android - NullPointerException on GSON Parsing -

i use gson parse json data, , app able parse google geocoder this. but, whenever try parse json website gives nullpointerexception

this eventresponse class makes connection btw gson , website

public class eventresponse {     public meta meta;     public objects[] objects;      public eventresponse() {}      public class meta {         public int limit;         public string next;         public int offset;         public string previous;         public int total_count;     }      public class objects {         public string category;         public string date;         public string description;         public int id;         public string name;         public string resource_uri;         public string venue;     } } 

this json

{     "meta": {         "limit": 20,         "next": null,         "offset": 0,         "previous": null,         "total_count": 7     },     "objects": [         {             "category": "/api/v1/category/1/",             "date": "2013-05-01",             "description": "beş yakın arkadaş, ", //description longer in real             "id": 10,             "name": "kötü ruh / evil dead",             "resource_uri": "/api/v1/event/10/",             "venue": "/api/v1/venue/3/"         },         {             "category": "/api/v1/category/1/",             "date": "2013-05-02",             "description": "filmde, küçümseyen, ",             "id": 9,             "name": "korkunç bir film 5 / scary movie 5",             "resource_uri": "/api/v1/event/9/",             "venue": "/api/v1/venue/6/"         }     ] } 

this how use gson (i tried objects[0] also, didn't matter)

gson gson = new gson();         eventresponse eresult = new eventresponse();         try {             eresult = gson.fromjson(jsoncoord((caturl + categories.catid)),                     eventresponse.class);              log.i("ama"+eresult.objects[1].category, "deneme"); 

jsoncoord method

public string jsoncoord(string address) throws ioexception {         url url = new url(address);         urlconnection connection = url.openconnection();         bufferedreader in = new bufferedreader(new inputstreamreader(                 connection.getinputstream()));         string inputline;         string jsonresult = "";         while ((inputline = in.readline()) != null) {             jsonresult += inputline;         }         in.close();         return jsonresult;     } 

and cannot value log. error stack this: (line 59 log line)

05-02 21:48:32.020: w/system.err(17456): java.lang.nullpointerexception 05-02 21:48:32.030: w/system.err(17456):    @ com.myapp.myapp.events.getvenue(events.java:59) 05-02 21:48:32.030: w/system.err(17456):    @ com.myapp.myapp.events.oncreate(events.java:48) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activity.performcreate(activity.java:5206) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1083) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2064) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2125) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activitythread.access$600(activitythread.java:140) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activitythread$h.handlemessage(activitythread.java:1227) 05-02 21:48:32.030: w/system.err(17456):    @ android.os.handler.dispatchmessage(handler.java:99) 05-02 21:48:32.030: w/system.err(17456):    @ android.os.looper.loop(looper.java:137) 05-02 21:48:32.030: w/system.err(17456):    @ android.app.activitythread.main(activitythread.java:4898) 05-02 21:48:32.030: w/system.err(17456):    @ java.lang.reflect.method.invokenative(native method) 05-02 21:48:32.030: w/system.err(17456):    @ java.lang.reflect.method.invoke(method.java:511) 05-02 21:48:32.030: w/system.err(17456):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1006) 05-02 21:48:32.035: w/system.err(17456):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:773) 05-02 21:48:32.035: w/system.err(17456):    @ dalvik.system.nativestart.main(native method) 

as has been pointed out, problem name of field.

in class name "objects", in json response, "objects" (lowercase). name of variable in program , in json must same, because gson allows json response fields you're interested in... if founds json value in response doesn't correspond of class attributes, gson ignore value.

you use annotation @serializedname, in way:

@serializedname("objects") private objects[] whatevername; 

this way can have different names in class , in json response.

note: type of attribute doesn't have problem. class objects should written in uppercase follow java naming conventions...