it avoids the use of custom deserializer.. details
  • What's wrong with this?. details
  • The problem is that the following doesn't work and causes my page to not load: CODESNIPPET_JAVA6 .. details
  • The problem is that the following doesn't work and causes my page to not load: CODESNIPPET_JAVA6 .. details
  • It misses exception handling, and might not compile, and does slow things like create instances of CODETERM4 repeatedly.. details
  • It misses exception handling, and might not compile, and does slow things like create instances of CODETERM4 repeatedly.. details
  • If you want to parse arbitrary collections you should read URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types [Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types] and look at the example code URL_http://code.google.com/p/google-gson/source/browse/trunk/extr as/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollections Example.java [example-code] .. details
  • If you want to parse arbitrary collections you should read URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types [Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types] and look at the example code URL_http://code.google.com/p/google-gson/source/browse/trunk/extr as/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollections Example.java [example-code] .. details
  • If you want to parse arbitrary collections you should read URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types [Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types] and look at the example code URL_http://code.google.com/p/google-gson/source/browse/trunk/extr as/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollections Example.java [example-code] .. details
  • If you want to parse arbitrary collections you should read URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types [Serializing-and- Deserializing-Collection-with-Objects-of-Arbitrary-Types] and look at the example code URL_http://code.google.com/p/google-gson/source/browse/trunk/extr as/src/main/java/com/google/gson/extras/examples/rawcollections/RawCollections Example.java [example-code] .. details
  • composite in disguise ^^.. details
  • The problem is javascript hasn't "map objects" and if I use arrays to emulate maps, the results of JSON.stringify over arrays is not the same as Gson over CODETERM2 .. details
  • The above error was when I tried this way CODESNIPPET_JAVA1 .. details
  • It's possible that one of your fields contains something that's taking a long time to serialize: perhaps a very long string that requires excessive escaping?. details
  • The main difference between my scenario and yours is that I'm using my own bogus Key class.. details
  • In addition to including the _code_ that reproduces the problem you should also include representative _data_.. details
  • Converting the two date fields to 'long' saved about 50ms.. details
  • GSON Serialization very very slow.. details
  • I'm trying to serialize an array of 7000 POJO using GSON and the serialization time is extremely slow.. details
  • Any ideas why GSON is performing so badly in this case?. details
  • GSON Serialization very very slow.. details
  • I'm trying to serialize an array of 7000 POJO using GSON and the serialization time is extremely slow.. details
  • If you have no control** over the generated JSON, here's two ways to map a JSON snippet like the one in your question CODETERM2 with Gson: _Without_ your CODETERM3 class and a little bit of CODETERM4 voodoo: CODESNIPPET_JAVA1 .. details
  • Simple CODETERM2 did the job perfectly, however my applet failed to start giving exceptions that Gson library has somewhat like security problems.. details
  • Simple CODETERM2 did the job perfectly, however my applet failed to start giving exceptions that Gson library has somewhat like security problems.. details
  • There are no exceptions anymore but that simple CODETERM3 gives CODETERM4 only.. details
  • Simple CODETERM2 did the job perfectly, however my applet failed to start giving exceptions that Gson library has somewhat like security problems.. details
  • I'm having trouble reading a JSON file into a POJO.. details
  • GSON appears to be doing some kind of trick where it looks at the internal fields of my JavaBeans instead of using the publically-accessible property information.. details
  • Unfortunately this won't fly for us because our magically-created beans are full of private fields which I don't want it to store off.. details
  • It is actually cleaner now as GSON imposes fewer constraints on my POJOs (no need for annotations, or mutability).. details
  • I can deserialize them without any problems.. details
  • Once again: I don't have any problems deserializing normal json, creating custom objects, registering custom TypeAdapters, custom JavaDeserializers.. details
  • But if "field" has no data, it is an empty ARRAY (I know it's crazy, but that's the response from server and I can't change it).. details
  • How to invoke default deserialize with gson.. details
  • So, when there if no data (empty array), I obviously get the exception CODESNIPPET_JAVA3 .. details
  • I've a little problem with GSON-JSON.. details
  • Here the problem:deserializedOBJ.object return a LinkedHashMap.I want to convert back into ProtoAuth object..How I can know that is a ProtoAuth?. details
  • The problem is that the add method only takes a CODETERM2 .. details
  • The problem is that the add method only takes a CODETERM2 .. details
  • There are other similarly simple to use libraries (Gson was already mentioned); but some choices are more laborious, like original org.json library, which requires you to create intermediate "JSONObject" even if you have no need for those.. details
  • Then Gson is even more inconsistent than I guessed it was.. details
  • If you want to simply decode the JSON without serializing it into a Java class (IMHO the only way to use 'arbitrary' JSON), you'll want to use another library.. details
  • To you, this seams inflexible and laborious, but that's only because that library isn't made for what you're asking for (it doesn't parse 'arbitrary' JSON).. details
  • So, I'm still struggling a bit - any more tips hugely appreciated!. details
  • However, since the JSON has an embedded ArrayList of Objects I'm struggling a bit.... details
  • If so this seems very inflexible/laborious.. details
  • Update - Thanks to the responses I've already had on this I've had a go at putting a class together to capture the twitter JSON.. details
  • Does the exception stacktrace point the error to gson.fromJson or the subsequent lines you are trying to traverse the GSON object?. details
  • Hi Milk, comment.get(1).getData().getChildren() points to nothing, there is insufficient data at 1 to get you to children, you should put the iterator to 0 and try, nonetheless i doubt that is the issue.. details
  • Does the exception stacktrace point the error to gson.fromJson or the subsequent lines you are trying to traverse the GSON object?. details
  • It makes my mock factories easier to read.. details
  • Gson is a powerfull open source library that allows an easy mapping from POJOs to Json, and the other way around.. details
  • Gson is a powerfull open source library that allows an easy mapping from POJOs to Json, and the other way around.. details
  • What can it be that I may be doing wrong?. details
  • Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.". details
  • I am getting an error while converting the JSON to Object using Google's Gson Library when Date Atribute is there.. details
  • The reason my example is more complicated than the GSON toJson/fromJson methods is that on Android, many apps go through an obfuscation step before being released to the market.. details
  • Question**How to face that problem?. details
  • Is there any mistake I am doing in the described data exchange.I thought about many different solutions.. details
  • So when a date in summer before 1979 is converted from .NET to UTC and from Java back to Local time (for presentation), then this date loses an hour in the same time zone.. details
  • Using GSON giving error expected BEGIN_ARRAY but was STRING.. details
  • I am not sure if there is something wrong in the manner in which I have set up my classes.. details
  • I have looked at some of the similar errors on here but none of the fixes provided seem to work for me.. details
  • Using GSON giving error expected BEGIN_ARRAY but was STRING.. details
  • I get the following error: Expected BEGIN_ARRAY but was string at the above mentioned line of code.. details
  • Any idea what causes this error?. details
  • Everytime I try to do this, I get this error: CODESNIPPET_JAVA2 .. details
  • Before you worry about mixing in your domain classes etc., hard code the JSON as a string, parse that with Gson, get that working, and then worry about the more complicated case of getting JSON from a response object, hooking it up to your class, etc.. details
  • My final aim is to get an CODETERM2 of all existing three digit CODETERM3 integers in the inner object, but that will be no problem once I can iterate through the outer object.. details
  • I am struggling with this, if someone can help me i will appreciate it.. details
  • I am struggling with this, if someone can help me i will appreciate it.. details
  • when I run the code I still receive the following error(from ajax): CODESNIPPET_JAVA3 .. details
  • EDIT URL_http://stackoverflow.com/questions/10036958/the-easiest-way-to-remove-the-bidirectional-recursive-relationships [the-final-solution-of-this-problem] .. details
  • EDIT URL_http://stackoverflow.com/questions/10036958/the-easiest-way-to-remove-the-bidirectional-recursive-relationships [the-final-solution-of-this-problem] .. details
  • The only other problems that can occur in your code are scala-ralated, because I do not understand the language.. details
  • There is no exception, but I get this WRONG content of the bean: CODESNIPPET_JAVA4 .. details
  • Converting JSON to Java / Scala using GSON (or any other Library) -> Bean Structure unclear.. details
  • Unfortunately, this does not work.. details
  • There is no exception, but I get this WRONG content of the bean: CODESNIPPET_JAVA4 .. details
  • as a side note, GSON is very slow.. details
  • as a side note, GSON is very slow.. details
  • GSON was 5x slower than org.json, and 10x slower than Jackson.. details
  • Your error while using Gson is that you try to parse a complex object in CODETERM1 , which is not possible.. details
  • Your error while using Gson is that you try to parse a complex object in CODETERM1 , which is not possible.. details
  • I am getting this error message: java.lang.IllegalStateException: This is not a JSON Array.. details
  • I am having trouble parsing my JSON which i get from javascript.The format of JSON is this: CODESNIPPET_JAVA1 .. details
  • With GSON, assuming that the class you are deserializing into has fields for all the names that appear in the JSON, the fields not found in the JSON will just be left null: URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Finer-Points-with- Objects [ URL_https://sites.google.com/site/gson/gson-user-guide TOC-Finer-Points with-Objects] "While deserialization, a missing entry in JSON results in setting the corresponding field in the object to null" Things get a little more complicated if arbitrary field names are allowed in the JSON - for example, if Point allows c1, c2, ... cn.. details
  • The sections I'm concerned with are the meta data "serie" array having different parameters.. details
  • I've been given a sample of the resulting JSON and I am concerned that I will have to parse the json by hand, that I won't be able to use normal class mapping provided by tools such as GSON or Jackson.. details
  • Lastly, I am concerned that the "point" object is not similar.. details
  • But the playerUIDs variable IS NULL and of course playerUIDs[0] throws an exception!. details
  • But the playerUIDs variable IS NULL and of course playerUIDs[0] throws an exception!. details
  • GSON is also good, but unfortunately I noted you're doing Android development, HTC messed that one up for us, so if you do decide to use GSON URL_http://code.google.com/p/google-gson/issues/detail?id=255 [remember-to- jarjar] the library.. details
  • GSON is also good, but unfortunately I noted you're doing Android development, HTC messed that one up for us, so if you do decide to use GSON URL_http://code.google.com/p/google-gson/issues/detail?id=255 [remember-to- jarjar] the library.. details
  • I recommend GSON, as this has small memory footpring (just pull parsing is about 16K , jackson is way bigger) Your code is problematic because you allocate: buffer to hold all the string data coming from service all the JSON DOM objects and this is slow, and gives you memory meltdown.. details
  • I recommend GSON, as this has small memory footpring (just pull parsing is about 16K , jackson is way bigger) Your code is problematic because you allocate: buffer to hold all the string data coming from service all the JSON DOM objects and this is slow, and gives you memory meltdown.. details
  • I recommend GSON, as this has small memory footpring (just pull parsing is about 16K , jackson is way bigger) Your code is problematic because you allocate: buffer to hold all the string data coming from service all the JSON DOM objects and this is slow, and gives you memory meltdown.. details
  • In case you need java objects out of your JSON data , you may try my small databinding library building on GSON (shameles self advertising off): URL_https://github.com/ko5tik/jsonserializer [ URL_https://github.com/ko5tik/jsonserializer ] .. details
  • This is most relevant on mobile platforms where memory is limited.. details
  • JSON streaming is useful in just a few situations: When it is impossible or undesirable to load the entire object model into memory.. details
  • JSON streaming is useful in just a few situations: When it is impossible or undesirable to load the entire object model into memory.. details
  • This is most relevant on mobile platforms where memory is limited.. details
  • Now, if you really want your stuff, you can try creating your own URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/stream/JsonWriter.java [JSONWriter] and passing it to CODETERM1 .. details
  • Now, if you really want your stuff, you can try creating your own URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/stream/JsonWriter.java [JSONWriter] and passing it to CODETERM1 .. details
  • Maybe you could include POJO definitions you did try, to give an idea of what might have gone wrong?. details
  • I explain this in more detail: i want use google maps api to display map and draw path coordinated from many lat,longs.i reckon json will be better than list, but i can be wrong.. details
  • i try to adjust code from documentation - in code below i try to replace hardcoded coordinates with loop, and values from json object.. details
  • I (technically) do not get an error, but the following (which seems like a memory location): CODESNIPPET_JAVA5 .. details
  • It is throwing an error because URL_http://google- gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/com/google/gson/Gson.html [fromJson()] only accepts CODETERM1 or CODETERM2 objects, you're passing in a CODETERM3 .. details
  • Playframework, Converting JSON to Model (with Gson), saving model fails.. details
  • I'd prefer not to rewrite my booleans as ints as that will cause several issues with existing code (nonobvious, hard to read, hard to enforce, etc.). details
  • So this little snippet will produce: CODESNIPPET_JAVA2 .. details
  • I'd prefer not to rewrite my booleans as ints as that will cause several issues with existing code (nonobvious, hard to read, hard to enforce, etc.). details
  • Remember to change the namespace on the Gson library, I had problems get it running on htc telephones.. details
  • Forgive me if this is trivial or not possible but I'm having a Monday morning moment here.. details
  • Anyone can give me any pointer that where did i go wrong?. details
  • After parsing (there're no error) i try to retrieve the objects.. details
  • This might be a bit long so please bear with me... details
