I've fixed the problem in the Microcontainer trunk, but I haven't closed the task, because I'm not sure whether it should be assigned to beta5 or beta6, see the other thread? MC JIRA Task http://jira.jboss.com/jira/browse/JBMICROCONT-212 When I update the AS to beta5 and copy the deployers-impl manually into the AS, I no longer see the "already installed" message when re-running the appclient test. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4098836#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...