Hi!

Many of my entities have an id of type long. So I put the code (getters, setters ...) into an superclass. After I did it, the id wasn't initialized by hibernate any more, if I persisted an entity. Thats very strange.

Here is the code:

public class GenerateValueTestcase extends TestCase {

 @MappedSuperclass
 public static abstract class EntityWithIntId {

 private long id = -1;

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 public long getId() {
 return id;
 }

 public void setId(long id) {
 this.id = id;
 }
 }

 @Entity
 public static class TestEntity extends EntityWithIntId implements Serializable {

 private static final long serialVersionUID = 1L;

 }

 public void testGeneratedIds() {

 TestStarterRemote bean = UsefullFunctions.getTestStarterRemote();

 Set<Long> ids = new HashSet<Long>();

 final int NO_ENTITIES = 10;

 for (int i = 0; i < NO_ENTITIES; i++) {
 EntityWithIntId entity = new TestEntity();
 entity = bean.merge(entity);
 ids.add(entity.getId());
 }

 assertEquals("Each entity must have an unique id", NO_ENTITIES, ids
 .size());

 }

}

The bean.merge method:

 public <T> T merge(T o) {
 return entityManager.merge(o);
 }

Any ideas or workarounds? Copying the code into each class is not the best idea I think....

Thanks for your help
Meinert