hi, I use eclipse and jboss 4.2.2. I created a EAR project (enterprise application project) which contains 2 sub-projects : an EJB project which contains some EJB and a JPA entity, and a java project which contains the client "main" method. here is my problem : nothing at the writing of the code, but an error at the deployment : anonymous wrote : javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: source_jpa.customer.Customer | at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:629) | at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:218) | at org.jboss.ejb3.entity.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:182) | at ejb.customer.CustomerBean.createCustomer(CustomerBean.java:45) the createCustomer method is the following : public Customer createCustomer(Customer customer, Address homeAddress) { | if (customer==null) | throw new ValidationException("customer object is null"); | customer.setHomeAddress(homeAddress); | em.persist(customer); | | return customer; I checked the mysql database, and the "t_customer" table exists but it is empty. for a better understanding, here is the JPA class: package source_jpa.customer; | | import java.io.Serializable; | import java.util.Calendar; | import java.util.Date; | import java.util.GregorianCalendar; | | import javax.persistence.CascadeType; | import javax.persistence.Column; | import javax.persistence.Entity; | import javax.persistence.FetchType; | import javax.persistence.GeneratedValue; | import javax.persistence.GenerationType; | import javax.persistence.Id; | import javax.persistence.JoinColumn; | import javax.persistence.OneToOne; | import javax.persistence.PostLoad; | import javax.persistence.PostPersist; | import javax.persistence.PostUpdate; | import javax.persistence.PrePersist; | import javax.persistence.PreUpdate; | import javax.persistence.Table; | import javax.persistence.Temporal; | import javax.persistence.TemporalType; | import javax.persistence.Transient; | | import source_jpa.Address; | import source_jpa.exception.ValidationException; | | //{|} | @Entity | @Table(name="t_customer") | public class Customer implements Serializable{ | | @Id | @GeneratedValue(strategy=GenerationType.AUTO) | private Long id; | | @Column(unique=true,nullable=false,length=8) | private String login; | | @Column(nullable=false,length=8) | private String password; | | @Column(nullable=false,length=30) | private String firstname; | | @Column(nullable=false,length=30) | private String lastname; | | private String telephone; | private String email; | | @Column(name="date_of_birth") | @Temporal(TemporalType.DATE) | private Date dateOfBirth; | | @Transient | private Integer age; | | @OneToOne(fetch=FetchType.EAGER,cascade=CascadeType.ALL) | @JoinColumn(name="address_fk",nullable=true) | private Address homeAddress; | | @PrePersist | @PreUpdate | private void validateData() throws ValidationException{ | | if (firstname==null || firstname.equals("")) | throw new ValidationException("Invalid first name"); | if (lastname==null || lastname.equals("")) | throw new ValidationException("Invalid last name"); | if (login==null || login.equals("")) | throw new ValidationException("Invalid login"); | if (password==null || password.equals("")) | throw new ValidationException("Invalid password"); | | } | | @PostLoad | @PostPersist | @PostUpdate | public void calculateAge(){ | | if (dateOfBirth==null){ | age=null; | return; | } | Calendar birth=new GregorianCalendar(); | birth.setTime(dateOfBirth); | Calendar now=new GregorianCalendar(); | now.setTime(new Date()); | int adjust=0; | if (now.get(Calendar.DAY_OF_YEAR)-birth.get(Calendar.DAY_OF_YEAR)<0) | adjust=-1; | age=now.get(Calendar.YEAR)-birth.get(Calendar.YEAR)+adjust; | | } can you help me? olivier. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4214654#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...