[Hibernate-issues] [Hibernate-JIRA] Created: (HB-218) Interface as class type for <many-to-one/> property

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  A new issue has been created in JIRA.

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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-218


Here is an overview of the issue:
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        Key: HB-218
    Summary: Interface as class type for <many-to-one/> property
       Type: New Feature

     Status: Unassigned
   Priority: Major

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.0 final

   Assignee: 
   Reporter: Chris Hane

    Created: Mon, 28 Jul 2003 2:21 PM
    Updated: Mon, 28 Jul 2003 2:21 PM
Environment: java 1.3.1_04

Description:

Is it legal to map a many-to-one class to an interface. I have done this with
the father property (in the attached example), however, I am receiving errors when I try to load records where
the parent property is not null.

I have attached a set of files that demonstrate the error I am getting.  To use:
1. run the sql script to build files and populate data
   Note: I'm using MySQL so you might have to change for a different DB
2. Change eg.test configuration properites to reflect your DB setup
3. Run eg.test
   Everything should work fine and "Detail B1 - F3" should be printed
   to the output
4. Now in eg.test, change the configuration to use eg.IFather instead of eg.Father
5. In IDetail, change the m-1 father property from eg.Father to eg.IFather
6. Re-run and you will get this error.

Exception in thread "main" java.lang.IllegalArgumentException: No visible constructors in interface eg.IFather
        at net.sf.cglib.EnhancerGenerator.<init>(EnhancerGenerator.java:128)
        at net.sf.cglib.Enhancer.enhanceClassHelper(Enhancer.java:224)
        at net.sf.cglib.Enhancer.enhanceHelper(Enhancer.java:206)
        at net.sf.cglib.Enhancer.enhance(Enhancer.java:162)
        at net.sf.cglib.Enhancer.enhance(Enhancer.java:139)
        at net.sf.hibernate.proxy.CGLIBLazyInitializer.getProxy(CGLIBLazyInitializer.java:26)
        at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1790)
        at net.sf.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1728)
        at net.sf.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:62)
        at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:1971)
        at net.sf.hibernate.loader.Loader.doFind(Loader.java:196)
        at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:587)
        at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:42)
        at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:392)
        at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:1901)
        at net.sf.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1710)
        at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:48)
        at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:55)
        at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:153)
        at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:49)
        at eg.DetailB$$EnhancedByCGLIB$$0.getTestValue(<generated>)
        at com.test.main(test.java:39)
rethrown as net.sf.hibernate.HibernateException: CGLIB Enhancement failed: No visible constructors in interface eg.IFather
        at net.sf.hibernate.proxy.CGLIBLazyInitializer.getProxy(CGLIBLazyInitializer.java:37)
        at net.sf.hibernate.impl.SessionImpl.doLoadByClass(SessionImpl.java:1790)
        at net.sf.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:1728)
        at net.sf.hibernate.type.ManyToOneType.resolveIdentifier(ManyToOneType.java:62)
        at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:1971)
        at net.sf.hibernate.loader.Loader.doFind(Loader.java:196)
        at net.sf.hibernate.loader.Loader.loadEntity(Loader.java:587)
        at net.sf.hibernate.loader.EntityLoader.load(EntityLoader.java:42)
        at net.sf.hibernate.persister.EntityPersister.load(EntityPersister.java:392)
        at net.sf.hibernate.impl.SessionImpl.doLoad(SessionImpl.java:1901)
        at net.sf.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:1710)
        at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:48)
        at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:55)
        at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:153)
        at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:49)
        at eg.DetailB$$EnhancedByCGLIB$$0.getTestValue(<generated>)
        at com.test.main(test.java:39)
rethrown as net.sf.hibernate.LazyInitializationException: Hibernate lazy instantiation problem: CGLIB Enhancement failed: No visible constructors in interface eg.IFather
        at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:59)
        at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:153)
        at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:49)
        at eg.DetailB$$EnhancedByCGLIB$$0.getTestValue(<generated>)
        at eq.test.main(test.java:43)

Chris....


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