Hi Friends,

I have a Person entity and Address entity and there is @OneToMany relation b/w Person and address.

See below mapping

===================

@Entity
@Table(name="Person")
public class Person {
@Id
@GeneratedValue
@Column(name = "p_id")
private Long id;
@OneToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.REMOVE, CascadeType.REFRESH })
@JoinColumn(name = "p_id")
private List<Address> addressList = new ArrayList<Address>();

setters and getters...

==========================================
@Entity
@Table(name="ADDRESS")
public class Address implements Serializable{

/**
*
*/
private static final long serialVersionUID = 1L;

@Id
@Column(name="ADD_ID")
@GeneratedValue
private Long id;
@Column(name="p_id")
private Long addId;

setter and getter

====================

I am creating Person object and Address objects and adding Address object to Person object like below

---------------------------------------------------
Person p1=new Person();
Address a1= new Address();
Address a1= new Address();
p1.getAddressList().add(a1);
p1.getAddressList().add(a1);

em.persist(a1);
em.flush();

Person person1 = em.find(Person.class, 1L);
System.out.println(person1.getAddressList(0).getAddId()); // getting addId value as null. here i am not closing entity manager and using same for find operation

// if close entity manager and open new entity manager then i am getting addId like 1,2

em.close();
em = entityManagerFactory().createEntityManager();

Person person1 = em.find(Person.class, 1L);

System.out.println(person1.getAddressList(0).getAddId()); // here i am getting 1
System.out.println(person1.getAddressList(1).getAddId()); // here i am getting 2

If I use same entitymanager to retrive address list from person entity addId is coming as null.
If close entity manager and open new entity manager then i am getting addId like 1,2...


Can you guys explain why jpa has implemented in this way?

Thanks in Advance... Sud

Hi Friends...
Any help?

Any help from this forum?

Hi All,

I have fixed the above problem.
after persisting person object and called entityManager.refresh(personobject).
Thanks,
Sudharsana M