Ah - I finally found the issue... Changes to JBossASKernel in ejb3 as module (r82684) dropped a re-entrancy requirement for EJBContainer.create() - which previous prevented the service mbean from deploying. In r82615, EJBContainer.create() is not re-entrant. The previous version (that utilized a ReentrantReadWriteLock) was at least thread re-entrant. I'll add re-entrancy for create() and destroy() (as it was for start() and stop() are re-entrant already) and get this tested and patched today. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4201038#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...