Ok.. I figured it out.. sorta. The problem is: | | @Entity | public class Workout implements Serializable { | | @Id @NotNull @GeneratedValue | private Long id; | When I call em.persist(workout) it fails validation because id is null.. If I take out @GeneratedValue and add an ID manually, all is OK. Why isn't @GeneratedValue working ? J View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4072676#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...