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I've created REST service which returns ExceptionEntity serialized class as a result if something gone wrong. I want to throw some exception if json which should be deserialized by Gson.fromJson() is in different type. For example I've got this string which should be deserialized (my.ExceptionEntity.class): {"exceptionId":2,"message":"Room aaaa already exists."} but I use Room class as type for this serialized string: String json = "{\"exceptionId\":2,\"message\":\"Room aaaa already exists.\"}"; Room r = gson.fromJson(json, Room.class); // as a result r==null but I want to throw Exception; how? [EDIT] I've tested this and it doesn't work: try { return g.fromJson(roomJson, new TypeToken<Room>(){}.getType()); // this also doesn't work // return g.fromJson(roomJson, Room.class); } catch (JsonSyntaxException e) { pepuch.multiplayergame.entity.Exception ex = g.fromJson(roomJson, pepuch.multiplayergame.entity.Exception.class); throw ExceptionController.toGameServerException(ex); } catch (JsonParseException e) { pepuch.multiplayergame.entity.Exception ex = g.fromJson(roomJson, pepuch.multiplayergame.entity.Exception.class); throw ExceptionController.toGameServerException(ex); }

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