I had that earlier. I have no solution at this time, just a work around. I had two entities in my seam-gen.reveng.xml that had previously generated fine. The first time I got the error all I had to do was delete the entities and run seam-gen again. I was not successful with subsequent retries, where I ended up having to delete the entities and run seam-gen once per table: <hibernate-reverse-engineering> | <schema-selection match-schema="DCSCORE"/> | <table-filter match-name="SYS_GROUPS"/> | </hibernate-reverse-engineering> I would like to know a better solution to this... Cheers, Chris. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4050884#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...