[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3217) Merge does a useless refresh of a non-cascaded OneToMany List before de-initializing that List (testcase PATCH)

[Geoffrey De Smet (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_29948 ] 

Geoffrey De Smet commented on HHH-3217:
---------------------------------------

Actually, I did, but it's meant for the hibernate-entitymanager trunk, as this issue was originally created under entitymanager.
Can merge even be used under hibernate classic? And if so - how?
I don't understand why it's been moved though there's probably good reason :)

> Merge does a useless refresh of a non-cascaded OneToMany List before de-initializing that List (testcase PATCH)
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-3217
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3217
>             Project: Hibernate3
>          Issue Type: Improvement
>    Affects Versions: 3.2.6
>            Reporter: Geoffrey De Smet
>         Attachments: EJB-347.patch
>
>
> Testcase patch attached.
> When merging a detached Author which had it's songs fetched (but there is no cascading to those songs),
> hibernate first does a useless check if all those songs still exist (but doesn't check their optimistic lock),
> and then returns the Author with a not intialized songs list.
> That check is very inconsistent:
> - if a song has been updated, it works, except that it shows an n +1 query problem (wihen not using BatchSize)
> - if a song has been deleted, it crashes, even though the merge isn't cascaded. It doesn't give an OptmisticLockingException, but this exception:
> javax.persistence.EntityNotFoundException: Unable to find org.hibernate.ejb.test.cascade.Song with id 51
> If this behaviour is mandated by the JPA spec, an annotation, much like @OptimisticLock(excluded = true), to turn off this unwanted behaviour, would be wonderfull :)

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