  • This is strictly better than mixed streaming and tree modes; with binding you don't waste memory building an intermediate representation of your values.. details
  • Like Jackson, Gson has APIs to recursively skip an unwanted value; Gson calls this URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/go ogle/gson/stream/JsonReader.html#skipValue%28%29 [skipValue()] .. details
  • This is strictly better than mixed streaming and tree modes; with binding you don't waste memory building an intermediate representation of your values.. details
  • Some idea... 1. read line by line and get rid of the JSON format: but that's nonsense.. details
  • Some idea... 1. read line by line and get rid of the JSON format: but that's nonsense.. details
  • By default it seems that gson will create the concrete instance, but does not set it's fields.. details
  • Jackson is faster, but the API is 37x more complex than the GSON API.. details
  • Also since the last GSON release and the rewrite of the stream parser the speed gap has been closed quite a bit; you can use the stream parser impl of theirs to get near-Jackson parsing speeds if that is critical.. details
  • Also since the last GSON release and the rewrite of the stream parser the speed gap has been closed quite a bit; you can use the stream parser impl of theirs to get near-Jackson parsing speeds if that is critical.. details
  • Jackson is faster, but the API is 37x more complex than the GSON API.. details
  • So now I do not get any errors and every User got a Profile - but I still need those Maps.. details
  • Where is my mistake?. details
  • //Dirty Hack Solution:An ArrayList instead of the HashMap was no problem.. details
  • I guess this is GSON's general error message for "Unable to instantiate class".. details
  • I guess this is GSON's general error message for "Unable to instantiate class".. details
  • If you look at the URL_http://code.google.com/p/google-gson/source/browse/trun k/gson/src/main/java/com/google/gson/internal/bind/DateTypeAdapter.java?r=1093 [GSON-Code] it shows that it's just blindly parsing the string using DateFormat.parse, which doesn't handle quote marks well.. details
  • If you look at the URL_http://code.google.com/p/google-gson/source/browse/trun k/gson/src/main/java/com/google/gson/internal/bind/DateTypeAdapter.java?r=1093 [GSON-Code] it shows that it's just blindly parsing the string using DateFormat.parse, which doesn't handle quote marks well.. details
  • SOLUTION The main problem was the capitalization.. details
  • GSON throws exception parsing empty Date field.. details
  • Version 2.1 of google Gson no longer has a public constructor for the TypeToken class, instead we should use one of the static methods provided by it: IE: CODESNIPPET_JAVA1 .. details
  • Give an example of JSON that fails.. details
  • You'll have to ensure your object conforms to the java bean standard, but it's really easy to use: URL_http://flexjson.sourceforge.net [ URL_http://flexjson.sourceforge.net ] Oh and its faster that GSON.. details
  • It suggested implementing the JsonDeserializer interface, and using GsonBuilder... buit again it's not clear.. details
  • the resource_uri is not really something I want persisted to the database as it is merely meta- data used for the REST interface.. details
  • I haven't tried it myself but it seems to me that URL_http://SerializedName [SerializedName] annotation should do the trick.. details
  • CODETERM6 will be a problem.. details
  • Unfortunately, one can't extends CODETERM6 since it is final.. details
  • How do I get rid of the redundant quotes?. details
  • My workaround is to use a CODETERM6 as the Type of the CODETERM7 field instead of CODETERM8 , but maybe there is a better way to handle such errors.. details
  • My workaround is to use a CODETERM6 as the Type of the CODETERM7 field instead of CODETERM8 , but maybe there is a better way to handle such errors.. details
  • to avoid the exception u need to hav JsonArray inside the file like [{"key" : "value"}].. details
  • You could also look at the GSON library, which gives you a little more control/responsibility.. details
  • GSON can absolutely deserialize arbitrary JSON.. details
  • By creating a new gson you lose other configuration options your original gson had.. details
  • Anyway, here's the code (package and imports removed) : The base class (interface in my case): CODESNIPPET_JAVA1 .. details
  • I've actually done the above using the registerTypeHierarchyAdapter method too, but that seemed to require implementing custom DogAdapter and CatAdapter serializer/deserializer classes which are a pain to maintain any time you want to add another field to Dog or to Cat.. details
  • So, based on my research and when using gson-2.0 you really don't want to use the registerTypeHierarchyAdapter method, but rather the more mundane registerTypeAdapter**.. details
  • I need to find the Class to represent that json with gson, my problem is the "id" ( represented by the "n" correlatives integers nested) .. details
  • I could try GSON, but it wouldn't solve my problem :).. details
  • Edit : Is there a chance of making a mistake while rendering the myjson?. details
  • Apologies if I'm being a bother, I've looked around the API and there isn't any reference of LinkedHashMaps, so I don't know why it's popping up here.. details
  • On the other hand, for instance creation during deserialization, since Gson uses CODETERM1 -- and not a user-defined constructor -- assignments of final fields explicitly defined in any constructor are not respected.. details
  • i deserialize a widget-hierarchy using gson, but have problems deserializing final fields.. details
  • While there is a handful of Java-to/from-JSON APIs that provide for easy (basic) binding between JSON and an arbitrary Java data structure, Jackson and Gson are by far the most sophisticated (capable) and feature-rich options.. details
  • Back in July (2011), I posted a multi-part series on my blog comparing using Gson versus Jackson, stepping through features as they were organized in the Gson User Guide, including examples of comparable implementations in Jackson (and of implementations in Gson, where the Gson User Guide was incomplete or broken).. details
  • The current release of Gson (2.0) shows to be about 16 times slower than the current release of Jackson (1.9.2) at serializing and deserializing a 500 byte JSON structure, using very comparable implementation efforts (just one or two lines of code).. details
  • The current release of Gson (2.0) shows to be about 16 times slower than the current release of Jackson (1.9.2) at serializing and deserializing a 500 byte JSON structure, using very comparable implementation efforts (just one or two lines of code).. details
  • but i am getting the value of guid as null.I know i am doing wrong but being new to JSON format is what making me more confused.. details
  • but i am getting the value of guid as null.I know i am doing wrong but being new to JSON format is what making me more confused.. details
  • From URL_http://google-gson.googlecode.com/svn/tags/gson-1.7.2/docs/javadocs/c om/google/gson/Gson.html [the-documentation-for-Gson] : Gson provides default serialization and deserialization for Enums.... details
  • The exception is understandable, because as per the solution to my previous question, GSON is expecting the Enum objects to be actually be created as CODESNIPPET_JAVA4 .. details
  • This is related to a previous question that I asked here earlier URL_http://stackoverflow.com/questions/8207274/json-parsing-using- gson/8207343#8207343 [JSON-parsing-using-Gson] I am trying to parse the same JSON, but now I have changed my classes a little bit.. details
  • The exception is understandable, because as per the solution to my previous question, GSON is expecting the Enum objects to be actually be created as CODESNIPPET_JAVA4 .. details
  • This code throws an exception, CODESNIPPET_JAVA3 .. details
  • What is wrong in what I am doing?. details
  • For some reason this is not working.. details
  • For some reason this is not working.. details
  • and then use LambdaJ to avoid writing all the loops to get the words?. details
  • Querying complex JSON is built into them, use the same libraries that they are using.. details
  • In Google's GSON if you create a POJO that lacks some properties, then the coresponding JSON is ignored.. details
  • You need a few things server-side: MySQL database PHP code that accesses the database, and writes out JSON And a few things client-side: Java JSON parser (I've used Google GSON but there are others) Java library for http requests -- sounds like you already have this under control Let me just emphasize the need for security**, especially making sure that the PHP code doesn't leave your database vulnerable to attack.. details
  • Exception: CODESNIPPET_JAVA2 .. details
  • GSON was extremely easy to use/setup and does everything I need apart from the problem in this question.. details
  • Preface: The key to use less memory of the result itsef is in the "server side" cursor.. details
  • I think Oracle cursor are server side by default.. details
  • Sorry to be late (of 2 years).. details
  • Preface: The key to use less memory of the result itsef is in the "server side" cursor.. details
  • Deserializing to such a structure with Gson is unfortunately not as simple as I think it should be, taking a few dozen lines of code.. details
  • Following are simple examples of using Gson and Jackson to deserialize/serialize JSON (similar to the invalid JSON in the original question) to/from a matching Java data structure.. details
  • I've a problem using gson (JSon Java library from Google).. details
  • I've a problem using gson (JSon Java library from Google).. details
  • This is a lot quicker than the CODETERM2 method (it doesn't do refection magic behind the scenes), uses less memory and scales better.. details
  • This is a lot quicker than the CODETERM2 method (it doesn't do refection magic behind the scenes), uses less memory and scales better.. details
  • But then the resulting types of created Objects are as follows: ( CODETERM9 , CODETERM10 ), ( CODETERM11 , CODETERM12 ), ( CODETERM13 , CODETERM14 )and I am not able to cast these objects into the corresponding "real" types, because I get class cast exceptions.. details
  • But then the resulting types of created Objects are as follows: ( CODETERM9 , CODETERM10 ), ( CODETERM11 , CODETERM12 ), ( CODETERM13 , CODETERM14 )and I am not able to cast these objects into the corresponding "real" types, because I get class cast exceptions.. details
  • Or maybe I'm wrong?. details
  • Deserializing is a bit hacky.. details
  • If you can change the source of the object you're serializing, you can add a 'classType' attribute to each instance which holds the FQN of the instance class's name.. details
  • If you can change the source of the object you're serializing, you can add a 'classType' attribute to each instance which holds the FQN of the instance class's name.. details
  • Deserializing is a bit hacky.. details
  • I'm actually using a static field to store the GsonBuilder, but I wanted to show how I arrived at the gson bit, in case it made a difference.. details
  • If you look at URL_http://stackoverflow.com/questions/4522169/customizing-json-serialization- in-play [this-post] , it shows how specific class types are registered against the GsonBuilder, so any object of that found as part of the serialisation will use your specific serialiser.. details
  • Other libraries (sorry can't recall names right now) don't seem to serialize as well.. details
  • Gson doesn't do it that way, and will grab everything.. details
  • The payoff with GSON is if you have a lot of JSON communcaion, or complex objects that require value checking to prevent illegal values (such as NaN) and other cases where java-to-JSON is less than straight forward.. details
  • I don't know Gson that well but I suspect that's not possible.. details
  • I don't know Gson that well but I suspect that's not possible.. details
  • Edit: The exception occurs when I call any method on CODETERM11 , for example CODETERM12 , so this is a runtime exception.. details
  • Silly mistake.. details
  • But I get this error: ERROR:Unable to invoke no-args constructor for interface controller.Movement.. details
  • But I get this error: ERROR:Unable to invoke no-args constructor for interface controller.Movement.. details
  • Register an InstanceCreator with Gson for this type may fix this problem.. details
  • Two Corrections (if using the latest release of Gson): 1.. details
  • Additionaly, since your data is an array of GPSObjects, I suspect gson.fromJson(response,GPSObject.class); returns an array instead of a single object - i'm no GSON expert though (using JSON simple).. details
  • However, now I'm getting this error 07-08 09:59:14.491: ERROR/AndroidRuntime(27193): java.lang.NullPointerException: println needs a message when I try to do Gson gson=new Gson(); GPSObject obj2=gson.fromJson(response,GPSObject.class); Log.i("EOH",obj2.county); I don't think the structure of my GPSObject is correct for the given JSON.. details
  • However, now I'm getting this error 07-08 09:59:14.491: ERROR/AndroidRuntime(27193): java.lang.NullPointerException: println needs a message when I try to do Gson gson=new Gson(); GPSObject obj2=gson.fromJson(response,GPSObject.class); Log.i("EOH",obj2.county); I don't think the structure of my GPSObject is correct for the given JSON.. details
  • Register an InstanceCreator with Gson for this type to fix this problem... details
  • Register an InstanceCreator with Gson for this type to fix this problem... details
  • I have not found an easy generic solution using annotations or built in functionality in the above libraries but I have probably overlooked them.. details
  • I've looked into XStream, Eclipse MOXy, FlexJSON, JSON-lib & gson My goal is to get rid of my json wrapper classes and minimize code.. details
  • You can get it early from URL_http://code.google.com/p/google-gson/source/checkout [GSON-SVN] .. details
  • You can get it early from URL_http://code.google.com/p/google-gson/source/checkout [GSON-SVN] .. details
  • InstanceCreators are useful when you absolutely have to use a particular constructor, and it's for some reason unacceptable for Gson to use the no-argument constructor (which it otherwise effectively uses, even if it's not provided by the coder or the compiler).. details
  • Gson unfortunately does not yet have a simple configuration available to handle this often-occurring problem.. details
  • Gson unfortunately does not yet have a simple configuration available to handle this often-occurring problem.. details
  • It seems like both Droid dev and Gson are sparse when it comes to documentation and examples, making it harder to compensate for these things.. details
  • If that isn't the problem, then take a look at [ URL_http://stackoverflow.com/questions/5554217/google-gson-deserialize-listclass - object-generic-type]( URL_http://stackoverflow.com/questions/5554217/google-gson - deserialize-listclass-object-generic-type), and [ URL_http://stackoverflow.com/questions/2496494/library-to-encode-decode-from - json-to-java-util-map]( URL_http://stackoverflow.com/questions/2496494/library-to - encode-decode-from-json-to-java-util-map).. details
  • Both defeat the purpose of what you are trying to do, but it is in googles court to fix this bug I believe.. details
  • The problem seems to rest in the Gson code.. details
  • This appears to be a bug surrounding the Object type.. details
  • This appears to be a bug surrounding the Object type.. details
  • Both defeat the purpose of what you are trying to do, but it is in googles court to fix this bug I believe.. details
  • The call to getTarget() seems unnecessary in the code and appears to be the source of the problem.. details
  • Now, The JsonObjectDeserializationVisitor has a flag called constructed which is set to false by default.. details
  • Both defeat the purpose of what you are trying to do, but it is in googles court to fix this bug I believe.. details
  • Both defeat the purpose of what you are trying to do, but it is in googles court to fix this bug I believe.. details
