Creating adapter factory to work with GSON.

AutoValueTypeAdapterFactory.java

public class AutoValueTypeAdapterFactory implements TypeAdapterFactory {
    @Override
    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
        Class<? super T> rawType = type.getRawType();
        if (PersonData.class.isAssignableFrom(rawType)) {
            return (TypeAdapter<T>) PersonData.typeAdapter(gson);
        }
        return null;
    }
}