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From "Peter Rademaker (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1718) multiple @OneToMany relations with entities with common super type using InheritanceType.JOINED are incorrectly fetched
Date Wed, 07 Jul 2010 15:01:50 GMT
multiple @OneToMany relations with entities with common super type using InheritanceType.JOINED
are incorrectly fetched
-----------------------------------------------------------------------------------------------------------------------

                 Key: OPENJPA-1718
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1718
             Project: OpenJPA
          Issue Type: Bug
    Affects Versions: 2.0.0
            Reporter: Peter Rademaker


I have an entity "Event" which has two @OneToMany relations with two entities "Appointment"
and "Activity" which both have the same superclass "Booking".

After saving an Event with 1 Activity and 1 Appointment and retrieving it using find, the
Event is returned with 2 (!) Activities and  1 Appointment.  One of these Activities seems
to contain the data of the Appointment.

I noticed that two things both seem to make it work as excepted: 
   (1) change the @Inheritance strategy to one of InheritanceType.SINGLE_TABLE or InheritanceType.TABLE_PER_CLASS
   (2) remove the @Version field from "Event"



These are the entity configurations:  

@Entity
public final class Event  {
	@Id
	@GeneratedValue
	protected Long id;
	@Version
	protected Integer version;

	@OneToMany(cascade = ALL, mappedBy = "event", fetch = FetchType.EAGER)
	private List<Activity> activities = new ArrayList<Activity>();

	@OneToMany(cascade = ALL, mappedBy = "event", fetch = FetchType.EAGER)
	private List<Appointment> appointments = new ArrayList<Appointment>();
     ...
}

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Booking {
	@Id
	@GeneratedValue
	protected Long id;

	@ManyToOne(optional = true, cascade = ALL, fetch = FetchType.EAGER)
	protected Event event;
	
	@Basic(fetch = FetchType.EAGER)
	public String name;
        ...
}

@Entity
public final class Activity extends Booking {
  ...
}

@Entity
public final class Appointment extends Booking {
  ...
}


This is the "test" which illustrates the problem:


public static void main(String[] args) {
		Event event = new Event();
		
		Appointment appointment = new Appointment("APPOINTMENT");
		appointment.setEvent(event);
		event.addAppointment(appointment);
		Activity activity = new Activity("ACTIVITY");
		activity.setEvent(event);
		event.addActivity(activity);
		
		System.out.println("#activities before saving: " + event.getActivities().size());
		System.out.println("#appointments before saving: " +  event.getAppointments().size());
		
		Event saved = save(event);
		System.out.println("#activities after saving: " + saved.getActivities().size());
		System.out.println("#appointments after saving: " + saved.getAppointments().size());
		
		Event found =  find(saved.getId());
		System.out.println("#activities after find: " + found.getActivities().size());
		System.out.println("#appointments after find: " + found.getAppointments().size());
	}
	
	private static Event save(Event entity) {
		entityManager.getTransaction().begin();
		Event result = entityManager.merge(entity);
		entityManager.getTransaction().commit();
		return result;
	}
	
	private static Event find(long id) {
		entityManager.getTransaction().begin();
		Event result = entityManager.find(Event.class, id);
		entityManager.getTransaction().commit();
		return result;
	}
	
	static OpenJPAEntityManager entityManager = (OpenJPAEntityManager) Persistence.createEntityManagerFactory(
			"openjpa_test", System.getProperties()).createEntityManager();



I've attached all the files a zip.



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