  • The call to getTarget() seems unnecessary in the code and appears to be the source of the problem.. details
  • Technical Answer** If you attach the Gson source code and then debug the program you will find the source of the problem.. details
  • "Gson fully populates all low level values by calling all set methods for all data found in the JSON.". details
  • Is it possible that the stack\vector causing this problem?. details
  • gson\json deserialization error.. details
  • That this approach works is unfortunately not in the documentation for the JsonObject.add(String, JsonElement) method (or in the documentation for the addProperty methods), rather it's revealed in the documentation for the entrySet() method!. details
  • This indicates a wrong tool to parse the JSON.. details
  • Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.. details
  • There are a few open-source projects that can convert Java objects to JSON.. details
  • However, most of them require that you place Java annotations in your classes something that you can not do if you do not have access to the source-code.. details
  • FWIW The possible solutions to this specific problem with Gson are almost identical to what's possible with Jackson's Data Binding API.. details
  • I am sorry.. details
  • Reading Json String using Gson results error "not a JSON Array".. details
  • In my project i have a complex json response.. details
  • Reading Json String using Gson results error "not a JSON Array".. details
  • Hence its call results in error, CODESNIPPET_JAVA2 .. details
  • There is a list of 3rd party libraries which have been battle tested in the app engine environment for Java; but I wasn't able to find it with a cursory google search.. details
  • This is kind of an inconvenience but its part of what allows Google to simplify app engine and offer as much hosting for free as it does.. details
  • This is kind of an inconvenience but its part of what allows Google to simplify app engine and offer as much hosting for free as it does.. details
  • There is a list of 3rd party libraries which have been battle tested in the app engine environment for Java; but I wasn't able to find it with a cursory google search.. details
  • This is kind of an inconvenience but its part of what allows Google to simplify app engine and offer as much hosting for free as it does.. details
  • This is kind of an inconvenience but its part of what allows Google to simplify app engine and offer as much hosting for free as it does.. details
  • Another possibility is to use URL_http://code.google.com/p/google-gson/ [Gson] (Note, I use lombok here to generates getters/setters, toString, etc): CODESNIPPET_JAVA1 .. details
  • Another possibility is to use URL_http://code.google.com/p/google-gson/ [Gson] (Note, I use lombok here to generates getters/setters, toString, etc): CODESNIPPET_JAVA1 .. details
  • Oh yah, I should have phrased that a little better.. details
  • Java is a completely different beast from Objective-C.. details
  • Java is a completely different beast from Objective-C.. details
  • But gson is giving a jsonparseexception and is not able to parse, parsedata is a static variable of the same type.. details
  • Perhaps you have tried a library that can solve this problem?. details
  • Perhaps you have tried a library that can solve this problem?. details
  • The Output is: {"foo":"b\"a\"r"} (as it should be) So either you are doing something wrong, or you are using an ancient version of GSON.. details
  • I'm supprised that by default GSON doesn't escape the double quote, so it doesn't generate a valid JSON.. details
  • Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.. details
  • I've been using it and haven't had any problems so far: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] .. details
  • I've been using it and haven't had any problems so far: URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google - gson/] .. details
  • Without knowing a little more info, I'd possibly look into using Gson since you say that JSONObject has been quirky for you.. details
  • I am sorry I was not clear, see my edit.. details
  • I am sorry I was not clear, see my edit.. details
  • Can't do it with URL_http://code.google.com/p/google-gson/ [GSON] (my preferred library when dealing with JSON in Java) or any other libraries because unfortunately my application needs to be Java 1.4 compliant.. details
  • Can't do it with URL_http://code.google.com/p/google-gson/ [GSON] (my preferred library when dealing with JSON in Java) or any other libraries because unfortunately my application needs to be Java 1.4 compliant.. details
  • Gives me this exception "com.google.gson.JsonObject cannot be cast to com.google.gson.JsonArray".. details
  • Sorry, please see the last line of the question.. details
  • Sorry, please see the last line of the question.. details
  • These questions might seem trivial because I have never attempted using any of these methods.. details
  • Can you foresee any problems with this technique?. details
  • And now I have two questions regarding this (which works), -Is using Object okay as a method argument, or is there a better way using Generics?. details
  • Have I missed a simple settings or type parameter?. details
  • I'm adding this to existing code so I don't have the option of changing the class structure from extending type Vector< String to containing a field of type Vector< String Here's the example source code...** CODESNIPPET_JAVA3 .. details
  • I'm adding this to existing code so I don't have the option of changing the class structure from extending type Vector< String to containing a field of type Vector< String Here's the example source code...** CODESNIPPET_JAVA3 .. details
  • side note: Get rid of the Collections.synchronizedList() calls.. details
  • I have never used Type's before, and was confused at its use.. details
  • I was afraid that I was not seeing something obvious.. details
  • The situation is complicated a little in that the JSON structure wraps the single response object in an array, and wraps each of the image objects in an array.. details
  • I can manually make a bean file that includes each currency code, but in the end, they can all be different, and my program broken.. details
  • ID 12 and 13 its shelf, volumes is a part of shelf with id 17592 and 17596 I cannot to parse it with json, i trying to use gson or json, but i can't understand how to get sime block, for e.g.. details
  • Add the CODETERM2 keyword to the constructor: CODETERM3 instead of CODETERM4 Edit: the CODETERM5 class seems to be nested in CODETERM6 as indicated by the error message.You now pass CODETERM7 to GSON, however to construct an object of a non-static nested class, you first need an object of the enclosing class.. details
  • I'm new to GSON and am really struggling to parse this data: CODESNIPPET_JAVA1 .. details
  • Here's what I have sofar, but I think it's wrong... CODESNIPPET_JAVA2 .. details
  • Here's an error I'm getting: CODESNIPPET_JAVA3 .. details
  • Unfortunately, no.. details
  • Dealing with randomly generated and inconsistent JSON field/key names using GSON.. details
  • (This one feature alone probably wouldn't be enough for me to switch to Gson.). details
  • My QueryProperty class has these fields (with getters/setters): CODESNIPPET_JAVA2 .. details
  • If I have not been clear please do let me know.. details
  • My QueryProperty class has these fields (with getters/setters): CODESNIPPET_JAVA2 .. details
  • If I have not been clear please do let me know.. details
  • Having to specify ones own custom serializer seems like awful lot of work to me.. details
  • I want to use Gson to parse it into a CODETERM2 of a custom class, but the parsing messes up somehow.. details
  • (This example also demonstrates using a CODETERM2 to avoid specifying the serialized name for every field, provided that the field-to-element name mapping is consistent.). details
  • Ok. Might want to consider filing a bug report; that would help project team to fix the issue then, as it sounds like a bug.. details
  • Ok. Might want to consider filing a bug report; that would help project team to fix the issue then, as it sounds like a bug.. details
  • This would of course slow down JSON processing.. details
  • Alternatively, you could first process the raw JSON to alter all of the element names to be the same case, all lower or all upper.. details
  • ( CODETERM13 uses the characters exactly as they are in the JSON, with the exception where the escape character '\' is found.). details
  • Unfortunately, registering a URL_http://google-gson.googlecode.com/svn/trunk/g son/docs/javadocs/com/google/gson/FieldNamingStrategy.html [CODETERM1] with the CODETERM2 wouldn't do much good, as it translates only in the opposite-than-desired direction: from the Java field name to the JSON element name.. details
  • Since CODETERM18 is also used to get the JSON element value, I'd probably just make a copy of it for getting the name, and then make small changes to force the element names to all lower or all upper case.. details
  • Strange I know, but newline characters at the end of the string made GSON fail.. details
  • If you look at the Gson source and more specifically at the JsonObject implementation you will see that the underlying data structure is a linked hash map.. details
  • The easiest way would be to force all the keys to lowercase.. details
  • If you need mixed case keys then you will have more difficulty and will need to write a more sophisticated algorithm for transforming the keys instead of simply calling jsonKey.toLowerCase().. details
  • The only way around is to enforce some naming conventions for you keys.. details
  • Should work regardless whether DESCRIPTION is defined as "Description", "description" or "DeScRipTIOn" CODESNIPPET_JAVA2 .. details
  • If the JSON structure is not a simple set of key-value pairs, where the values are all JSON primitives, but include values that are complex types like JSON objects, even if it's acceptable to transform all of the values into CODETERM18 , then it would also be necessary to implement custom deserialization processing.. details
  • Don't hesitate to head on over to URL_http://code.google.com/p/google- gson/issues/list [the-Gson-Issues-List] and submit an enhancement request for improved JSON primitive deserialization to appropriately specific Java CODETERM19 types, or to have a simple mechanism to transform any value -- including complex JSON types like objects and arrays -- in a Map into a CODETERM20 , such that custom deserialization processing as described above wouldn't be necessary.. details
  • Don't hesitate to head on over to URL_http://code.google.com/p/google- gson/issues/list [the-Gson-Issues-List] and submit an enhancement request for improved JSON primitive deserialization to appropriately specific Java CODETERM19 types, or to have a simple mechanism to transform any value -- including complex JSON types like objects and arrays -- in a Map into a CODETERM20 , such that custom deserialization processing as described above wouldn't be necessary.. details
  • For example, since it's possible to determine whether a CODETERM8 is a CODETERM9 , with a call to CODETERM10 , then one might hope Gson would just construct a CODETERM11 , but it doesn't -- Gson just creates an empty and probably-useless CODETERM12 .. details
  • (I think I understand that the question concerns how to use Gson to deserialize a JSON map structure to a Java CODETERM1 .). details
  • (This is a situation where Gson unfortunately does not currently automatically generate Java values of CODETERM11 or primitive type from JSON primitives, if the declared Java type is simply CODETERM12 .. details
  • Gson currently needs a little bit more type information about the CODETERM2 than the Java class structure in the original question provides.. details
  • Gson has traditionally been URL_http://www.cowtowncoder.com/blog/archives/2009/12/entry_345.html [amongst] the URL_http://www.cowtowncoder.com/blog/archives/2011/01/entry_437.html [slowest] .. details
  • ...to easily deserialize into a complex data structure, than the thirty lines of code that would otherwise be needed to map the pieces together one component at a time.. details
  • And of course, one could construct a CODETERM2 tree from the original Java data structure, then manipulate the JSON tree to match the desired output, and finally serialize it.. details
  • And you're right, I just did a local test and I got the same exception.. details
  • And you're right, I just did a local test and I got the same exception.. details
  • Nothing can set the private String translatedText without violating access control, so there's no way fromJSON could set it in JVMs that have not opted-into reflection trampling all over access control.. details
  • Also, as discussed, attempting to deserialize [3] to Object results in a parse exception.). details
  • Unfortunately, with Gson I've not been able to figure out a simple deserialization approach that would allow for "better" binding to more specific and mixed types in an array, since Java doesn't provide a syntax for defining a mixed type array.. details
  • CODETERM4 results in a parse exception complaining that [3] is not a primitive.. details
  • Small Update: I recently had to deserialize some sloppy JSON that included a structure not too dissimilar from that in the original question.. details
  • Also, as discussed, attempting to deserialize [3] to Object results in a parse exception.). details
  • CODETERM4 results in a parse exception complaining that [3] is not a primitive.. details
  • I don't know if you can make this (List<T> -- <T> is ok) work with Gson, since TypeToken is still essentially a static construct (which is why your code can not work).. details
  • As expected, the GSON library throws errors when parsing.Do you know how to parse a JSON structure with when a field changes structure ?. details
  • As expected, the GSON library throws errors when parsing.Do you know how to parse a JSON structure with when a field changes structure ?. details
  • The code is exactly as I receive it from the server...unfortunately I cannot change the data I receive.. details
  • I receive the following error:com.google.gson.JsonParseException: Type information is unavailable, and the target is not a primitive: [2]So it's got a problem with the 3rd item...the intArr.. details
  • I receive the following error:com.google.gson.JsonParseException: Type information is unavailable, and the target is not a primitive: [2]So it's got a problem with the 3rd item...the intArr.. details
  • The trick comes with the second parameter - the type.. details
  • your JSON is _wrong_.. details
  • As the object model gets more complicated the org.json style code veers towards unreadable whereas the gson/jackson style object mapping is still just plain java objects.. details
  • my approch so far is using GSON API, however I am stuck by actually how should I manipulate this complecated result and create java object?. details
  • We are using arrays instead of Lists with GSON, and there is no such problem: look at URL_http://app.ecwid.com/api/v1/1003/product?id=4064 [ URL_http://app.ecwid.com/api/v1/1003/product?id=4064 ] the "categories" property is actually an Javascript array with one element.. details
  • Now I know its inconsistent JSON and the easiest way to fix it would be fix the JSON itself, but unfortunately I'm getting the JSON from some one else, so I cant fix it.. details
  • I know I could iterate through the list after it is populated to remove invalid items, but I was wondering if there was any way to reject the items on the fly.. details
  • I am using the URL_http://code.google.com/p/google-gson/ [GSON] library So far my method looks like this (It's obviously wrong): CODESNIPPET_JAVA1 .. details
  • Keyword is a class with the following member variables (with getters and setters): CODESNIPPET_JAVA4 .. details
  • Keyword is a class with the following member variables (with getters and setters): CODESNIPPET_JAVA4 .. details
  • Response is a class with the following member variables (with getters and setters): CODESNIPPET_JAVA3 .. details
  • Response is a class with the following member variables (with getters and setters): CODESNIPPET_JAVA3 .. details
