3 Replies Latest reply on Jan 3, 2006 5:02 AM by sunnyyfl

    JBoss EJB3 RC2 - Statefull session bean with extended entity

    David Smid Newbie

      I realized that statefull session bean with extended entity manager is not able passivate.

      Take a look at this example:

      public @Stateful class EBProxySB<T extends EB> implements EBProxy<T>, Serializable
      {
       private static final long serialVersionUID = 1169653273427828251L;
      
       @PersistenceContext(type=PersistenceContextType.EXTENDED)
       protected EntityManager manager;
      
       protected boolean bound = false;
      
       private T entity;
      
       public T getEntity()
       {
       return entity;
       }
      
       public void setEntity(T ent)
       {
       entity = ent;
       }
      
       public boolean isBound()
       {
       return bound;
       }
      ...
      }
      
      


      If this session bean is not removed whithin 5 minutes after creation, JBoss tries to passivate it but the passivation process fails with an exception "Not serializable".
      I tried to find out where is the problem and realized that extented persistence manager has an aggregated member of class TransactionImpl which is NOT serializable. I took a look in the source and found out that persistence context is only serialized when the entity manager is not transient:

       public void writeExternal(ObjectOutput out) throws IOException
       {
       out.writeBoolean(isTransient);
       out.writeObject(initialContextProperties);
       if (!isTransient)
       {
       out.writeObject(persistenceContext);
       }
       }
      


      After annotating entity manager as @Transient, the session bean was able to passivate but then the activation process failed with an exception (with description "Entity manager factory is not bound").

      The only workaround I can see is to increase the passivation timeout which is not very handy.

      Has anybody a solution for this problem ?