You need to post your *-ds.xml file as well as the version and type of MSSQL driver. Also, MS-SQL version would be good as well. The exeption you are seeing is typically the result of a SQL not being about to be executed on constructing a connection. This is usually specificied in your *-ds.xml file as <new-connection-sql>SOME SQL</new-connection-sql> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973427#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...