create a sequence in the databse like this create sequense seq minvalue 100000 maxvalue 999999 start with 100000 increment by 1 nocache cycle then set entity bean like this @Id @GeneratedValuesstratege=GenerationType.SEQUENCE) if you want more information about you can look up in the EJB3.0 help ducument .you can download it from www.sun.com.or write to me xiaopang106(a)126.com you could hava a try but i am not sure it will work by the way ,how long hava you learn EJB3.0 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4136983#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...