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https://issues.apache.org/jira/browse/JCR-1334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568575#action_12568575
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Marcel Reutegger commented on JCR-1334:
---------------------------------------

> when will the downgrade be called ?

downgrade is called in SharedItemStateManager.Update.end()

> because the deadlock comes from the searchmanager. he calls 
> DefaultISMLocking.acquireReadLock and this
> call comes from a different thread than from downgrade.

no, I don't think so. the stacktrace includes the Update.end() call and at the 
time EventStateCollection.dispatch() is called the lock is downgraded and 
associated with the current thread that later calls acquireReadLock().

> Deadlock with XA enabled
> ------------------------
>
>                 Key: JCR-1334
>                 URL: https://issues.apache.org/jira/browse/JCR-1334
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-core, jackrabbit-jca
>    Affects Versions: 1.4
>         Environment: WebSphere Application Server 5.1
>            Reporter: Claus Köll
>            Priority: Critical
>         Attachments: javacore.20080121.132210.2524.txt, lock_output.txt, 
> PatchedDefaultISMLocking.java, PatchedDefaultISMLocking_2.java, Stacktrace.txt
>
>
> Since we have configured a j2c resource adapter any modification to the 
> repository ends
> with a deadlock.

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