  • I am using the URL_http://code.google.com/p/google-gson/ [GSON] library So far my method looks like this (It's obviously wrong): CODESNIPPET_JAVA1 .. details
  • Copying from a blog post my friend asked me to proofread: In some situations, GSON makes it fantastically simple to create Java objects from JSON, though many of the examples (especially those in blog posts) are lamely trivial or unnecessarily complex, often being little more than copy-paste examples (with names changed) from the GSON documentation, which is the heart of the problem - the docs aren't very thorough in their examples, and they quickly make it seem like complex objects are complicated to map.. details
  • Copying from a blog post my friend asked me to proofread: In some situations, GSON makes it fantastically simple to create Java objects from JSON, though many of the examples (especially those in blog posts) are lamely trivial or unnecessarily complex, often being little more than copy-paste examples (with names changed) from the GSON documentation, which is the heart of the problem - the docs aren't very thorough in their examples, and they quickly make it seem like complex objects are complicated to map.. details
  • he got an error because he's not using org.json, he's using google-gson which doesn't work that way.. details
  • he got an error because he's not using org.json, he's using google-gson which doesn't work that way.. details
  • he got an error because he's not using org.json, he's using google-gson which doesn't work that way.. details
  • he got an error because he's not using org.json, he's using google-gson which doesn't work that way.. details
  • Good example (and also of why Java makes me sad :-).. details
  • Though according to [this]( URL_http://google - gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/com/google/gson/Gson.html), it's only one exception.. details
  • Your question is confusing; please elaborate, with an example.. details
  • Trouble with Gson serializing an ArrayList of POJO's.. details
  • This has lead to the most frustrating 12 hours I have spent in a long time.. details
  • I have a problem deserializing a json string with Gson.I receive an array of commands.. details
  • What is problematic is the orders list.. details
  • I suppose one has to use a "type token" parameter to Gson.parse(json,type- toke), but it is not clear to me how this can be done.. details
  • The only catch here but you will have this same problem with any other JSON (de)serializer is the nonstandard "deep" object format you want to work with.. details
  • But know I have problems deserialize the data on the android side.. details
  • But know I have problems deserialize the data on the android side.. details
  • or, to exclude the Date object CODESNIPPET_JAVA7 .. details
  • sorry for unreadable code in comments.... details
  • Your answer gave me an idea to introduce new class -> class Container { private A a; public A getA() { return a; } public void setA(A a) { this.a a; } }and deserialize it instead ->Container obj gson.fromJson(json, Container.class);but when I print obj.getA() I still get null.. details
  • but then I get an error in eclipse saying "The type new List(){} must implement the inherited abstract method..." and if I use a quick fix I get a monster of over 20 method stubs.. details
  • but then I get an error in eclipse saying "The type new List(){} must implement the inherited abstract method..." and if I use a quick fix I get a monster of over 20 method stubs.. details
  • I did it "wrong" (not shown above), just as in the example, but didn't get that exception at all.. details
  • I did it "wrong" (not shown above), just as in the example, but didn't get that exception at all.. details
  • What I tried after looking at URL_http://stackoverflow.com/questions/2496494 /library-to-encode-decode-from-json-to-java-util-map [this] (BalusC's answer): CODESNIPPET_JAVA1 .. details
  • We have micro-benchmarks available (checked into Gson subversion repository under trunk/metrics directory) that show that on simple object conversions, the low-level streaming API could be upto 10x faster.. details
  • Sorry to answer my own question, but... Make sure the white space is cleaned up around your JSON string before sending it to Gson.. details
  • OR am I going about this all wrong and should take a different approach?. details
  • I am new to GSON and haven't dealt with Java in a long time.. details
  • And I get the following error message when I try running it: CODESNIPPET_JAVA4 .. details
  • gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationConte xtDefault.java:73) at com.google.gson.JsonDeserializationContextDefault.deseri alize(JsonDeserializationContextDefault.java:51) at com.google.gson.Gson.fromJson(Gson.java:495) at com.google.gson.Gson.fromJson(Gson.java:444) at com.google.gson.Gson.fromJson(Gson.java:396) at positions.server.services.Posi tionServerServicesInternalWrapperTest.testGetPositionsForPortfolio(PositionSer verServicesInternalWrapperTest.java:134) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java:25) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(Fram eworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.ru n(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invok eExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements .InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.BlockJUnit4C lassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.Block JUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65) Caused by: java.lang.IllegalStateException: This is not a JSON Array.. details
  • JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@a17378 failed to deserialized json object {"type":"java.util.Collections$CheckedRandomAccessLis t","content":"[{\"ID\":5,\"tradable\":{\"id\":5,\"tradableName\":\"Tradable1\" ,\"moneyMultiplier\":1},\"Action\":\"buy\",\"amount\":501.0,\"price\":50.3,\"p ortfolio\":{\"ID\":2,\"portfolioName\":\"Portfolio2\"},\"account\":{\"ID\":1,\ "accountName\":\"Account1\",\"bank\":{\"ID\":1,\"BankName\":\"Bank1\"}},\"date \":\"12:17:36 02/01/1970\",\"activitySum\":0.0,\"aggregated\":false},{\"ID\":6 ,\"tradable\":{\"id\":6,\"tradableName\":\"Tradable1\",\"moneyMultiplier\":1}, \"Action\":\"sell\",\"amount\":1001.0,\"price\":50.4,\"portfolio\":{\"ID\":2,\ "portfolioName\":\"Portfolio2\"},\"account\":{\"ID\":2,\"accountName\":\"Accou nt2\",\"bank\":{\"ID\":2,\"BankName\":\"Bank2\"}},\"date\":\"12:17:36 02/01/19 70\",\"activitySum\":0.0,\"aggregated\":false},{\"ID\":7,\"tradable\":{\"id\": 7,\"tradableName\":\"Tradable2\",\"moneyMultiplier\":1},\"Action\":\"buy\",\"a mount\":502.0,\"price\":50.5,\"portfolio\":{\"ID\":2,\"portfolioName\":\"Portf olio2\"},\"account\":{\"ID\":1,\"accountName\":\"Account1\",\"bank\":{\"ID\":1 ,\"BankName\":\"Bank1\"}},\"date\":\"12:17:36 02/01/1970\",\"activitySum\":0.0 ,\"aggregated\":false},{\"ID\":8,\"tradable\":{\"id\":8,\"tradableName\":\"Tra dable2\",\"moneyMultiplier\":1},\"Action\":\"sell\",\"amount\":1002.0,\"price\ ":50.6,\"portfolio\":{\"ID\":2,\"portfolioName\":\"Portfolio2\"},\"account\":{ \"ID\":2,\"accountName\":\"Account2\",\"bank\":{\"ID\":2,\"BankName\":\"Bank2\ "}},\"date\":\"12:17:36 02/01/1970\",\"activitySum\":0.0,\"aggregated\":false}]"} given the type java.util.Collection at com.google.gson.JsonDeserializerExceptionWrapper.deser ialize(JsonDeserializerExceptionWrapper.java:63) at com.google.gson.JsonDeseri alizationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:88) at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDese rializationVisitor.java:76) at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:98) at com.google.. details
  • Unfortunately, CODETERM2 does not work, nor does using CODETERM3 in place of T. I am sure the issue stems from my lack of understanding of Java generic types.. details
  • Unfortunately, CODETERM2 does not work, nor does using CODETERM3 in place of T. I am sure the issue stems from my lack of understanding of Java generic types.. details
  • Unfortunately, clazz cannot be used in this manner and causes a compiler error.. details
  • Unfortunately, clazz cannot be used in this manner and causes a compiler error.. details
  • That solution is not very beautiful, but it does hint that you should only serialize pure data classes, not classes involved in inheritance and polymorphism.. details
  • I am struggling to get GSON to load the user details into the above Java object with the following code CODESNIPPET_JAVA2 .. details
  • I see gson has URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/go ogle/gson/JsonDeserializer.html which you can try, you can override the default deserializationw it it.. details
  • As of this writing, there are these 20: URL_http://www.JSON.org/java/index.html [org.json] URL_https://github.com/upictec/org.json.me/ [org.json.me] URL_http://jackson.codehaus.org/ [Jackson-JSON-Processor] URL_http://json-lib.sourceforge.net/ [Json-lib] URL_http://developer.berlios.de/projects/jsontools/ [JSON-Tools] URL_http://code.google.com/p/json-simple/ [json-simple] URL_http://www.stringtree.org/stringtree-json.html [Stringtree] URL_http://sojo.sourceforge.net/ [SOJO] URL_http://www.restlet.org/ [Restlet] URL_http://jettison.codehaus.org/ [Jettison] URL_http://json-taglib.sourceforge.net/ [json-taglib] URL_http://xstream.codehaus.org/ [XStream] URL_http://code.google.com/p/jsonmarshaller/ [JsonMarshaller] URL_http://flexjson.sourceforge.net/ [Flexjson] URL_http://sourceforge.net/projects/jontools/ [JON-tools] URL_http://code.google.com/p/google-gson/ [google-gson] URL_http://argo.sourceforge.net/ [Argo] URL_http://pivot.apache.org/ [Pivot] URL_http://jwm.slavitica.net/p/projects/jsonij [jsonij] URL_http://sourceforge.net/projects/fastjson/ [fastjson] ...but of course the list can change.. details
  • As of this writing, there are these 20: URL_http://www.JSON.org/java/index.html [org.json] URL_https://github.com/upictec/org.json.me/ [org.json.me] URL_http://jackson.codehaus.org/ [Jackson-JSON-Processor] URL_http://json-lib.sourceforge.net/ [Json-lib] URL_http://developer.berlios.de/projects/jsontools/ [JSON-Tools] URL_http://code.google.com/p/json-simple/ [json-simple] URL_http://www.stringtree.org/stringtree-json.html [Stringtree] URL_http://sojo.sourceforge.net/ [SOJO] URL_http://www.restlet.org/ [Restlet] URL_http://jettison.codehaus.org/ [Jettison] URL_http://json-taglib.sourceforge.net/ [json-taglib] URL_http://xstream.codehaus.org/ [XStream] URL_http://code.google.com/p/jsonmarshaller/ [JsonMarshaller] URL_http://flexjson.sourceforge.net/ [Flexjson] URL_http://sourceforge.net/projects/jontools/ [JON-tools] URL_http://code.google.com/p/google-gson/ [google-gson] URL_http://argo.sourceforge.net/ [Argo] URL_http://pivot.apache.org/ [Pivot] URL_http://jwm.slavitica.net/p/projects/jsonij [jsonij] URL_http://sourceforge.net/projects/fastjson/ [fastjson] ...but of course the list can change.. details
  • I am having a problem with GSON in my Android app.. details
  • Android and GSON throwing No-Args Constructor not found exception.. details
  • Android and GSON throwing No-Args Constructor not found exception.. details
  • What is going wrong that is causing this to fail?. details
  • What is going wrong that is causing this to fail?. details
  • Yeah, it is sometimes a pity when devs are too reluctant -- org.json package specifically is so primitive that using a proper JSON library (Gson, Jackson, json-lib) would simplify life a lot for most cases.. details
  • Yeah, it is sometimes a pity when devs are too reluctant -- org.json package specifically is so primitive that using a proper JSON library (Gson, Jackson, json-lib) would simplify life a lot for most cases.. details
  • If other answers are correct and default Map serializer won't handle nested maps, I would file a bug report for GSON team.. details
  • If other answers are correct and default Map serializer won't handle nested maps, I would file a bug report for GSON team.. details
  • Sorry, my first comment to Nishant's answer was wrong.. details
  • I'm not saying it won't work with Android -- I'm saying that people developing mobile apps sometimes shy away from third party libraries when they are easy to avoid.. details
  • Although from my quick glance it doesn't seem too heavyweight.. details
  • I'm not saying it won't work with Android -- I'm saying that people developing mobile apps sometimes shy away from third party libraries when they are easy to avoid.. details
  • Anyone can tell what is wrong with this code?. details
  • UPD**As @torbinsky and @Kevin-Dolan pointed out, the problem was because Java class structure didn't match the Json format.. details
  • Also, I'm wondering if there will be concerns depending on gson since this is tagged as Android.. details
  • The above call results in a runtime exception because Gson invokes CODETERM4 to get its class information, but this method returns a raw class, CODETERM5 .. details
  • Then try to use gson.toJson(); now the problem is over.. details
  • Oddly, the only decent JSON processor mentioned so far has been GSON.. details
  • An unsuccessful response, which will always take on the same basic structure below.. details
  • An unsuccessful response, which will always take on the same basic structure below.. details
  • To read that Json again you need to tell Gson about the type information through a TypeToken which is Gson's way of recording the runtime type information that Java erases.. details
  • Gson: How to exclude specific fields from Serialization without annotations.. details
  • Edit: I reopened the question with the following addition: I added a second field with the same type to futher clarify this problem.. details
  • I also don't want to exclude Country as a type.So the types are the same it's the actual place in the object graph that I want to pinpoint and exclude.. details
  • Basically I want to exclude CODETERM6 but not CODETERM7 .. details
  • I would appreciate any help with a solution for this problem.. details
  • I'm trying to learn Gson and I'm struggling with field exclusion.. details
  • I would appreciate any help with a solution for this problem.. details
  • The messiness inside the CODETERM7 method is for making sure you only ever get a Double or an Integer or a Long, and probably could be better, or at least simplified if you're okay with getting BigDecimals, which I believe is the default.. details
  • I'm not sure why this is not the default behavior in gson, since it is in most other semi-structured serialization libraries... .. details
  • Or you can serialize it yourself by implementing defaultWriteObject(...) and defaultReadObject(...) (I think thats what they where called...) EDIT See the part about Writing an Instance Creator here URL_http://sites.google.com/site/gson/gson-user-guide [ URL_http://sites.google.com/site/gson/gson-user-guide ] Gson cant deserialize an interface since it doesnt know which implementing class will be used, so you need to provide an instance creator for your Animal and set a default or similar.. details
  • I get why this is happening, but am having trouble figuring out the proper pattern for dealing with this.. details
  • I get why this is happening, but am having trouble figuring out the proper pattern for dealing with this.. details
  • This causes real problems for deserialization, though: CODESNIPPET_JAVA3 .. details
  • This causes real problems for deserialization, though: CODESNIPPET_JAVA3 .. details
  • URL_http://sites.google.com/site/gson/gson-user-guide#TOC-Collections-Examples [Collections-Examples] (from the URL_http://sites.google.com/site/gson/gson- user-guide [User-Guide] ): CODESNIPPET_JAVA1 .. details
  • It's also worth noting that renderJSON can take a String argument as well, which bypasses the GSON parsing.. details
  • Gson 1.6 now includes a low-level streaming API and a new parser which is actually faster than Jackson.. details
  • pojo parse gson with invalid java names.. details
  • at this point i should create a field name called default at my parse java class.Already done this parse work with the other fields , the problem is that , default isa private java name so i can't call a variable default .. details
  • I'm having a problem serializing an object using Gson.. details
