I m using Oracle DataBase but not as DefaultDS, sp I ve replaced both of the files 'hsql...-service.xml' from deploy/jms by 'oracle...-service.xml'. In the JBoss log file, I can't see that the DefaultDS has been bound, but the hsql-ds.xml is in deploy. If I hot deploy, all JMS_MESSAGEs are stored in our Oracle DB, and no exception is thrown. I don't know what is referencing the DefaultDS in this config. Thanks for you answer View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085411#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...