code: @Override
      public void serialize(JsonObject value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
          gen.writeObject(value.getMap());
      }
docs: Method that can be called to ask implementation to serialize
  values of type this serializer handles.
  
  @param value       Value to serialize; can <b>not</b> be null.
  @param gen         Generator used to output resulting Json content
  @param serializers Provider that can be used to get serializers for