We are having similar problem with JBoss 4.0.5 GA in a cluster. From the documentation of JBossAS, it seems we don't have to anything special for MDBs to work with HA-JMS. We have already configured the cluster to use HA-JMS. But we get this exception from LRUCache under load after some time. Can someone point me in correct direction to fix this issue? Meghana View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4247930#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...