Thank everyone in advance! My situation: I was making the jboss default supports custer, i move the below files into default: 1.all\lib\jgroups.jar,jboss-cache.jar,jbossha.jar 2.all\deploy\cluster-service.xml 3.all\deploy\deploy-hasingleton-service.xml 4.all\deploy-hasingleton\jms\* 5.all\deploy\jms\* 6.all\deploy\ejb3-*.xml I just use HA-JMS+Loadbalanced MDBs. My Quuestion: Why URLDirectoryScanner redploy cluster-service.xml again and again, the MBeanException error is encountered? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4184142#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...