Only one "defaults" entry is allowed, after all, that is what it is - the default. Are you using EJB 2.x entity beans to store the data in the database? If so, then are you storing some entities in one database and others in another? If not, then standardjbosscmp-jdbc.xml is not used an you can ignore it. Also, if you are not using EJB 2.x entity beans, what are you using to store data? Hibernate? JDBC? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170159#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...