Correct Query For EJB

Question

I have such classes
Entity bean
@Entity(name = "Actor")
@Table(name = "actor")
public class Actor extends DomainObject{
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "actor_id_seq")
    @Column(columnDefinition = "id")
    private Long id;   
    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name="firstName", column=@Column(name = "firstname", nullable = false)),
        @AttributeOverride(name="lastName", column=@Column(name = "lastname", nullable = false))
    private PersonalInfo personalInfo;
   // getters and setters here
}Here is an embedded class
@Embeddable
public class PersonalInfo {
    private String firstName;
    private String lastName;
    //getters and setters
}And here is a stateless bean
@Stateless
@Remote(AccountService.class)
public class AccountServiceBean implements AccountService {
    @PersistenceContext
    private EntityManager manager;
    public Actor findActorByFirstName(String firstName){
        Query q = manager.createQuery("SELECT actor FROM Actor actor WHERE actor.firstName = :firstName"); //!!!HERE
        q.setParameter("firstName", firstName);       
        return (Actor) q.getSingleResult();
}Can anybody say, what is the reson why createQuery method doesn't work? Or maybe, somebody can help me with a correct query.
I use Sun Application Server 9. In log i see such error
javax.ejb.TransactionRolledbackLocalException: Exception thrown from bean; nested exception is: java.lang.NullPointerException
java.lang.NullPointerException
     at com.sun.enterprise.util.EntityManagerWrapper.createQuery(EntityManagerWrapper.java:521)
     at net.sourceforge.openejforum.services.engine.ejb3.AccountServiceBean.findActorByFirstName(AccountServiceBean.java:40)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
...Thank you
Message was edited by:
awep

Answer 1

You can try this in your query:
Query q = manager.createQuery("SELECT actor FROM Actor actor WHERE actor.personalInfo.firstName = :firstName");
        q.setParameter("firstName", firstName);    I hope this can help you.