java - Gson deserialize JSON array as Object -

i've got object, need deserialized / unmarshalled json (using gson). problem 1 of properties, in javabean, complex object, needs serialized fron json array of numbers:

the json (somewhat similar to):

{     "name": "john doe",     "location": [         9.560006,         55.719474     ], } 

the targeted classes (somwaht similar to):

class userlocation {     private string name;     private location location;     // ... "zero-args constructor", get'ers , set'ers } class location {     private double longitude;     private double latitude;     // ... "zero-args constructor", get'ers , set'ers } 

my gsonbuilder configured as:

new gsonbuilder()     .registertypeadapter(location.class, new locationtypeconverter())     .create(); 

where locationtypeconverter looks this:

public class locationtypeconverter extends typeadapter<location> implements jsonserializer<location>, jsondeserializer<location> {     private static final int longitude_index = 0;     private static final int latitude_index = 1;      @override     public jsonelement serialize(location src, type srctype, jsonserializationcontext context) {         jsonarray array = new jsonarray();         array.set(latitude_index, new jsonprimitive(src.getlatitude()));         array.set(longitude_index, new jsonprimitive(src.getlongitude()));         return array;     }      @override     public location deserialize(jsonelement json, type type, jsondeserializationcontext context) throws jsonparseexception {         jsonarray array = json.getasjsonarray();         return new location(array.get(latitude_index).getasdouble(), array.get(longitude_index).getasdouble());     }      @override     public void write(jsonwriter out, location value) throws ioexception {         out.beginarray().value(value.getlongitude()).value(value.getlatitude()).endarray();     }      @override     public location read(jsonreader in) throws ioexception {         in.beginarray();         double longitude = in.nextdouble();         double latitude = in.nextdouble();         in.endarray();         return new location(longitude, latitude);     } } 

but no avail, since keep recieving following stacktrace:

     retrofit.retrofiterror: com.google.gson.jsonsyntaxexception: java.lang.illegalstateexception: expected begin_object begin_array @ line 1 column 85 path $[0].location             @ retrofit.restadapter$resthandler.invokerequest(restadapter.java:377)             @ retrofit.restadapter$resthandler.access$100(restadapter.java:220)             @ retrofit.restadapter$resthandler$2.obtainresponse(restadapter.java:278)             @ retrofit.callbackrunnable.run(callbackrunnable.java:42)             @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)             @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)             @ retrofit.platform$android$2$1.run(platform.java:142)             @ java.lang.thread.run(thread.java:818)      caused by: retrofit.converter.conversionexception: com.google.gson.jsonsyntaxexception: java.lang.illegalstateexception: expected begin_object begin_array @ line 1 column 85 path $[0].location             @ retrofit.converter.gsonconverter.frombody(gsonconverter.java:67)             @ retrofit.restadapter$resthandler.invokerequest(restadapter.java:362)             at retrofit.restadapter$resthandler.access$100(restadapter.java:220)             at retrofit.restadapter$resthandler$2.obtainresponse(restadapter.java:278)             at retrofit.callbackrunnable.run(callbackrunnable.java:42)             at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)             at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)             at retrofit.platform$android$2$1.run(platform.java:142)             at java.lang.thread.run(thread.java:818)      caused by: com.google.gson.jsonsyntaxexception: java.lang.illegalstateexception: expected begin_object begin_array @ line 1 column 85 path $[0].location             @ com.google.gson.internal.bind.reflectivetypeadapterfactory$adapter.read(reflectivetypeadapterfactory.java:200)             @ com.google.gson.internal.bind.reflectivetypeadapterfactory$1.read(reflectivetypeadapterfactory.java:103)             @ com.google.gson.internal.bind.reflectivetypeadapterfactory$adapter.read(reflectivetypeadapterfactory.java:196)             @ com.google.gson.internal.bind.typeadapterruntimetypewrapper.read(typeadapterruntimetypewrapper.java:40)             @ com.google.gson.internal.bind.collectiontypeadapterfactory$adapter.read(collectiontypeadapterfactory.java:81)             @ com.google.gson.internal.bind.collectiontypeadapterfactory$adapter.read(collectiontypeadapterfactory.java:60)             @ com.google.gson.gson.fromjson(gson.java:810)             @ com.google.gson.gson.fromjson(gson.java:775)             @ retrofit.converter.gsonconverter.frombody(gsonconverter.java:63)             at retrofit.restadapter$resthandler.invokerequest(restadapter.java:362)             at retrofit.restadapter$resthandler.access$100(restadapter.java:220)             at retrofit.restadapter$resthandler$2.obtainresponse(restadapter.java:278)             at retrofit.callbackrunnable.run(callbackrunnable.java:42)             at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)             at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)             at retrofit.platform$android$2$1.run(platform.java:142)             at java.lang.thread.run(thread.java:818)      caused by: java.lang.illegalstateexception: expected begin_object begin_array @ line 1 column 85 path $[0].location             @ com.google.gson.stream.jsonreader.beginobject(jsonreader.java:387)             @ com.google.gson.internal.bind.reflectivetypeadapterfactory$adapter.read(reflectivetypeadapterfactory.java:189) 

the 2 classes needs deserialized (the 1 containing location instance , "wrapping" object both simple javabean (with appropriate set'er , get'er methods.

none of methods serialize, deserialize nor read being called, doing wrong here?

thanks in advance, help!

edit #1: added target classses / beans clarify object graph i'm trying deserialize to.

this class need ser/des json wrote:

myobject {     public string name;     public float[] location;      public float getlatitude() {         if (location != null) return location[0];         return 0;     }     public float getlongitude() {         if (location != null) return location[1];         return 0;     } } 

while classes wrote have json this:

{     "name": "john doe",     "location": {         "longitude": 9.560006,         "latitude": 55.719474     } } 

and finally, test did code, , works fine! need sure you're using same gson object (the 1 gsonbuilder.create)?

    gson gson = new gsonbuilder()             .registertypeadapter(location.class, new locationtypeconverter())             .setprettyprinting()             .create();      userlocation userlocation = new userlocation();     userlocation.name = "ciao";     userlocation.location = new location(1.0, 3.0);     string json = gson.tojson(userlocation);     system.out.println(json);      userlocation newlocation = gson.fromjson(json, userlocation.class);     system.out.print(newlocation.location.getlatitude());