need to wrap org.jboss.jca.adapters.jdbc.WrapperDataSource with a serializable DataSource

I'm trying to serialize a extended persistence context from a test case
but
org.jboss.jca.core.connectionmanager.AbstractConnectionManager.writeObject
throws a "java.io.IOException: This method is not supported"

See http://pastie.org/3012563

The org.hibernate.ejb.EntityManagerImpl session, has a
org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.

The
org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess,
has a org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.

The org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider,
has a reference to a org.jboss.jca.adapters.jdbc.WrapperDataSource

the WrapperDataSource has:

• org.jboss.jca.adapters.jdbc.local.LocalManagedConnectionFactory
• org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl
• and other stuff that also might not be serializable.