I have a table with an auto-incrementing ID with a datatype of BIGINT(20). When SeamGen using 2.0.0.CR2 generates this entity it gives the ID a datatype of Long. When I try to persist an instance of this entity I get an InvalidStateException. If I change the entity setting the datatype of the ID to long (primitive) I have no problems. Does anyone know what's up with that? Cheers, Damian. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4098234#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...