[jboss-user] [EJB 3.0] - ClassCastException within an EAR deployment

[heizenberg]

DVS3.ear/
  |  +-Util.jar (J2EE utility project)
  |  | +-dvs3.Changelist (java interface)
  |  |
  |  +-Core.jar/ (EJB Project)
  |  | +dvs3.code.session.ChangelistService (java interface that extends dvs3.Changelist)
  |  | +dvs3.code.session.ChangelistServiceBean (stlss sess bean that implements ChangelistService)
  |  | 
  |  +-WebUI.war/
  |  | +dvs3.code.action.JSFBackingBean (a bbean that calls a session bean service via JNDI)
  | 
I'm assuming the manifest files are defined correctly since both Core.jar and Util.jar are referenced in the WebUI.war manifest file and Util.jar is referenced in the Core.jar manifest file.

In the backing bean, I have this piece of code:

    String jndi = "DVS3EAR/ChangelistServiceBean/local";
  |     Object service = new InitialContext().lookup(jndi);
  |     System.out.println(service instanceof ChangelistService) // prints true
  |     System.out.println(service instanceof Changelist)        // prints false
  |     Changelist service = (Changelist) obj;                   // fails with a ClassCastException
  | 
Why is this?

At some level, isn't this violating a fundamental java principle? Since ChangelistService is a Changelist, why can't I cast the service object to be a Changelist, but can cast it to be of type ChangelistService?

Is this some kind of weird (but legal) classloading?

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