No really good ideas. One odd thing was in your steps 1 and 2: Object val=treeCache.getObject("OURCACHE",key) Should that be Object val = treeCache.get(nodename, key) You already confirmed it should be "get" not "getObject". But is the Fqn you are using the same as what you used in the treeCache.getKeys() call? Also, does using REPEATABLE_READ help? What you are doing is pretty similar to JBoss AS HttpSession replication with ATTRIBUTE granularity. Only difference is you are doing the updates to the cache via a Synchronization. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3997566#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...