Gson "toJson" on annonymus objects returns null

Question

I wanted to make an anonymous object to String using Gson.

my object is not null, but yet the method "toJson" return null.

How can i fix this?

Answer 1

From the users guide:

Gson can also deserialize static nested classes. However, Gson can not automatically deserialize the pure inner classes since their no-args constructor also need a reference to the containing Object which is not available at the time of deserialization.

Gson doesn't do the serialisation and returns null. You can use a static nested class instead of a anonymous inner class.