How to best (de)-serialize objects?

Hi,

I want to serialize a bunch of objects to a file, and later derserialize it.
The purpose is to let a user draw something on a canvas, save the objects representing the drawing to a file, and later continue it's work.

So I'm probably looking for a way of JSON. I read of JSNI and GWT Overlay Types. But this would mean I have to manually define every property that is to be serialized back and forth.

Isn't there anything build-in mechanism to just save a whole bunch of objects/beans to JSON and later just read it and recreate the object? Without having to care about all properties contained?

Thanks

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