No offense taken. A read the manual response is an appropriate one, however I wasn't clear on exactly which doc I need to read. I've changed the default data source to use our MySQL cluster for all of JBoss. In the JBoss AS documentation, it simply defines the default source as MySQL, and doesn't mention any further changes. I'm assuming that I need to re-configure jboss messaging on top of changing the default data source as outlined here? http://www.jboss.org/file-access/default/members/jbossmessaging/freezone/... I apologize for the obvious questions, but I couldn't find anything in the AS doc that references the Messaging configuration change. I thought changing the data source was all that is required. I also don't have the example files described in the doc for persistence. Only the "null-persistence-service.xml" file. I created my installation from the 1.2.1 JEMS installer, does it not install alternative configuration files? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4144346#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...