This assumes that every callback path has an interceptor model that allows this. Its not true for either the ejb2 or web containers. Callbacks like ejb timers, activation callbacks, session events, don't have the same invocation model as requests. There is also the issue of being able to view encs for debugging. Having a bunch of isolated encs buried in various containers vs having a map keyed by component id just seems cleaner. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3995415#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...