That should not be a problem if you make sure to have your data sources configured with one unique jndi-name. Yes, the jndi name in the persistence.xml is static, but it does a name lookup and as long as your *-ds.xml maps the database to the same name, it could just work. Just note that this presumes that only *one* *-ds.xml uses that jndi name. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4137669#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...