[Hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1954) Proxies are never unassociated (evicted) from a session

[Maarten W. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1954?page=all ]

Maarten Winkels updated HHH-1954:
---------------------------------

    Attachment: proxy-evict.patch

This one-line fix sets the session of a proxy to NULL when evicting. This solves the problem and all other tests run fine.

> Proxies are never unassociated (evicted) from a session
> -------------------------------------------------------
>
>          Key: HHH-1954
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1954
>      Project: Hibernate3
>         Type: Bug

>     Versions: 3.2.0.cr3
>     Reporter: Maarten Winkels
>  Attachments: Person.hbm.xml, Person.java, ProxyEvictTest.java, proxy-evict.patch
>
>
> When evicting (either directly or by cascade) a proxy from a session, the proxy is removed from an internal map (proxiesByKey), but the proxy's lazy initializer still has reference to the session. This allows for lazy initialization of a proxy even after the proxy is evicted. This seems semantically incorrect: The documentation of LazyInitializer.getSession() reads: "Get the session, if this proxy is attached" an proxy evicted from a session should cleary not remain attached to the session.
> The current implementation leads to concurrent modification exceptions, when one thread detaches entities from one session and another attaches these entities to another. The method AbstractLazyInitializer.isConnectedToSession() is called when locking a proxy to a session. This will search the old session for the proxy (in the containsProxy() call). When another thread is manipulating this sessions proxy ByLey map, a concurrent modification exception will occure.
> Note that each session is used in a thread-safe context by the application! When reassociating a proxy to the new session, hibernate breaks the thread-safety by querying the other session.

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