It's trying to deploy an MBean in tree-service.xml that appears to be a java.lang.Object. Did you change this file or where did you get it? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008968#4008968 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4008968