You need to copy over jbossha.jar and jgroups.jar from all/lib to default/lib. If you want to use JBoss Cache you need jboss-cache.jar as well. For more semi-related info see http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossASTuningSliming. Towards the bottom there's a section on removing clustering features from 'all'. You can use that to get a better understanding of what stuff in 'all' does what. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4044801#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...