Hi, Thank you genman with the help with the sequence. I'm now with another error. I need an sequence for each table so I changed my code according to your information and worked with the sequence but now I'm getting an error with the foreign key. I have two entity beans Person and Address both of them with the key being generated by two different sequences: person_seq and address_seq. Person has an foreign key that references the field "id" of the Address table. In the Person ejb I have: | @Entity | @SequenceGenerator(name = "PERSON_SEQ", sequenceName = "PERSON_SEQ") | | @Id | @GeneratedValue(strategy=GenerationType.AUTO, generator = "PERSON_SEQ") | public int getId() { | return id; | } | | @ManyToOne(cascade=CascadeType.ALL) | @JoinColumn(name="addressId", referencedColumnName="id") | public Address getAddress() { | return address; | } | In the Address ejb I have: | @Entity | @SequenceGenerator(name = "ADDRESS_SEQ", sequenceName = "ADDRESS_SEQ") | | @Id | @GeneratedValue(strategy=GenerationType.AUTO, generator = "ADDRESS_SEQ") | public int getId() { | return id; | } | Both tables are empty and I'm trying to add an register in the table Person and Address but I'm getting the following error: ORA-02291: integrity constraint (ADM.FK_ADDRESS) violated - parent key not found I'm getting some warns when I start JBOSS: "14:32:28,570 WARN [Ejb3Configuration] Persistence provider caller does not implements the EJB3 spec correctly. PersistenceUnitInfo.getNewTempClassLoader() is null." "14:32:28,898 WARN [AnnotationBinder] Hibernate does not support SequenceGenerator.initialValue()" Do you think these warns have to do with the error message? I'm using Oracle as database. Thank you. Nei View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4073675#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...