I'm trying to serialize an extended persistence context from an AS7 unit test, which involves serializing whatever org.hibernate.service.internal.StandardServiceRegistryImpl.wroteObject includes. I started getting working on this last night and have worked through the AS7 ModuleClassLoader and DataSource objects so far. The next NotSerializableException is for the org.hibernate.service.internal.StandardServiceRegistryImpl instance. The exception call stack is here http://pastie.org/3018508 I just wanted to let people know that I'm investigating this. Scott