Can you try replacing the <rar-name>firebirdsql.rar</rar-name> by <rar-name>jaybird.rar</rar-name> in firebird-ds.xml? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4006923#4006923 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4006923