[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4547) IdGenerator + CompositeId = HibernateException: identifier of an instance of _ was altered

[David M. Lee (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34462#action_34462 ] 

David M. Lee commented on HHH-4547:
-----------------------------------

And if you're really interested, I've posted the code to github.
http://github.com/leedm777/composite-key-bug
git://github.com/leedm777/composite-key-bug.git

> IdGenerator + CompositeId = HibernateException: identifier of an instance of _ was altered
> ------------------------------------------------------------------------------------------
>
>                 Key: HHH-4547
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4547
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.3.2
>         Environment: Hibernate 3.3.2, seen on HSQLDB and PostgreSQL
>            Reporter: David M. Lee
>            Priority: Minor
>         Attachments: composite-key-bug.tar.gz
>
>
> I have some legacy code that I'm working with that uses composite-id for some entities, and has an IdGenerator for the id's.
> The generator generates the id's correctly, but they do not get set on the entities when they are saved.  For the base class, this results in the following exception:
> org.hibernate.HibernateException: identifier of an instance of org.hibernate.example.compositeid.EntityWithCompositeId was altered from CompositeId{id1=1, id2=1} to CompositeId{id1=null, id2=null}
> 	at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:81)
> 	at org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:187)
> 	at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:143)
> 	at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
> 	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
> 	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)
> 	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
> Strangely, on subclasses we do not get this exception.  I've attached an example, which has a couple of unit tests that demonstrate the problem.

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