Brian... what about this? - We lookup for the JChannelFactory MBean... - If not found, we create channels as we always used to do. In our configurations we would aways have the MBean name by default, and the JGroups stack to be used case the MBean was not found. This way, if jboss-messaging is deployed on 4.0, we would use the regular Channel, if on 4.2 or 5 we would use the multiplexor. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3997637#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...