I'm stuck on the following: I have two message-driven beans MDB1 and MDB2 connected through two JMS queues (each MDB has its own queue). MDB uses a timer service to poll a database every now and then. Both beans have Container as its transaction type, with transaction attribute Required for their method onMessage. Whenever I happen to erroneously create a second timer for MDB2, I see that new instances of MDB2 are created (I'm logging the ejbCreate method) which finally hog my server, bringing it to a grinding halt. I suspect duplicate MDB2 beans are created though transaction rollback, but as I don't see any other error messages, I'm completely clueless. Also, I'd like to associate one single timer with MDB2, but I cannot seem to create it in the ejbCreate method. What is the standard approach here? Any help is appreciated... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4133763#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...