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Date: Tue, 19 Apr 2011 01:56:06 -0700 (PDT)
From: QkI <kukismen@gmail.com>
To: users@openjpa.apache.org
Message-ID: <1303203366152-6286468.post@n2.nabble.com>
Subject: Problem with fetching relation
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Hi,

I've got a problem during fetching @ManyToOne relations.
Consider following persistent classes:

@Entity
@Table(name =3D "x")
@Inheritance(strategy =3D InheritanceType.JOINED)
@DiscriminatorColumn(name =3D "jdoclass", length =3D 255)
@DiscriminatorStrategy("org.apache.openjpa.jdbc.meta.strats.ClassNameDiscri=
minatorStrategy")
public class X {
  @Id
  @Column(name =3D "id")
  private int id;
}

@Entity
@Table(name =3D "b")
public class B extends X {

  @Column(name =3D "name")
  private String name;
}

@Entity
@Table(name =3D "a")
public class A extends X {

  @ManyToOne
  @JoinColumn(name =3D "b_id")
  private B b;
}


The following test fails always.

@Test
  public void test2() {
    EntityManager em =3D context.getEm();
    List<X> results =3D em.createQuery("SELECT e FROM X e").getResultList()=
;
    assertTrue(results.size() =3D=3D 2);
    for(X x : results) {
      if(x instanceof A) {
        A a =3D (A) x;
        assertNotNull(a.getB());
      }
    }
    em.close();
  }

@Before
  public void init() {
    context.init();
    EntityManager em =3D context.getEm();
    EntityTransaction et =3D em.getTransaction();
    try {
      et.begin();

      B b =3D new B();
      b.setId(101);
      b.setName("test");

      A a2 =3D new A();
      a2.setB(b);
      a2.setId(102);
      a2.setNo(2);

      //em.persist(a);
      em.persist(b);
      em.persist(a2);
      et.commit();
    } catch (Throwable t) {
      et.rollback();
    }
  }

Does anybody know what might be a reason of this ?

PS.
When I replaced @ManyToOne relation by primitive field:

@Column(name=3D"b_id")
private int bId;

everything works, but I'm not a big fun of such workaround.

Regards,
Pawe=C5=82


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