Hello,
Why do you set the @Basic annotation though the employee is not a
basic type?
I suggest you to remove it and add "fetch=FetchType.EAGER" to the
@OneToOne annotation, to retrieve the employee and the contact in the
same time.
Personally, I try to avoid bidirectionnal one to one relation.
Hope it helps.
JM
On 17 oct, 21:35, kidowell <crui...@gmail.com> wrote:
> Dear All. I need a help here. I may be misunderstanding something.
>
> I have 2 classes Employee and ContactInfo. in a bidirectional OneToOne
> relation. Being Employee the owner side.
>
> When retrieving an employee the attribute contactInfo is okay, but when I
> retreive a particular contactInfo. The attribute employee is null.
>
> Here are the classes:
>
> @Entity
> @Table(name = "employee")
> public class Employee implements Serializable {
>
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Long id;
> @Basic
> private String firstName;
> @Basic
> @OneToOne(cascade = CascadeType.ALL)
> private ContactInfo contactInfo;
>
> public Employee() {
> super();
> this.contactInfo = new ContactInfo();
> }
>
> //getters and setters...
>
> @Entity
> @Table(name = "contact_info")
> public class ContactInfo implements Serializable {
>
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Key key;
>
> private String mobNumber;
> @Basic
> @OneToOne(mappedBy = "contactInfo")
> private Employee employee;
>
> public ContactInfo() {
> super();
>
> }
>
> //getters and setters
>
> //Method to retreive contactInfo By Mobile Number
>
> public ContactInfo loadContactInfoByMobNumber(String mobNumber)
> throws NullParameterException, GeneralException {
> entityManager = EMF.get().createEntityManager();
> List<ContactInfo> list;
> ArrayList<ContactInfo> contactInfos;
> if (mobNumber == null) {
> throw new NullParameterException(
> "Parameter aniId cant be null in method
> loadAnnotationById");
> }
> try {
> String sql = "SELECT ci FROM ContactInfo ci WHERE
> ci.mobNumber='"
> + mobNumber + "'";
> list = entityManager.createQuery(sql).getResultList();
> contactInfos = new ArrayList<ContactInfo>(list);
> } catch (Exception e) {
> throw new GeneralException(
> "Exception in method loadAnnotationById: " +
> e.getMessage());
> } finally {
> if (entityManager.isOpen()) {
> entityManager.close();
> }
> }
>
> return contactInfos.get(0); --------------------------> this
> object has an attribute employee in null :('.
> }
>
> Thenk you very much in advance.
>
> Regards.
>
> --
> Kido.
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