[jboss-jira] [JBoss JIRA] Created: (EJBTHREE-1189) ClassCastException within EAR - Stateless Session Bean interface flattening hierarchy

[Ananda Debnath (JIRA)]

ClassCastException within EAR - Stateless Session Bean interface flattening hierarchy
-------------------------------------------------------------------------------------

                 Key: EJBTHREE-1189
                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-1189
             Project: EJB 3.0
          Issue Type: Bug
    Affects Versions: AS 4.2.0 GA
         Environment: Win XP Prof, Java 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03), Java HotSpot Client VM (build 1.5.0_14-b03, mixed mode, sharing)
            Reporter: Ananda Debnath


Project structure
=============
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 (stateless session 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?

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