[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3019) LAZY 1:1 (self-) reference with Inheritance ---> WRONG INTERFACES implemented by Javassist/CGLIB created Proxies

[S.Schnabl (JIRA)]

LAZY 1:1 (self-) reference with Inheritance ---> WRONG INTERFACES implemented by Javassist/CGLIB created Proxies
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                 Key: HHH-3019
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3019
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.5, 3.2.4.sp1, 3.2.4
         Environment: Win-XP, Jboss 4.2.2.GA, Java 1.6, Hibernate 3.2.4Sp1
            Reporter: S.Schnabl
            Priority: Blocker
         Attachments: Hibernate_lazy_1-to-1_with-proxy_TestCase.rar

Hello, following simple testcase:

EntityC, EntityB, EntityA are interfaces and have their respective implementations EntityCImpl, EntityBImpl, EntityAImpl.  Inheritance structure is following:

-> EntityC extends EntityB extends EntityA.

Now EntityA  has a 1:1 reference for another Entity, which at least must implement Interface 'EntityA' itself.  These relation is described like following:

	@OneToOne(fetch = FetchType.LAZY, targetEntity = EntityAImpl.class)
	public EntityA getNextEntity() {
		return this.nextEntity;
	}



Testcase: ( for complete testcase and entity structure see attached zip-file. Sorry, but only a jboss-variante attached due to short of time. Simply deploy the server.ear file from release-directory and run the src/client/TestCaseClient.java)

Mainly the testcase does the following:

		// create a entityA
		EntityA a = new EntityAImpl();
		this.em.persist(a);

		// create a EntityB, which inherits from EntityA
		EntityB b = new EntityBImpl();
		this.em.persist(b);

		// link B to A
		a.setNextEntity(b);

        	// load EntityA, which has an 1:1 attached EntityB(-Proxy!)
		EntityA a = this.em.find(EntityAImpl.class, idEntityA);

		// load attached EntityB - should be from expected type EntityB(-Proxy!)
		Object b = a.getNextEntity();

		// Now check, which Interfaces these EntityB implements: should be
		// EntityA and EntityB, but NOT EntityC
		if (b instanceof HibernateProxy)
			System.out.println("Loaded object is instanceof " + HibernateProxy.class.getSimpleName()); // true
		if (b instanceof EntityB)
			System.out.println("Loaded object is instanceof " + EntityBImpl.class.getSimpleName()); // true
		if (b instanceof EntityC)
			System.out.println("Loaded object is instanceof " + EntityCImpl.class.getSimpleName()); // TRUE - ERROR !!!!!!!!  That's a bug ! We loaded an EntityB which CANNOT be of Type EntityC !!!!


As you can see, the proxy implents wrongly the Interface EntityC, which must NOT implemented, cause we have only an EntityB linked to EntityA!!






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