[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - @GeneratedValue in mappedSuperclass problem

[hoeft]

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

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