&quot;bela(a)jboss.com&quot; wrote : JBoss's concurrent.jar is based on the same sources, but recompiled. So, go ahead and replace the one from JGroups with the one from JBoss, no problem. Thanks. I placed the jgroups-all.jar which was part of the JGroups zip in the $JBOSS_HOME/server/<my server>/lib folder. Is there a way to verify it is picking this newly deployed JGroups jar? Thanks Ramdas View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4067679#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...