It's worth noting that I can see a argument in favour of factoring out JMX from HASingletonSupport. For example, you could factor sending JMX HASingletonSupport when stop-being/becoming master by injecting this aspects via AOP as the forum thread in the JIRA suggests. But then again, does it make sense for HASingletonSupport to be a Pojo? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4090822#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...