I stand corrected. It finally DID undeploy the MDBs. One MDB was running when I undeployed. That MDB continued to run (which is correct) and then when it was finished, it sent 2 messages on the Queue which spawned 2 new MDBs. Once those had finished, it undeployed. Is there something inside JBoss that causes the JMS Messages sent from inside a MDB to continue running while a JMS Message sent from outside the MDB waits until the MDBs are undeployed/redeployed again? Very interesting behavior, but I'll take it! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4105640#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...