For the first one (use of @Embaddable and @Embedded) Customer class must be changed to: | @Entity | public class Customer implements Serializable { | // ... your member fields | private Address address; | // ... your set-/get-Methods | @Embedded | public Address getAddress() { | return address; | } | // ... setter as well | } | For the second one (keeping @Embeddable and building a wrapper): | @Entity | public class AddressWrapper implements Serializable { | | @Id | private String id; | | @Embedded | private Address address; | | // getter and setter | } | In this case your Customer class must be changed like | @Entity | public class Customer implements Serializable { | // ... your member fields | private AddressWrapper address; | // ... your set-/get-Methods | @OneToOne | public AddressWrapper getAddress() { | return address; | } | // ... setter as well | } | For the last one you must change the annotation of Address to @Entity and change your Customer class like the above (without Wrapper). View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216472#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...