To futher clarify, currently we use JBoss 4.2.3 in a cluster of two nodes. The services I mentioned depend on the Barrier, this is done by adding a dependency in their configuration: <depends>jboss.ha:service=HASingletonDeployer,type=Barrier</depends> These services work properly in JBoss 4.2.3, but in JBoss 5.0.0.GA they will fail to deploy. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4199689#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...