  • This line causes problems:return (T) gson.fromJson(strRequest, T.class);.. details
  • This line causes problems:return (T) gson.fromJson(strRequest, T.class);.. details
  • The default configuration has the following settings: The JSON generated by toJson methods is in compact representation.. details
  • The default Date format is same as java.text.DateFormat.DEFAULT.. details
  • As you can see in URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/DefaultTypeAdapters.java?r=694#586 [this-source-snippet- from-DefaultTypeAdapters] (especially if you step through with a debugger) the variable CODETERM1 is set to the type CODETERM2 for some mysterious reason, so the runtime type of the value is never analysed.. details
  • By default, Gson excludes transient or static fields from consideration for serialization and deserialization.. details
  • The default Map serializer, as you expected, does not support nested maps.. details
  • Gson provides default serialization and deserialization for Enums, Map, java.net.URL, java.net.URI, java.util.Locale, java.util.Date, java.math.BigDecimal, and java.math.BigInteger classes.. details
  • The default field naming policy for the output Json is same as in Java.. details
  • As you can see in URL_http://code.google.com/p/google-gson/source/browse/trunk/gson/src/main/jav a/com/google/gson/DefaultTypeAdapters.java?r=694#586 [this-source-snippet- from-DefaultTypeAdapters] (especially if you step through with a debugger) the variable CODETERM1 is set to the type CODETERM2 for some mysterious reason, so the runtime type of the value is never analysed.. details
  • From the URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/co m/google/gson/Gson.html#Gson%28%29 [JavaDocs] : Constructs a Gson object with default configuration.. details
  • By default, Gson ignores the com.google.gson.annotations.Expose annotation.. details
  • By default, Gson ignores the com.google.gson.annotations.Since annotation.. details
  • OK, now I see what the problem is.. details
  • Is this a limitation of GSON or am I doing something wrong here?. details
  • What error does it get?. details
  • Does GSON default to doing that?. details
  • Download URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Example URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format-gson-api/ [ URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format-gson-api/ ] I have used the library from URL_http://www.json.org [ URL_http://www.json.org ] , but the whole thing seems to be tedious to me.. details
  • Download URL_http://code.google.com/p/google-gson/ [ URL_http://code.google.com/p/google-gson/ ] Example URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format-gson-api/ [ URL_http://www.mkyong.com/java/how-do-convert-java-object-to-from-json-format-gson-api/ ] I have used the library from URL_http://www.json.org [ URL_http://www.json.org ] , but the whole thing seems to be tedious to me.. details
  • So, sadly no Gson for Blackberry.. details
  • I have to interact with an API, and the response format (from what I've read) seems to be poorly structured.. details
  • I've found a google groups reply to a somewhat similiar problem URL_http://groups.google.com/group/google- gson/browse_thread/thread/a8a183e4fc3e1f6a?pli=1 [here] , but I'm having trouble implementing a Response class to handle the Gson.fromJson.. details
  • Whats wrong?. details
  • So you should be able to force use of something Gson recognizes, if it does not support ISO-8601 format Jackson defaults to using.. details
  • Here URL_http://json-lib.sourceforge.net/ [json-lib] , URL_http://code.google.com/p/google-gson/ [gson] or URL_http://jackson.codehaus.org/ [Jackson] would do.. details
  • Here URL_http://json-lib.sourceforge.net/ [json-lib] , URL_http://code.google.com/p/google-gson/ [gson] or URL_http://jackson.codehaus.org/ [Jackson] would do.. details
  • Other libs like Gson also support one-line methods; why many examples show much longer sections is odd.. details
  • Yes, capitalized field names are ugly, but that's how your JSON look like.. details
  • My objects now look like My code for my object is nowpublic class Watchlist { private int itemn0; private int itemn1; private int itemn2; private List array;}And MyObject looks likepublic class MyObject{ private int ListingId; private String Title;}It looks right to me so I don't understand why I'm getting an exception.. details
  • My objects now look like My code for my object is nowpublic class Watchlist { private int itemn0; private int itemn1; private int itemn2; private List array;}And MyObject looks likepublic class MyObject{ private int ListingId; private String Title;}It looks right to me so I don't understand why I'm getting an exception.. details
  • Using the List type in the deserialization I'm getting an exceptioncom.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@1cfb549 failed to deserialized json object [{"ListingId":111111111,"Title":"first title"},{"ListingId":2222222222,"Title":"second title"},{"ListingId":33333333,"Title":"third title"}] given the type com.google.gson.ParameterizedTypeImpl@5c1343I've defined by the parent object as.. details
  • The code that throws the exception is just a fromJson callWatchlist watchlist gson.fromJson(jsonResponse, Watchlist.class);.. details
  • The code that throws the exception is just a fromJson callWatchlist watchlist gson.fromJson(jsonResponse, Watchlist.class);.. details
  • If you're not keen on making instances of the Gson object everytime you can of course keep that one static at least, since it doesn't need any type parameters when created.. details
  • Well, I have to confess I'm not good at generic type in Java I've written a JSON serialize/deserialize class in C# using CODETERM1 CODESNIPPET_JAVA1 .. details
  • Well, I have to confess I'm not good at generic type in Java I've written a JSON serialize/deserialize class in C# using CODETERM1 CODESNIPPET_JAVA1 .. details
  • You need to URL_http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs /com/google/gson/GsonBuilder.html#disableHtmlEscaping%28%29 [disable-HTML- escaping] .. details
  • Can you avoid Gson converting "<" and ">" into unicode escape sequences?. details
  • There are a few open-source projects that can convert Java objects to JSON.. details
  • There are a few open-source projects that can convert Java objects to JSON.. details
  • However, most of them require that you place Java annotations in your classes something that you can not do if you do not have access to the source-code.. details
  • Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.. details
  • The problem with the array in your example is that it isn't homogenous... it has a number and two strings in it.. details
  • The problem with the array in your example is that it isn't homogenous... it has a number and two strings in it.. details
  • But when gson tries to deserialize the array it throws an exception: CODESNIPPET_JAVA3 .. details
  • Is it possible to write a json deserializer in gson that invokes the default behaviour first and then i can do some post processing on my object.. details
  • I don't know how I missed this the first time, but you can do this in Gson using its CODETERM1 : CODESNIPPET_JAVA1 .. details
  • Which, if using the jsondriver and setting the proper settings, will encode ugly types into the actual json, so that you don't loose anything.. details
  • Which, if using the jsondriver and setting the proper settings, will encode ugly types into the actual json, so that you don't loose anything.. details
  • Bewaaaaare of Gson!. details
  • But since the JSON structure at its own makes little sense, it's hard to give an appropriate suggestion.. details
  • At the end I'm getting List with only one element and with wrong values.. details
  • I have tried several solutions and the result of parsing JSON with GSON always gets wrong.. details
  • Can you indicate me plase what I'm doing wrong?. details
  • On the server-side, there are a herd of libraries to have a look at: URL_http://jackson.codehaus.org/ [Jackson] URL_http://json-lib.sourceforge.net/ [json-lib] URL_http://code.google.com/p/google-gson/ [gson] and URL_http://www.google.com/search?q=google+java+json+libraries [many-more-Java-JSON-libraries] .... details
  • It comes down to the degree of flexibility you want, the performance you need, and whether you want a simple API or if you don't mind a more complex one.. details
  • On the server-side, there are a herd of libraries to have a look at: URL_http://jackson.codehaus.org/ [Jackson] URL_http://json-lib.sourceforge.net/ [json-lib] URL_http://code.google.com/p/google-gson/ [gson] and URL_http://www.google.com/search?q=google+java+json+libraries [many-more-Java-JSON-libraries] .... details
  • It comes down to the degree of flexibility you want, the performance you need, and whether you want a simple API or if you don't mind a more complex one.. details
  • Otherwise you could just make things harder for eavesdroppers by simply using JS-based encryption, but that won't protect you too much.. details
  • Otherwise you could just make things harder for eavesdroppers by simply using JS-based encryption, but that won't protect you too much.. details
  • The "gson way" seems to be to create an equivalent wrapper java object, which has one property for the target output type - but this results in unnecessary throwaway classes.. details
  • remove the "profile":{ and closing }) using standard string parsing techniques, but this feels like the wrong approach.. details
  • Any ideas as to what I'm doing wrong?. details
  • Once the login fails you specify why that is (via status, message and details) by calling the CODETERM9 method.. details
  • You lose the auto-magic.. details
  • So instead of (public getters/setters removed for brevity, probably syntax errror in there aswell).. details
  • Gson and the argonauts - problem converting javascript array, to json string, to java pojo using gson.. details
  • Which seems rather problematic as am I creating the json string from a javascript array, using JSON.stringifier.. details
  • I've tried this:Type coordinates new TypeToken>>>>(){}.getType();But this just gives me an error-msg saying that it failed to deserialize [jsonstring].. details
  • This might be a part of my problem.. details
  • I've tried this:Type coordinates new TypeToken>>>>(){}.getType();But this just gives me an error-msg saying that it failed to deserialize [jsonstring].. details
  • If I just add another dimension, like private Collection>>> coordinates; I get this exception:Exception in thread "main" com.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@929206 failed to deserialized json object 2.963610 given the type com.google.gson.ParameterizedTypeImpl@b6a924.. details
  • The problem with doing this the way you normally would using Gson is that the JSON CODETERM1 is an object that, based on your examples, can have a variable number of fields (the arguments and their names).. details
  • The problem with doing this the way you normally would using Gson is that the JSON CODETERM1 is an object that, based on your examples, can have a variable number of fields (the arguments and their names).. details
  • With the error message, Gson is basically telling you that it is expecting an object for the fourth dimension, but it instead encountered a double.. details
  • I think I know where your problem comes from, reading the Gson API : If the object that your are serializing/deserializing is a ParameterizedType (i.e.. details
  • I'm having trouble deserializing the following json array (Sorry for the size): CODESNIPPET_JAVA1 .. details
  • But it might have confused me to the point where I'm lost, more or less... .. details
  • I get the following error message: CODESNIPPET_JAVA3 .. details
  • I get errors when I follow this.. details
  • I get errors when I follow this.. details
  • I just tried that and this error: URL_http://www.googlerrror.pastebin.com/8FFvmTCWI think my JSON is messed up.. details
  • I just tried that and this error: URL_http://www.googlerrror.pastebin.com/8FFvmTCWI think my JSON is messed up.. details
  • I just tried that and this error: URL_http://www.googlerrror.pastebin.com/8FFvmTCWI think my JSON is messed up.. details
  • I just tried that and this error: URL_http://www.googlerrror.pastebin.com/8FFvmTCWI think my JSON is messed up.. details
  • Currently, each such reference is "translated" fully so actually each object is duplicated many times, and you can't tell all those references pointed to the same object.. details
  • See also URL_http://stackoverflow.com/questions/1688099/converting-json-to- java/1688182#1688182 [this-answer] for another complex Gson example.. details
  • Strict JSON parsing with Google's Gson?. details
  • it could have been a bad jar OR it could be that you didnt import the class the first time, and eclipse did it automatically for you the second time (which it occasionally does).next time try pressing ctrl+shft+o, which automatically fills in any missing import statements.. details
  • My problem is, when I try to use it, I simply get an error.. details
  • I'm relatively new to Java, eclipse and android so this could be a completely silly question, but I'm going to ask it none the less.. details
  • My problem is, when I try to use it, I simply get an error.. details
  • Am I just completely noobing this up or is there another problem?. details
  • Does gson provide a method to drop []?. details
  • When I run the application in the simulator it show this error: "Uncaught: RuntimeException" on that annoying white screen of death and after holding the click button I can see that there is an alert dialog that says "Module 'gson-1.4' not found".. details
  • When I run the application in the simulator it show this error: "Uncaught: RuntimeException" on that annoying white screen of death and after holding the click button I can see that there is an alert dialog that says "Module 'gson-1.4' not found".. details
  • However I did added "gson-1.4.jar" in the Project's Properties -> Java Build Path -> Add External JARs... also, the Gson objects are recognized at my code, no syntax errors at my code.. details
  • With Gson (assuming that you have on object CODETERM1 on the top level of your json file): CODESNIPPET_JAVA1 .. details
  • Logically, it seems alright, however, i get an exception: CODESNIPPET_JAVA2 .. details
  • Update: I am not 100% sold on this solution yet ( more debugging needs to be done ), but I replaced the built in org.json classes with com.google.gson and the memory errors are gone.. details
  • I think this is partially due to the fact that the JsonParser from the gson libs can build objects and arrays from a Reader object, which means the creation of a String representation of the data is unnecessary.. details
  • : how is the JSONElement invalid ?. details
  • Update to be clear, your JSON structure is the problem, not your Java object structure.. details
  • Update to be clear, your JSON structure is the problem, not your Java object structure.. details
  • Only the CODETERM4 property should be replaced by CODETERM5 , since it's invalid.. details
  • These are the _POJO_ s I created for parsing (I'll leave out the CODETERM1 statements for brevity's sake): (1) The representation of the complete JSON object CODESNIPPET_JAVA2 .. details
  • Gson _does_ however create an object of the class I specified and _does not_ throw any subsequent errors.. details
  • Casting a HashMap into JSON when making the request wasn't hard at all but the other way seems to be a little tricky.. details
  • The problem is that my persisted class is actuallyan Interface and AO is proxying that object under the hood.. details
  • Nothing has worked so far and I'm using a wonky field-by-field workaround.. details
  • The problem is that my persisted class is actuallyan Interface and AO is proxying that object under the hood.. details
  • Comes up with this exception: CODESNIPPET_JAVA2 .. details
  • I had already checked out Gson source before asking this question.. details
  • yeah, using Gson is stunning simple, but I still don't know how to write this by myself, what if some day I encountered similar problems but there's no libs can use ?. details
