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

Another FWIW: I believe I cleared up a similar problem in an enum class by changing the access modifier of the single, one argument constructor from default (no modifier) to 'private'. In any event, doing that didn't break it because it's working that way now.