Ah ok thanks, So I'm using JBM 1.4.0 SP3 I have a clustered application deployed however only one of those nodes is allowed to process messages on given queue. I want it so that there can only be one node that has the MDB active at any given time in the cluster but if/when that node goes down another node will start its MDB. I guess follows the HASingleton or whatever you call it with JBoss MQ Thanks! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4176006#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...