AutoBean sample not working for me?

Hi,

I copy / pasted the AutoBean serialization example from here:

    http://www.gwtproject.org/doc/latest/DevGuideAutoBeans.html

I've implemented the necessary interfaces etc to setup a quick test which can be summarized as follows:

    PersonImpl person = new PersonImpl();

    person.setName("me");

    person.setAddress(new AddressImpl(...));

    DoSomething test = new DoSomething();

  String json = test.serializeToJson(person);

The value of "json" is null. 

Is this sample working for everyone? I'm using GWT 2.7 with java 1.7.

Thanks

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