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
