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. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.