Use Hibernate annotations and generated values. This is a very quick example, and may not work out of the box. | public class Parent { | | @Id | @GeneratedValue(strategy = GenerationType.SEQUENCE) | private Long id | | @OneToOne | @PrimaryKeyJoinColumn | private Child child; | } | | public class Child { | | @Id | @GeneratedValue(generator="foreignKeyGenerator") | @org.hibernate.annotations.GenericGenerator(name="foreignKeyGenerator", strategy="foreign",parameters=@Parameter(name="property", value="parent")) | | @OneToOne(optional=false) | @JoinColumn(name="id") | private Parent parent; | } | HTH Tim View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4124420#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...