Generator - Best way to support custom user extension

Hi, 

I'm writing a JSON serialization/deserialization mechanism and I'm looking for advices :)

Currently, to use it, you do something like :

public interface PersonMapper extends ObjectMapper<Person> {}

PersonMapper mapper = GWT.create(PersonMapper.class);

And the library is generating the implementation. 

I have abstract JsonSerializer and JsonDeserializer classes with default implementation for base type like String, Integer, List. The rest is considered as a POJO and the generator creates the implementation.

It works great but it's not possible to define custom serializer. For example, if a user wants to serialize a Guava collection, the generator don't know the type, will consider it as a POJO and probably fail.

I want to be able to define custom JsonSerializer and that the generator uses it instead of treating the type as a POJO.

What would be the best way to achieve this ? 

Should I scan all the packages/classes in the oracle looking for JsonSerializer implementation ? Or a specific annotation maybe ?

Thanks

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