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

[Max Rydahl Andersen (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_29342 ] 

Max Rydahl Andersen commented on HHH-3069:
------------------------------------------

you use load to create a Person proxy then use get to load an Employee (same class hiearchy) with the same id - something is clearly not consistent in the session state hence an exception is the only way to avoid hiding this possible data consistency bug in your apps data. 
If we did not throw an exception how should hibernate otherwise let you know that the Person proxy you got is invalid ? 

In short don't use .load if you are not sure the id exists.



> 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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