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https://issues.apache.org/jira/browse/OPENJPA-1718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887722#action_12887722
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Peter Rademaker edited comment on OPENJPA-1718 at 7/13/10 8:02 AM:
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Could somebody please confirm that this is (or is not) a bug?
If so, we can start trying to fix it.
But we would like to be sure that this actually is a bug before we start such
an undertaking.
was (Author: prademak):
Could somebody please confirm that this is (or is not) a bug?
If so, we can start trying to fix it.
But we would like to be sure that this is a bug before we start such an
undertaking.
> Multiple @OneToMany relations with common supertype are incorrectly fetched
> when using InheritanceType.JOINED
> --------------------------------------------------------------------------------------------------------------
>
> 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
> Attachments: onetomany.zip
>
>
> 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 in a zip.
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