But the real reason, as Clebert has pointed out, is probably that when you installed you created a non clustered hsql installation (hsql can't be used for a clustered install) - you will notice "clustered=false" in the hsql-persistence-service.xml. When you copied over mysql-persistence-service.xml, you will notice "clustered=true". If you don't want clustering set to false. If you do, you will have to make sure you installed in the "all" configuration since this is the one that contains all the clustering stuff, like JGroups. I believe this is all covered in the userguide. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074680#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...