  • Is there a specific part of this which is proving difficult?. details
  • Google Gson is open source, take your benefit of it as well.. details
  • Google Gson is open source, take your benefit of it as well.. details
  • I like Gson better for bean binding but unfortunately in my environment I can't use generics on which Gson relies heavily.. details
  • Since I am more familiar with Jackson, here are some aspects where I think Jackson has more complete support than Gson (apologies if I miss a Gson feature): Extensive annotation support; including full inheritance, and advanced "mix-in" annotations (associate annotations with a class for cases where you can not directly add them) Streaming (incremental) reading, writing, for ultra-high performance (or memory-limited) use cases; can mix with data binding (bind sub-trees) -- EDIT latest versions of Gson also include streaming reader Tree model (DOM-like access); can convert between various models (tree <-> java object <-> stream) Can use any constructors (or static factory methods), not just default constructor Field and getter/setter access (earlier gson versions only used fields, this may have changed) Out-of-box JAX-RS support Interoperability: can also use JAXB annotations, has support/work-arounds for common packages (joda, ibatis, cglib), JVM languages (groovy, clojure, scala) Ability to force static (declared) type handling for output Support for deserializing polymorphic types (Jackson 1.5) -- can serialize AND deserialize things like List correctly (with additional type information) Integrated support for binary content (base64 to/from JSON Strings) .. details
  • Since I am more familiar with Jackson, here are some aspects where I think Jackson has more complete support than Gson (apologies if I miss a Gson feature): Extensive annotation support; including full inheritance, and advanced "mix-in" annotations (associate annotations with a class for cases where you can not directly add them) Streaming (incremental) reading, writing, for ultra-high performance (or memory-limited) use cases; can mix with data binding (bind sub-trees) -- EDIT latest versions of Gson also include streaming reader Tree model (DOM-like access); can convert between various models (tree <-> java object <-> stream) Can use any constructors (or static factory methods), not just default constructor Field and getter/setter access (earlier gson versions only used fields, this may have changed) Out-of-box JAX-RS support Interoperability: can also use JAXB annotations, has support/work-arounds for common packages (joda, ibatis, cglib), JVM languages (groovy, clojure, scala) Ability to force static (declared) type handling for output Support for deserializing polymorphic types (Jackson 1.5) -- can serialize AND deserialize things like List correctly (with additional type information) Integrated support for binary content (base64 to/from JSON Strings) .. details
  • After searching through some existing libraries for JSON, I have finally ended up with these two: Jackson Google GSon I am a bit partial towards GSON, but word on the net is that GSon suffers from a certain celestial performance URL_http://www.cowtowncoder.com/blog/archives/2009/09/entry_326.html [issue] (as of Sept 2009).. details
  • After searching through some existing libraries for JSON, I have finally ended up with these two: Jackson Google GSon I am a bit partial towards GSON, but word on the net is that GSon suffers from a certain celestial performance URL_http://www.cowtowncoder.com/blog/archives/2009/09/entry_326.html [issue] (as of Sept 2009).. details
  • The problem with Gson (at least in versions up to 1.4) is that it is not able to handle circular references.. details
  • The problem with Gson (at least in versions up to 1.4) is that it is not able to handle circular references.. details
  • I don't know if GSON can do streaming/incremental binding (I thought it did not).. details
  • You may try using GSON.It's downloadable at URL_http://google- gson.googlecode.com/files/google-gson-1.4-release.zip [ URL_http://google - gson.googlecode.com/files/google-gson-1.4-release.zip] Quite simple to use actually.I used it to parse JSON results from Yelp and there is a simple example here: CODESNIPPET_JAVA1 .. details
  • This helps design secure systems that prevent injection attacks.. details
  • You can also extend Gson's default serialization and/or deserialization behavior by registering custom type adapters.. details
  • Gson can also be used to serialize arbitrarily complex objects.. details
  • Causes havoc elsewhere.. details
  • Gson fully populates all low level values by calling all set methods for all data found in the JSON.. details
  • While GSON has reasonable feature set, I thought performance was sort of weak spot (as per [ URL_http://www.cowtowncoder.com/blog/archives/2009/09/entry_326.html])As to example: I thought GSON did not really need setters, and was based on fields.. details
  • For example this fails: CODESNIPPET_JAVA1 .. details
  • URL_https://sites.google.com/site/gson/gson-user-guide#TOC-Collections- Limitations [GSON-FAQ-states-Collection-Limitation] : Collections Limitations Can serialize collection of arbitrary objects but can not deserialize from it Because there is no way for the user to indicate the type of the resulting object While deserializing, Collection must be of a specific generic type Maybe I'm using bad java practices but how would I go about building a JSON to Java messaging framework that sent/received various concrete Message objects in JSON format?. details
  • For example this fails: CODESNIPPET_JAVA1 .. details
  • Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.. details
  • There are a few open-source projects that can convert Java objects to JSON.. details
  • However, most of them require that you place Java annotations in your classes something that you can not do if you do not have access to the source-code.. details
  • Yes, this is a big problem, and is rather hard to solve.. details
  • Yes, this is a big problem, and is rather hard to solve.. details
Summaries the opinions about com.google.code.gson using topic modeling.
  • 0. jsonlib main job jackson escape property tutorial item lot populate: 135
    • And with Jackson don't help me when I need to parse large files, so for my app GSON was the best, even more slow, can read large files.. details
    • This for dynamic creation of GSON does not work as intended.. details
    • are you have another tutorial,this is my need, i want to parse the json like this.. details
    • Glad you solved.. details
    • Thanks Matt Quiros.. details
    • Thank you, but the JSON file will not contain only app1, app2, app3, it will be dynamic, so I will not be able to fix the class attributes... details
    • (main and readApp) Thank you :).. details
    • Added some new code per your recommendations, However im getting a NullPointerException - Looks like also a Error 401,.. details
    • Could you take a look to my gist please?. details
    • seems like jackson needs them and gson doesn't.. details
    • You haven't mapped the type property, is Gson happy with leaving out properties?. details
    • @Aronnn - In your fromJson call, the type you are assigning to is supposed to be MyElement[].class, not MyElement.class.. details
    • Thanks for that helpful info and tutorial on GSON, RC.. details
    • I'm sure you can probably do something similar in jackson, but I'm happy to switch to google gson as none of my client code outside the parser relies on any specific concrete json implementation.. details
    • It's true that Gson injects fields directly, but you do not to switch to other parser to solve this.. details
    • gson should be properly setting the property values.. details
    • Seems like a Map<String, YourClass> would work here.. details
    • GSON is a good library, we have been using it in our project from past 2years, and it works fine.. details
    • Thanks a lot!. details
    • Thanks, I was mixing up the info transport notation(JSON) with actual Javascript Objects.. details
    • It has the fastest json parsing capability comparing with Gson or other else.. details
    • Another library which is recommended by a lot of people is Gson, but I'm not sure if it would work in my case, since in some cases I would just want to save an array of different map tiles (like doors, walls, floor which all have different properties) or items and etc., not an object.I hesitate to use another library, since I would have to rewrite some existing code and JSONLib has some dependencies, which I don't really want in my program.. details
    • Note that the added json should _not_ be escaped, but a be part of the wrapper as a valid json entity, like this: CODESNIPPET .. details
    • Thanks a lot :) it worked.. details
    • Can someone please shed some light?. details
    • I'm pretty sure that if you don't annotate a field with the SerializedName annotation, Gson ignores it by default.. details
    • If I had to compare I would say Gson is faster and easier to use than Jackson.. details
    • When i debug the code, i can see the Item class value is successfully retrieved inside the myResponse .. details
    • I was missing the main json object at the begning the class to parse this json string using gson lib should be like this CODESNIPPET . }. details
    • Buy the way, you may want to make your code clearer, like this: CODESNIPPET .. details
    • I've been researching how to do it, but cannot seem to figure out GSON.Thanks, sorry I couldn't figure it out by myself, by no means to I mean to seem as if I was asking for spoonfeeding.If anyone could offer some help, I would be greatly appreciative.. details
    • Please debug and tell us what causes the NPE.. details
    • To make this problem clear take the 3 examples below the json is called Extra and it has the field Unit which is always a string and it has the field Value which can be a decimal(example 1), an object(example 2) or a list of objects(example 3) depending on the value of the field Unit.. details
    • Using this, you can also create other implementations based on the type of shape and add them to the switch to support them.. details
    • Additional information about good practices: You should implement your own toString() method for your classes to have better readability for debugging.. details
    • They will get the job done quicker and easier than any algorithm / method you alone can think of in a short amount of time.. details
    • I created a base customTypeAdapterFactory and then extended it for each class that needed special serialization.. details
    • The JSON is an object with a single property, and that property is a Boolean (or boolean) type value.. details
    • Please, help me figure this out.. details
    • Let's take Gson as example: you may use Gson customize serializer like following (I create class Users, otherwise other List will use MySerializer, which is not expected) CODESNIPPET .. details
    • However main advantages of Genson are : faster then Gson, more usefull features and is more flexible (you can add yourself new features in a more easy way).. details
    • Jackson does a much better job at detecting types for maps, and it is far easier to configure than GSON: databind [ .. details
    • maybe it's easier to construct an object d with the data above and serialise it to json using gson and compare.. details
    • I have read about "InstanceCreator" but it looks like i would have to create an "InstanceCreator" for each concrete class that extends "A"!. details
    • Note: if you only want to get the GUID value, you don't need to create a class YourClass , and you can use the same parsing code, but using a generic Object in the Map , i.e., Map<String, Object> .. details
    • It shows the value for "success" and "status" but arraylist showing null for name and end_time .. details
    • If your first parsing is actually working, if you then want to access the Coordinates object, just do: CODESNIPPET .. details
    • I would greatly appreciate if you can help me solve this problem.. details
    • And then add the students to the map like this: CODESNIPPET .. details
    • If you work a lot with JSON data I would really recommend that you use Gson or Jackson .. details
    • Gson does a great job for this; You can read a little tutorial about it here which should get you started; tutorial.html [ - tutorial.html] .. details
    • Could anyone please help and point me in the right direction, I'd be very greatful.. details
    • I prefer Jackson but when I evaluated it I found it was just too big for me to feel good about putting it in an android project so I went with GSON.. details
    • Jackson and Gson keep being the best library to help you.. details
    • In other words, I want all the lists, as well as each widget , to be "named".. details
    • However, there are good arguments to support properties as well.. details
    • We intend to enhance Gson in a latter version to support properties as an alternate mapping for indicating Json fields.. details
    • strings JSONParsingException and 155194 are random values from server.. details
    • Note, Gson is provided with play!framework distribution, so you are free to use it .. details
    • Try this lib, that's a good one, with the jackson we use only in the server side, because jackson is more slow in the Android than gson, at least in our test.. details
    • Properties' keys are String, Properties' values can be a String, int, Array, boolean, Map etc.. details
    • Fields 'id' and 'name' are correctly injected but the field 'properties' stays null.. details
    • Thanks a lot!!. details
    • I've checked out GSON and Jackson, but neither seem to support this.. details
    • The items should be an ArrayList of Objects (lets call them Item ) !. details
    • to hold the data, and use fromJson() to populate it, but I am unsure of exactly how it should be set up, as well as how to handle the large "items" array.. details
    • the issue is that the value coud also be CODESNIPPET .. details
    • The data-type of the value that I want to parse is simply an Boolean**.. details
    • Thanks a lot first of all.. details
    • I did figure out how to accomplish my task of taking a JSONArray and alphabetizing by "name" element.. details
    • @Aronnn - I've tried to answer that below.. details
    • This works fine when the company element is populated as in the first example in the JSON: ISPC Seychelles;Company: ISPC Seychelles However, if the element is not populated as in the second example, I get the following output: Westin Miyako Kyoto; null What I would like is the following output: Westin Miyako Kyoto; Company: null .. details
    • Please switch to Jackson or Gson.. details
    • Some pull parser like GSON oder jackson would suit your task better (jackson claims to be faster, but also heavier jars and more dependencies - I prefer GSON) You may also consider simple databinding library: ( jars available from maven central ) With it parsing of JSON becomes looks this way: ndroid/accmeter/file/SampleReader.java [ b/master/src/main/java/de/pribluda/android/accmeter/file/SampleReader.java ( just provide java.io.Reader and class to fill fields in ) .. details
    • Given the popularity of facebook, I was hoping to find some jars/lib that can do this already.. details
    • Thanks for the info.. details
    • You can see how it works, and what other chars are escaped, by looking into the code of .2.1/src/main/java/com/google/gson/stream/JsonWriter.java#125 [CODETERM11-class] .. details
    • You'll probably want to use a special wrapper object in your data model like EmailAddressList to make this easy.. details
    • This could be easy with Gson or jackson Gson example CODESNIPPET .. details
    • The basic name:values are being populated correctly but the ArrayList is not.. details
    • This of course is not a favoured one.... details
    • it is because your string starting with [ when you parsing this type of Json with Gson then you need to prefix a label to it just i like did ( {"finally": your data } ).. details
    • Actually Gson trying to map the label and its value but in your case your [ doesnt contain Label by which Gson can map.. details
    • Thanks a lot.. details
