java - Registering multiple adapters with GSON isn't working -

i'm having issue registering multiple typeadapters gsonbuilder. seems 1 fire off , never takes second 1 considering. if each 1 seems work fine. need them work both , seems doing wrong. using gson v2.2.4.

zip object simple form:

public class zip {    private string zipcode;   private string city;   private string state;    public zip(){}                                             } 

zipserializer:

public class zipserializer implements jsonserializer<zip>{      @override     public jsonelement serialize(zip obj, type type, jsonserializationcontext jsc) {         gson gson = new gson();         jsonobject jobj = (jsonobject)gson.tojsontree(obj);         jobj.remove("state");                 return jobj;     }  } 

jsonresponse object simple form:

public class jsonresponse {      private string jsonrpc = "2.0";      private object result = null;     private string id = null;      public jsonresponse(){}  } 

jsonresponseserializer:

public class jsonresponseserializer implements jsonserializer<jsonresponse> {      @override     public jsonelement serialize(jsonresponse obj, type type, jsonserializationcontext jsc) {         gson gson = new gson();         jsonobject jobj = (jsonobject)gson.tojsontree(obj);         jobj.remove("id");          return jobj;     }  } 

test example:

public class test {      public static void main(string[] args) {         zip zip = new zip();         zip.setcity("testcity");         zip.setstate("oh");         zip.setzipcode("12345");          jsonresponse resp = new jsonresponse();         resp.setid("1");         resp.setresult(zip);         resp.setjsonrpc("2.0");          gson gson1 = new gsonbuilder()         .registertypeadapter(jsonresponse.class, new jsonresponseserializer())         .registertypeadapter(zip.class, new zipserializer())         .setprettyprinting()         .create();           string json = gson1.tojson(resp);         system.out.println(json);                     }  } 

output:

{   "jsonrpc": "2.0",   "result": {     "zipcode": "12345",     "city": "testcity",     "state": "oh"   } } 

expected output: (notice zipserializer didn't fire off)

{   "jsonrpc": "2.0",   "result": {     "zipcode": "12345",     "city": "testcity"   } } 

i simpled down test case this. know can use exclusionstrategy in example achieve results real issue more complex , best way me portray , replicate issue.

thanks

<---------------------------- solution ------------------------------->

i managed read gson custom seralizer 1 variable (of many) in object using typeadapter , helped me out greatly.

i created base customtypeadapterfactory , extended each class needed special serialization.

customizedtypeadapterfactory

public abstract class customizedtypeadapterfactory<c> implements typeadapterfactory {      private final class<c> customizedclass;      public customizedtypeadapterfactory(class<c> customizedclass) {         this.customizedclass = customizedclass;     }      @suppresswarnings("unchecked") // use runtime check guarantee 'c' , 't' equal     public final <t> typeadapter<t> create(gson gson, typetoken<t> type) {         return type.getrawtype() == customizedclass                 ? (typeadapter<t>) customizemyclassadapter(gson, (typetoken<c>) type)                 : null;     }      private typeadapter<c> customizemyclassadapter(gson gson, typetoken<c> type) {         final typeadapter<c> delegate = gson.getdelegateadapter(this, type);         final typeadapter<jsonelement> elementadapter = gson.getadapter(jsonelement.class);          return new typeadapter<c>() {              @override public void write(jsonwriter out, c value) throws ioexception {                                jsonelement tree = delegate.tojsontree(value);                 beforewrite(value, tree);                 elementadapter.write(out, tree);             }               @override public c read(jsonreader in) throws ioexception {                 jsonelement tree = elementadapter.read(in);                 afterread(tree);                 return delegate.fromjsontree(tree);             }         };     }      /**     * override muck {@code toserialize} before written     * outgoing json stream.     */     protected void beforewrite(c source, jsonelement toserialize) {     }      /**     * override muck {@code deserialized} before parsed     * application type.     */     protected void afterread(jsonelement deserialized) {     } } 

ziptypeadapterfactory (did jsonresponsetypeadapterfactory)

public class ziptypeadapterfactory  extends customizedtypeadapterfactory<zip> {      ziptypeadapterfactory() {         super(zip.class);     }      @override     protected void beforewrite(zip source, jsonelement toserialize) {         jsonobject obj = (jsonobject) toserialize;         obj.remove("state");     }  } 

test code:

gson gson1 = new gsonbuilder()         .registertypeadapterfactory(new jsonresponsetypeadapterfactory())                .registertypeadapterfactory(new ziptypeadapterfactory())         .setprettyprinting()         .create();           string json = gson1.tojson(resp);         system.out.println(json); 

thank help.

problem in jsonresponseserializer. create new gson instance, on new instance zipserializeris not registered. that's why second serializer never called.

if want achieve delegation , complex serialization, @ typeadapterfactory.

as said, if want filter fields serialization define exclusionstrategy.