The config you posted is partial, so I don't know if it is right or wrong. In the AS 4.x distributions see the server/all/deploy/deploy-hasingleton-service.xml for an example of how to deploy a BarrierController mbean in combination with an HASingletonController mbean. With such a config, the Barrier will only be in the start state on one node. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4188644#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...