"ChristopheMiro" wrote : I had the same problem on a SERIAL field on a postgresql database and we solved this using @GeneratedValue(strategy=GenerationType.IDENTITY) and letting the database using the sequence automaticaly. | | Christophe Thanks for the suggestion but I'm using Oracle. I don't think it supports GenerationType.IDENTITY I have posted the same question in the Hibernate JPA forum: http://forum.hibernate.org/viewtopic.php?t=971878&highlight=hibernate... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4026235#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...