    • tutorial.html [Try-GSON--] And try to change your code design, hope it will help you.. details
    • In which case i get: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT In the end, i want to loop through positions, creating class for each "positions", which contains a List with another class Position, which has the int x, y.. details
    • I can find enough info to understand with the right terms :).. details
    • I looked through the internet, seems like most tutorials talk about how to convert fromJson().. details
    • GSON (which I've stuck with so far) does not until gson/issues/detail?id=231 [issue-231] is resolved.. details
    • for example it will be like this from facebook graph.. details
    • Alternatively, ditch the type safety of your top-level object and just use hashmaps and arrays all the way down.. details
    • [1]: - elegant-way-to-compute-a-set-difference-using-javascr/1723220#1723220.. details
    • Gson 1.7.1 and 2.0 both respect final field assignments during vanilla deserialization operations, and the initial final field assignments are not altered.. details
    • I have used other JSON libraries like JSONLib and they let you build a map in the following way: CODESNIPPET .. details
    • There's an Examples [array-example] to get you started, as well as a ton-of-others-in-the- user-guide] .. details
    • Generics will give you the benefits of compile time type safety, so yes, it probably is better if you will know what types to use this method on.. details
    • It would appear that the best option is to the @Expose ( JsonSerializer<...> ) annotation to mark the fields that you want to be serialised by Gson.. details
    • What should be added in above codes, can you please advice?. details
    • Please don't hesitate to vote for its implementation at code.google.com/p/google- gson/issues/detail?id=325.. details
    • Please don't hesitate to vote for its implementation at - gson/issues/detail?id=325.. details
    • But I need to do it with Jackson now, since Gson doesn't have support for interfaces.. details
    • GSON from google : , or Jackson the library used in spring : and I would concur with others suggesting jaxb for XML to pojo, well supported lots of tools : its the standard.. details
    • It's great; quick and efficient.. details
    • Thank you c0mrade.. details
    • (In Detail: The result of the translation request ends at FieldNamingStrategy.translateName(Field) , where the translated name is used to get the associated JSON element from a JsonObject , which has a LinkedHashMap<String, JsonElement> , called members , mapping JSON element names to their associated values.. details
    • For the sake of completeness, I'll also point out that a simple custom serializer could be employed to solve this problem.. details
    • Are you suggesting I do something like:ArrayList> data new ArrayList>(); Type arrayListType new TypeToken>>(){}.getType(); data gson.fromJson(json, arrayListType);I understand how this may work to store a String or int, but 3rd item in the array is an array, and if this array contains a JSON object { } then how would I model this?. details
    • I want to extract the values of "text" and put them into a Set of Strings (i.e.. details
    • The easiest thing might be just to do it yourself: use something like GSON or tapestry's JSONObject to construct a java representatin of your json, then just iterate through it and build whatever map structure you like.. details
    • GSON is not particularly fast, but the Jackson library can almost compete with most binary serializers (Jackson is 2-4x faster than GSON in most situations and 10-20x faster on UTF-8 because it has special code for UTF-8).. details
    • int[] ints2 gson.fromJson("[1,2,3,4,5]", int[].class); something like this is what I was looking for.. details
    • Thanks Klaus .. details
    • Android has JSON parsers build in its SDK - the package is org.json Beside this you can use libraries like Gson that wraps the json parsing in simple to use API.. details
    • You just need to say something like - "(new Gson()).fromJson(numbersText, PhoneStatus.class)".. details
    • Android comes with a lot you can use, or you can use GSON which I've had great success with: - gson/] See how easy it is: CODESNIPPET .. details
    • Here is a more recent benchmark of java serializers: - protobuf-compare/wiki/Benchmarking Notable: "Omitted from the first three charts: json/google-gson and scala.. details
    • This worked perfectly for me and it seems simpler than adding yet another library to the project.. details
    • So this serializes nicely -- but understandably drops the type information on the Animal: CODESNIPPET .. details
    • Gson is good choice!easy to use, fast, reliable.. details
    • _**UPDATE:**_ generics/4544641#4544641 [As-Abhinav-points-out] , the GSON library will help you accomplish your final goal of deserializing objects in a way that uses generics appropriately.. details
    • Luckily the [remedy]( - converting-and-into-unicode-escape-sequences/4147245#4147245) is easy once you know where to look.. details
    • Can Gson be configured to parse a timestamp-formatted date such as 1291158000000 into a java.util.Date object?. details
    • It seems like GSON supports this, although I don't know if you want to switch from the json library you are using From the user guide: CODESNIPPET .. details
    • [ { "data": [ [ 1, 1, "Text" ], [ 2, 2, "Text" ], [ 3, 0, "Text" ], [ 5, 2, "Text" ] ], "label": "First Series" } ] I have read on these forums Gson is my best bet going forward.. details
    • gson does the job very well, thanks @rsilva !. details
    • gson does the job very well, thanks @rsilva !. details
    • Is there a best practice way of doing this?. details
    • status , message and detail being Strings here as well.. details
    • And to get the map item at x=3 and y=3: CODESNIPPET .. details
    • The UI was working fine but when I added the gson part it started failing, it wont run.. details
    • Thanks, I use Gson a lot and jackson, jsonlib.. details
    • I recommend to get yourself through the Sun-tutorial-on-the-subject first.. details
    • Here's another benchmark that can highlight how fast Jackson is if compared to GSon.. details
    • Using a library such as the one described at: Looking at the description of gson , it certainly looks like it would do the job as well.. details
    • JSONLib is awesome as a core JSON library when you just want to process all elements of a JSON.. details
  • 1. jackson implement circular external future gener webapp complexity manner marry: 147
    • errr... somebody upvote this back up.. details
    • You need to use a JSON library like GSON , Jackson .. details
    • from this it looks like it's generating 7 JSON object instead of one single - is there a way to combine the JSON objects together and store in a variable?. details
    • Well, my use case isn't always this simple, just wanted a simple example on here instead of having a 300 line example of nested JSONObjects @Edward Falk.. details
    • FWIW, almost all Java JSON libraries support this conversion mode, including GSON, Jackson and Genson.. details
    • Because if you don't have many and very different possibilities, there's something you can do easy.... details
    • Is it safety when you didn't close inputStream?. details
    • Jackson is a popular alternative to GSON.. details
    • With latest Gson (2.2.4) it works fine.. details
    • @nurisezgin: I already created Values class and can you answer my question please.. details
    • @Programmer Bruce +1 for saying "rather have one simple line of code".. details
    • When I print this string and pass to GSON it goes fine but as soon as I pass x it gives me different errors.. details
    • I saw type tokens, and it seems like what I want, but I don't see how you can do it with this case because the list is inside another object, so if I unmarshall that outer object with the type token for the list it won't work.. details
    • If it's empty you should check your query, if not would be nice if you could paste the result of resultAdHoc.toString() editing your question.. details
    • Gson can deserialize fine without a no-args constructor, as OP has stated in his question.. details
    • I'll be glad to look at some code (type of circular dependency more specifically).. details
    • I personally prefer GSON its googles support for JSON check out this thread .. details
    • I guess this tag may be valid for some libraries but not for others, or is it something pretty standard?. details
    • But from running this locally, I don't think it supports statements of being super fast.. details
    • Not sure, but it seems like you have a list of users, not a single user.. details
    • And try to pass result like this CODESNIPPET .. details
    • It's less verbose, easier to read, and most notably, easy to parse with Gson: CODESNIPPET .. details
    • These don't really make good use of the full deserialization that can be done, but you could use them to parse out an element of a json array, and pass that item to a typical JSON object mapper, (like Jackson, GSON, etc).. details
    • If you're not tied with Jackson, you can use the handy google-gson library as an alternative.. details
    • Because the key is the String data1 and the value is another JSON object which is serialized as I showed above.. details
    • but i want the result like this CODESNIPPET .. details
    • :)GSON is better than most at I/O, but Boon does best all around (and best at I/O), and it has an index overlay mode that is even faster (look at the second set.. the index overlay puts Boon way over the top).. details
    • It compares Boon, Jackson, Smart JSON and GSON.. details
    • "visualization" is a string with a correct JSON format.. details
    • I receive JSON like this CODESNIPPET .. details
    • As to Gson vs Jackson: just note that code you gave is different from original one -- you are using POJOs (which makes sense!. details
    • (you can skip if you want)** You asked also why you serialize the name of the enum value instead of its "properties".. details
    • Here's what my inherited class (ObixOp) looks like: CODESNIPPET . }. details
    • In second case, blob will be deserialized as a LinkedTreeMap, so you can access its elements using ((Map) test2.blob).get("to") for example; Let me know if it's enough or if you are interested also in the type adapter solution.. details
    • Before serializing this object with GSON, getSomeCalculationValue works fine.. details
    • since learnt from implementing backbone and gson that it is not that smart to do so.. details
    • We actually did some performance tests and found jackson considerably faster than gson.. details
    • I've never played with it, but would be interested to see the library size and performance comparison to gson, jackson, and native android json handling code.. details
    • How to get variable's value from Gson.. details
    • FWIW, this may be relevant gson/vcKvgUDxuUk [Default-Value-when-deserialized?]. details
    • : If your class has a default constructor (even an empty one), _your first pattern (initializing the instances variables where they are defined instead of in the constructor) should work fine._ If your class does not have a default constructor, I believe (I could be wrong) that Gson manually tries to allocate the object, which would skip any initialization at all.. details
    • @Sam: Well it was working fine before with the same piece of code, any how i ll try to pass string object instead of null.... details
    • IT does exactly what you want, and there is lots of documentation and examples out there, and the library is even quite well documented: - gson/] /simple-gson-example/ Hope this helps for your future projects.. details
    • See #!topic/google-gson/hFpBXbudMRQ.. details
    • I want to need the first four values of eah array and skip rest of the values like: CODESNIPPET .. details
    • I would personally recommend using something like GSON and Jackson.. details
    • I am trying to use gson but doesnt seem to work well if the values in hashmaps are hashmaps instead of simple strings.. details
    • Ask the creator to use a validator If you have received the String from an external source, it's perfectly legitimate to ask for a _valid_ json you can work with.. details
    • It's lightweight and faster than Gson.. details
    • Adapter can be like : CODESNIPPET .. details
    • Now, i have create a non-args constructor in the class "A", but no luck.. details
    • Gson uses reflection and doesn't care whether or not a class implements Serializable .. details
    • Edit: Note that this only works because your anonymous class can be cast to Map<String, String> .. details
    • You should parse the JSON string passed as a parameter, and you can do it with Gson as well, like this: CODESNIPPET .. details
    • Any help would be greatly appreciated.. details
    • However, in the JSON response it finds three elements "Teleservice_1" , "Teleservice_2" and "Teleservice_3" , but none of them has the same name listTeleServices , so Gson skip all these values and assigns null to the attribute listTeleServices .... details
    • And in the JSON response it finds exactly that, some pairs of strings "Teleservice_1" , "Teleservice_2" and "Teleservice_3" , and some objects {} , so it can keep parsing happily... _P.S:_ To go further, note that you could have in your class ListTeleServices these attributes: CODESNIPPET .. details
    • The resulting value will be of the type JSONArray .. details
    • I want to log every values from JSON file but all i get com.example.parsingapi.JsonParse$SettingElement@40d116c98 What am i doing not right here?. details
    • Both are very easy to use, I prefer Gson because it works without annotations in the POJOs.. details
    • I have a JSON object that I'd like to get the key names from and store them in an ArrayList.. details
    • In the latest rounds of performance tests posted at /jvm-serializers/wiki , the results suggest that the combined performance of Gson serialization and deserialization could possibly be improved by about 25%, by using the-streaming- API-of-Gson] instead of databinding.. details
    • I have successfully started using GSON to serialize and de-serialize a hierarchy of objects in my Android application.. details
    • I just know this kind of format: {} , what's the braces in above for?. details
    • There are "well" known :) issues of Gson to serialize Map when the key is derived from object and its not a "native" data type.Please use this CODESNIPPET .. details
    • that's pretty much the relevant code: CODESNIPPET .. details
    • If you actually go forward with this you can probably make it slightly more efficient by looking up and caching the methods in TypeAdapterFactory.create().. details
    • Any help would be greatly appreciated.. details
    • They cannot be based on a path or nesting level, but annotations and names are fine.. details
    • This would enable me to do things like: CODESNIPPET .. details
    • they vary in the sense that, keys and values may be added or altered.. details
    • This will work on Jackson as well as many other Java JSON libs (Gson, Genson at least), and will also be faster method to use.. details
    • Edit to add:** A typical use for Gson would be something like: CODESNIPPET .. details
    • Further more GSON really seems to be faster than Jackson Json.. details
    • Edit to Add:** Someone upvoted this recently and re-reading it I thought "Huh, you know, you could do this yourself and it might be handy".. details
    • Nice work Asim.. details
    • The inner parts will be able to translate back to a class appropriately but between the rules I'd like to have an option for "AND" as well as "OR" with nesting.. details
    • The fastest library I know of is Jackson, but I personally prefer Google-GSON because it's fast enough and yet remains very easy to use.. details
    • Seems like it's empty now.. details
    • There are 3rd party library available like Jackson, gson, felxjson.. details
    • They may be similar but I am not having much luck in piecing the pieces together.]. details
    • Thank you Steve.. details
    • Use a library like Gson or Jackson and map the JSON to a Java Object.. details
