Hi Daniel, what you do is deploy the MDB as HASingleton and the timer will only have one server with this special MDB. But the timeout will happen for each node, because the TIMER-table is the same for all. What I need is a real cluster aware timer where a SLSB|MDB can create a timer and it is ensured within the hole cluster that this SLSB is only started once if the timer exceed, also if the SLSB|MDB is active at each cluster node. So your workaround didn't works for me. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4176094#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...