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https://issues.apache.org/jira/browse/JCR-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12578334#action_12578334
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Felix Meschberger commented on JCR-1454:
----------------------------------------

Backported to 1.4 branch for release in Rev. 636782.

> NullPointerException may be thrown when trying to enumerate observation event 
> listeners
> ---------------------------------------------------------------------------------------
>
>                 Key: JCR-1454
>                 URL: https://issues.apache.org/jira/browse/JCR-1454
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-jcr-rmi
>    Affects Versions: 1.4
>            Reporter: Felix Meschberger
>            Assignee: Felix Meschberger
>             Fix For: rmi 1.4.1, 1.5
>
>
> When calling the ObservationManager.getRegisteredEventListeners() a 
> NullPointerException may be thrown if no event listener has been registered 
> (yet). The reason for this is, that in the 
> ClientObservationManager.getRegisteredEventListener method an internal field 
> is access directly, which is created on demand and thus may be null.

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