The only downside is that your config is repeated twice (once on tomcat, once on JBoss). Imo, if there is a communication problem with external systems, than there is a problem in the architecture ;-) The biggest plus for having separate process engines is that each instance can be controlled on its on. Say you want to migrate the tomcat version to another DB, or upgrade the tomcat version only, than this approach lets you do exactly that. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4252988#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...