It was the many to many relationship. I can duplicate this problem in all of my schemas. Simply create three tables. Table A, Table B, Table C. Table A and Table C have a many to many relationship. Table B is the link between them that just contains Table A and Table C primary keys with foreign key constraints to the appropriate tables. Then run seam generate-entities - I can't think of a scenario where this is something specific to my environment, but maybe I am missing something. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4031218#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...