How to invoke default deserialize with gson

Question

I get a json that has \"field\" field.
If the \"field\" has data, then there is an OBJECT that has many (about 20) other fields that are also objects. I can deserialize

Answer 1

public class ExtrasAdapter implements JsonDeserializer {
@Override
public Extras deserialize(JsonElement json, Type typeOf, 
              JsonDeserializationContext context) throws JsonParseException {
    try {
        JsonObject jsonObject = json.getAsJsonObject();
        return new Gson().fromJson(jsonObject , Extras.class); // default deserialization

    } catch (IllegalStateException e) {
        return null;
    }
}