    • I have not tried a lot of combinations, but it seems like google-gson keeps the order of attributes in to_s .. details
    • It all went perfectly fine until I've added a byte[] field to both classes.here are the classes definitions:C#: CODESNIPPET .. details
    • If you don't want to use Genson, I really recommend you Jackson over Gson.. details
    • Actually Genson is faster and has more features than Gson and has performances close to jackson (but its a lot more lightweight) see .. details
    • Please visit: files.html [Read-JSON-files-using-Java-gson-library] .. details
    • it seems json can't handle Object keys as array, so I would need to tranfer them like that: CODESNIPPET .. details
    • If you can't get Gson to do what you want, below is how you can accomplish this using MOXy's native JSON binding.. details
    • doesnt work, because after that there are only references in the jsonObject but no values.. details
    • It gives following output: {"testVar": 1} I expected 3 in the json string, but what I got was the value held by testVar variable of parentClass.. details
    • Adobe Flex for exmaple handles XML very well, even better than JSON.. details
    • and obtain a result like this: CODESNIPPET .. details
    • any help is greatly appreciated as i am fairly new to java as i come from SAS background.. details
    • Something like this: When empty: CODESNIPPET .. details
    • I have read through the gson documentation but it's going over my head to be honest - lots of new concepts there for me.. details
    • - gson/] It's very easy to integrate on your project and will ease a lot your work to parse the content of the json file.. details
    • Currently I am working on a native android app with webView front end.. details
    • and in activity, I have made an array of dataObject, say dataObject x[5]; Now i want to pass these 5 dataObject to my javascript webView interface as JSON in a callback function.. details
    • Cool and that works, but it seems like so much overhead (**_a whole Type Adapter class?_**).. details
    • With this kind of cursors (a.k.a.. details
    • GSON has a pretty good test case here showing how to define and register a type hierarchy adapter.. details
    • But if I render a JSONContainer object like this: renderJSON(container) how can I pass the serializer classes to the rendering method?. details
    • Have had no success achieving the same result with GSON or Jackson.. details
    • GSON does an excellent job of serializing (converting object to json) complex objects with basically no changes or thought at all on your part, but is a bit slow and memory intensive.. details
    • That being said, I have tailored my JSON to be more suitable for serialization, but overall GSON has been great.. details
    • You might be able to create classes at runtime by parsing the Json string, but I don't know whether that would be worth the hassle.. details
    • The result will be a Map with String keys and either String or Map values.. details
    • If a solution for issue 325 were implemented, this would be easy .. details
    • Everything seems to work fine but when I'm trying to parse a more "complexed" object I'm getting a deserialization error.. details
    • I know to parse when names doesn't have space between, I create class like CODESNIPPET .. details
    • -Is there performance overhead if constantly casting Objects to whatever kind of object is passed to the method?. details
    • There is some documentantion guide#TOC-Serializing-and-Deserializing-Gener [here] which looks like it is close to what I need however it doesn't cover my case.. details
    • The issue is that the articles variable ends up as a list with the correct number of Articles, but all of the data in each Article is null.. details
    • For reference, my Article.java looks like this: .. details
    • If you use Gson, please read doc gson.googlecode.com/svn/tags/1.2.3/docs/javadocs/com/google/gson/Gson.html [here] .As jsonData you can pass string with your json or Reader which streams your json data.. details
    • A FieldNamingPolicy works in the same way.). details
    • Gson can do it similarly simply if you're satisfied with a {"Make":"Ford","Year": 1975, "Model":"Mustang"} , instead of a parseJSON(String jString) .. details
    • A two-dimensional array != a single-dimensional array.. details
    • JsonObject or JsonElement?and how to parse it if I have JsonObject result jarray.get(0).getAsJsonObject().getAsJsonObject("translatedText");String result2 result.toString();it doesnt works.. details
    • GSON is awesome, brings a python like feel to Java, well, atleast for JSON purposes.. details
    • I wish to add some condtional acceptance checks (sanity checks) to the incoming json.. details
    • That's XML, not JSON, mate.. details
    • It works fine after you unzip the package and add the jars in your build path.. details
    • Thank you, I have been using android's offering currently, but I may resort to GSON in the future for more complicated stuff.. details
    • Some good examples and articles.. details
    • Serializing works since you pass it in an actual class, Cat, but deserialization fails since the Exhibition class only has an Animal, gson doesnt know which implementing class to revive.. details
    • thanx , but i tried this it not work for circular dependencies.. details
    • try truncating the incoming string before passing to GSON, so that it looks like this CODESNIPPET .. details
    • Here is a brief tutorial on the same along with WCF example: gson/ [Gson-example/tutorial] Hope the above information would be useful in your context.. details
    • You can register this adapter like: CODESNIPPET .. details
    • Jersey (Use @JsonIgnore instead of @XmlTransient to break the circular dependency) Gson (doesn't support circular references.. details
    • Check this: json-format-gson-api/ [GSon] .It's worth a try with the circular dependencies.. details
    • Dude, you are amazing, thank you so much, it works.My mistake was not create a constructor with no args.Thank you so much!.. details
    • I believe your answer lies in the user-guide#TOC-JSON-Field-Naming-Support [JSON-Field-Naming-Support] : Gson supports some pre-defined field naming policies to convert the standard Java field names (i.e.. details
    • So you may want to consider other libraries: I would recommend Jackson , Gson also works.. details
    • The reason why serialize-a-map-of-a-map-with-gson/4547790#4547790 [Nishant's-answer] works is because Gson's default constructor enables all kind of stuff per default that you would otherwise have to manually enably using the GsonBuilder.. details
    • how can get the value of any JsonElement?. details
    • In the latter case, it's probably easier to use GSON , as recommended by @The Elite Gentleman.. details
    • Note that Jackson fixes these issues, and is faster than GSON.. details
    • Any help gratefully received.. details
    • There are several JSON libraries in Java available which you can implement in your webapp, the popular ones being under each JSON.org , Jackson and Google-Gson .. details
    • Do I have use external parser for that like GSON?. details
    • I'm not married to Gson, so if there's an alternative library that can do this I'd be happy to use it.. details
    • Any plans to support circular dependencies in the near future?. details
    • - gson/] It's very flexible and can handle complexities with objects in a straightforward manner.. details
  • 2. simple decode manually thing kind full bean resolve task offer: 132
    • Well the thing is, I'm not trying to convert the string into java object.. details
    • Google provides [a good json encoding/decoding library]( .. details
    • Yes good idea thank you very much I really appreciate your help, very kind of you.. details
    • Thanks buddy.. details
    • I'm accepting this one as it outlines the key point that "null fields are not serialized", and upvoting the other as it provided the key intuition.. details
    • This is NOT valid JSON!.. details
    • I can use anything else for the mapping like Gson.. details
    • Would you please post more information, what kind of data it is and what kind of data format you want.. details
    • @SB there is no standard.. details
    • How you have resolved your issue?. details
    • The power of GSON is not how fast it parses, but how fast it is to write and maintain the code required for a large number of production cases.. details
    • If you remove them Wrapper[] data gson.fromJson(jElement, Wrapper[].class); works fine for me.. details
    • if you want to gson on client side then you have to try this library .. details
    • you could try gson as well (but it works for draft3 version).. details
    • Usually libraries like GSON or Jackson (mentioned above) offer some validations in this aspect avoiding mal-formed json input, and usually (I have worked with both) they do quite well on performance; also using a json lib would provide you with other functionality to extend in the future if you need.. details
    • it works, thx you.. details
    • } meta: { errors: [] success: 1 }}.. details
    • Thanks mykhaylo ,I will use your provided solution,one question that im not sure that I fully understand is why do i need to provide "entry1List" and 2 also in the code mapping.put("entryList1", "customer"); in my code I can have 1..n entry list not just one or two... mapping.put("entryList2", "Address");.. details
    • How to resolve that.. details
    • (addition to above: official numbers were included -- streaming Gson is faster than databinding, but not up to Jackson performance level).. details
    • Can someone please assist me here?. details
    • I'd add that while the configuration options with Jackson are vast and much more significant than those available with the Gson API, for the simple use case of mapping between data structures requiring minimal custom processing, Jackson, like Gson, provides for a simple one line solution.. details
    • A post by Jason about json, talking about jackson and then resolved with some code from Gson.. details
    • Hi Alexey,thanks for your comment.. details
    • Simple example: Define the class(s) you want to map the json data to: CODESNIPPET .. details
    • This is Simples Bean class containing a Map CODESNIPPET .. details
    • I would like to quick and simple to parse it.. details
    • Or GSON Super easy (no getters/settres, no annotations or configurations needed).. details
    • Yes, i've missed TypeTokens in my code, after fixes all works perfectly.. details
    • To do something like that, you can use JsonParser class that returns you a browsable tree of objects and then fire a standard Gson deserialization.. details
    • Here is the URL which calls the API String api_url = "http://api.trakt.tv/show/season.json/<api-key>/the-walking-dead/1"; And here is the corresponding JSON response !. details
    • I've been always using Gson to parse my json objects, but how can i parse this kind of file ?. details
    • I'm not sure if it's the best approach, but it's pretty straightforward.... details
    • I use jsonparser, but thanks.. details
    • GSON is definitely not the defacto standard for JSON processing in Java.. details
    • Try some thing like below:Take a bean eg: ExampleBeanIn ExampleBean take a propetry of another List of Your Values eg: List values; And then try to convert GSON to List like below CODESNIPPET .. details
    • But havent had any luck.. details
    • Gson does not have any support for this (there is no requirement for JSON to be encoded in ASCII).. details
    • In languages like Python, this is easily done, because the default setting in the standard Python JSON library has ensure_ascii=True: CODESNIPPET .. details
    • How to parse this kind of json String using Gson?. details
    • JsonResponse Object simple form: CODESNIPPET .. details
    • Zip Object simple form: CODESNIPPET .. details
    • Too much code for this task, checkout this library It uses GSON internally and provides API that works with objects.. details
    • The rest should be pretty trivial (Make a generic type class), check out the GSON docs if you're really having trouble.. details
    • That's it, but how can I serialize a pojo or simple Java object(like a Map) direct to JSON?, something like I do in Gson: CODESNIPPET .. details
    • I am currently working on a thin-client application, where the communication happens through JSON-serialized message objects.. details
    • It's valid for class files, but GSON clearly doesn't like it, so you should avoid the option.. details
    • Something like this should work for you, although obviously the best thing would be fix the serialization issue!. details
    • I convert the image to byte array like this : CODESNIPPET .. details
    • And I'm converting the icon from byte array to Bitmap like this : CODESNIPPET .. details
    • Always use libraries for this kind of things!. details
    • Once you have your JSON request parsed into your class, you can transfer the data from the _wrap_ class to a concrete XxxxRequest object, something like: CODESNIPPET .. details
    • Note that this approach gets a bit more tedious if you have many different JSON requests and those requests are very different to each other, but even so I think is a good and very simple approach... .. details
    • I am working on some server code, where the client sends requests in form of JSON.. details
    • The "json string" is a mess, not a valid JSON string.... details
    • I can turn it into List<Foo> pretty simply with GSON, like this: CODESNIPPET .. details
    • Now i using gson to parse this values, Every thing is working up-until OrderDetail but when i try to loop throw "subItemPart" I'm unable to retrieve values of subItemPart object.. details
    • I have a simple JSON file I'd like to parse (units.json) using gson and Java: CODESNIPPET .. details
    • In addition, Google-GSON is an awesome library for serializing Java objects into JSON.. details
    • So first I'm asking if someone could be so kind as to point out what my desired JSON _should_ look like in order to be proper; and then second if someone could help me massage my widgetGroups list so that either Java JSON or GSON can produce the desired output.. details
    • I'm not quite familiar with Gson, but I know it's pretty commonly used today, and your code seems no problem.. details
    • The best thing to do is get into GSON.. details
    • the full JSON file can be seen api.wordpress.com/rest/v1/sites/drewmore4.wordpress.com/posts/?pretty=1 [here:] EDIT: SOLVED.. details
    • But In JSON, each child of message_defualts is having different name like LabResultsRequestDefaultMessage, ReferralRequestDefaultMessage etc which are being reflected in POJO MessageDefault.java.. details
    • I am working a simple facade for JSON mapping libraries.. details
    • Is there any way where I can set value of key1 to some value (let say "Test") in each array, without converting things into POJO .. details
    • I might go back to it depending on how things go later down in the application because it works well with bi-directional relationships without requiring you to "mute" one side.. details
    • On server side you could also use standard Grails JSON converter (but you could use Gson, if you prefer), see .. details
    • This is how initial json looks like CODESNIPPET .. details
    • To make things clear: Supoose I have a simple Object like this CODESNIPPET .. details
    • The communication structure is like CODESNIPPET .. details
    • How do I resolve this?. details
    • JSON.NET byte arrays, are not interpreted the same way as that of gson - so it wont work without writing a JSON.NET compatible deserializer I think you need to keep looking at the data, try changing encodings and also, see if you can get a gson parser for java that gives you more control then this one does :) .. details
    • and decode like: CODESNIPPET .. details
    • Take a look at the GSON Library: Here are good examples: TOC-Primitives-Examples [ TOC-Primitives-Examples CODESNIPPET .. details
    • I would like to use this kind of Objects with json: CODESNIPPET .. details
    • I would be grateful to any pieces of advice.. details