Almost certainly your problem is a config issue or a misunderstanding of how clustering or MDBs work. If you have a support contract someone can take you through it. If you're looking for free support, there have been plenty of threads on this forum on how to configure MDBs with clustered queues. This is something that comes up again and again. You can also try 1.4.0.SP3_CP03 which is the latest version for JBoss AS 4.x (look in svn). http://anonsvn.jboss.org/repos/messaging/tags/ View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4164919#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...