Ops, forgot to mention the jboss version i am running. The version is 4.05 GA. The following is the mbean configuration file | <mbean code="test.ASingletonService" | name="jboss.test:service=ASingleton"> | </mbean> | | <mbean code="org.jboss.ha.singleton.HASingletonController" | name="jboss:service=HASingletonControllerMBean"> | <depends>jboss.test:service=ASingleton</depends> | <depends>jboss.ha:service=HASingletonDeployer,type=Barrier</depends> | <attribute name="TargetName">jboss.test:service=ASingleton</attribute> | <attribute name="TargetStartMethod">startASingleton</attribute> | <attribute name="TargetStopMethod">stopASingleton</attribute> | </mbean> Thanks ! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4053529#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...