[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3069) ObjectNotFoundException when proxy exists for super class of non existant joined subclass

[dan oxlade (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_29345 ] 

dan oxlade commented on HHH-3069:
---------------------------------

So hibernate does not allow you to use a lazy fetching strategy with any object graph which contains a many-to-one mapping where the one side may not exist? Basically this is not supported.

> ObjectNotFoundException when proxy exists for super class of non existant joined subclass
> -----------------------------------------------------------------------------------------
>
>                 Key: HHH-3069
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3069
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.5
>            Reporter: dan oxlade
>
> A proxy of an entity which has a joined subclass is loaded into the session.
> If the proxy resolves to null, i.e the id of the proxy has no matching row in the database then future queries (in the same hibernate session) for any of the joined subclass entities will fail with ObjectNotFoundExceptions from the returnNarrowedProxy method of the DefaultLoadEventListener.
> the following test method in JoinedSubclassTest demonstrates the failing test:
> 	
> 	public void testProxyLoadedWhichDoesNotExist() throws Exception {
> 		Session s = openSession();
> 		Transaction t = s.beginTransaction();
> 		
> 		Long id = Long.valueOf(0L);
> 		Employee employee = (Employee) s.get(Employee.class,id);
> 		assertNull(employee);
> 		
> 		Person proxy = (Person) s.load(Person.class,id);
> 		assertNotNull(proxy);
> 		
> 		employee = (Employee) s.get(Employee.class,id);
> 		assertNull(employee);
> 		
> 		t.commit();
> 		s.close();
> 	}

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