Hibernate Issues

I have been playing with Hibernate recently, and found more problems 
than I expected!

Given
@Entity
public class Event {
     @Id @GeneratedValue
      Long id;
      @Column
      String title;
      @OneToMany(mappedBy="event", fetch=FetchType.LAZY) // Lazy 
reccommened pp JPWH p570
      Set<Activity> activities = new HashSet();
      public Event getThis() {return this;}
}

and

@Entity
public class Activity {
     @Id @GeneratedValue
     long id;
     @ManyToOne(fetch=FetchType.LAZY)
     Event event;
     @Column
     String name;
}

Then
      Event event2bPre = (Event)session.get(Event.class, 2L);
      Activity act4bPre = (Activity)session.get(Activity.class, 4L);
      assertEqual("Second Event", act4bPre.event.title);
Works.

But
      Activity act4b = (Activity)session.get(Activity.class, 4L);
      assertTrue(act4b.event.getClass().getName().contains("Event$$EnhancerByCGLIB")); 
// Ahh!
      Event event2aPost = (Event)session.get(Event.class, 2L);
      assertTrue(null == act4b.event.title);
Does not work -- act4b.event.title should not be null.

I think that the weird proxy class is to blame.  I have sometimes 
even got Entity.getThis() != this(!).

The definitions for the classes are as recommended by the book, 
AFAIK.  I suspect that the annotations are not properly 
supported/documented, and have weird JPA issues, and so I would 
probably be better off sticking to XML.  (Have not tried.)

But I have spent several hours on this trivial example.

Needless complexity is evil.

Anthony



Dr Anthony Berglas, [email protected]       Mobile: +61 4 4838 8874
Just because it is possible to push twigs along the ground with ones nose
does not necessarily mean that is the best way to collect firewood.


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