"Juergen.Zimmermann" wrote : Now I get a NPE inside JBossMessaging. Therefore, I decided to post to the according user forum http://www.jboss.com/index.html?module=bb&op=viewtopic&t=149712 | My guess (w/ looking at the service's code) would be that the class implments some JMX registry hook. Which probably sets MBeanServer instance. And since this is now plain bean those hooks are not called, but the service still expects MBeanServer to be set. Note: this might be total; shot in the dark. :-) "Juergen.Zimmermann" wrote : | However, there is no reaction. Should I open a JIRA ticket? | No, dig in more. Only once they confirm it as a bug, should you open a JIRA. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4206912#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...