I don't know...
Does that mean XMBean managed operations cannot throw Notifications?
That would be strange.
Just send a notification from your operation implementation.
It's easy to do what you want with an easy-to-write custom interceptor. However, xmbean interceptors are currently hardcoded, so there'd be no easy way of inserting your interceptor in the chain. However, I think Adrian is working on making the interceptor chains configurable.