Annotate with @Depends("jboss.ha:service=HASingletonDeployer,type=Barrier") If you want only one instance within the jvm, also annotate with @MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName = "maxSession", propertyValue = "1")}) A second node in the cluster will not run this mdb, till the first master node goes away. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4173986#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...