LAZY 1:1 (self-) reference with Inheritance ---> WRONG INTERFACES implemented by Javassist/CGLIB created Proxies ---------------------------------------------------------------------------------------------------------------- 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!! -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira