Hi oskar.carlstedt, First of all thanks a lot for your reply . Yes , I am using toplink here and I have already got the clue for ds.xml file but I want to where I should be putting this ds.xml file : 1.Should I pack it in the ear file along with the persistence.xml file OR 2. I should put it in the deploy directory directly , i.e. outside the ear file . Expecting a relief soon from you . Regards View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4058062#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...