[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1460) Inconsistent behavior when using Session.get() with multiple subclasses
Olaf Lenzmann (JIRA)
noreply at atlassian.com
Mon Nov 13 16:04:05 EST 2006
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1460?page=comments#action_25263 ]
Olaf Lenzmann commented on HHH-1460:
------------------------------------
Wonderful - thanks a lot for the quick fix!
> Inconsistent behavior when using Session.get() with multiple subclasses
> -----------------------------------------------------------------------
>
> Key: HHH-1460
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1460
> Project: Hibernate3
> Type: Bug
> Components: core
> Versions: 3.1.2
> Environment: Hibernate 3.1.2
> HSQLDB 1.8.0.2
> Java 1.5.0_05-b05
> Reporter: Seth Fitzsimmons
> Assignee: Steve Ebersole
> Fix For: 3.2.1
> Attachments: ClassCastException.zip
>
>
> Session.get() loads a cached instance of an alternate subclass with the same PK after that subclass has been loaded directly (throwing a ClassCastException where null was expected). When attempting to load it without prior loading, null is returned, as expected.
> Client and Partner both extend person and have discriminator values of 1 and 2, respectively. There is a single entry in the database (a Client) with a PK of 0.
> This should be null:
> Partner partner = (Partner) getSession().get(Partner.class, 0);
> assertNull(partner);
> It is. However, if the Client is loaded first, Hibernate will attempt to return a Partner (as a Client) where it should not exist:
> Client client = (Client) getSession().get(Client.class, 0);
> assertNotNull(client);
>
> // this should be null, not return a Client object (resulting in a ClassCastException)
> Partner partner = (Partner) getSession().get(Partner.class, 0);
> assertNull(partner);
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