This comment resonates with me especially well today.

I've been attempting to work with GWT and the serialization issues are entertaining (did you implement IsSerializable? is there a no-arg constructor? Do all of the classes your class depend on have the same? Did you remember to recompile the GWT/JS code to update the serialization white list? etc.).

It makes me appreciate more playing with Erlang a while back and shooting data around being so simple.