Hey - thanks - you were right - that was a naming problem between the msql-jdk2-service.xml and the datasource xml! Great! There's now another error Could not find stored procedure 'master..xp_jdbc_open' but I worry that this is a problem of the driver I use, so that this is no problem for this forum here... :-( But nevertheless: Thank you very much! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120423#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...