SerializationPolicy error when performing RPC from within GWT application

Question

I\'m getting the following exception:

com.google.gwt.user.client.rpc.SerializationException: Type \'java.lang.Long\' was not included in the set of ty

Answer 1

FWIW, I was having this problem but my 'Object' type was hidden behind generified classes. The error message itself was wrong.

So if one of your rpc methods involves a class:

class Xxx implements IsSerializable {...

It needs to change to:

class Xxx implements IsSerializable {...