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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3745) Derby can leak classloaders in an app server environment
Date Tue, 22 Jul 2008 17:23:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615685#action_12615685
] 

Daniel John Debrunner commented on DERBY-3745:
----------------------------------------------

> Doc update for new permissions requirement. I put it under mandatory. 

Why mandatory? The patch is not coded that the permission is mandatory, nor is it required
in all situations.

> Derby can leak classloaders in an app server environment
> --------------------------------------------------------
>
>                 Key: DERBY-3745
>                 URL: https://issues.apache.org/jira/browse/DERBY-3745
>             Project: Derby
>          Issue Type: Bug
>          Components: Services
>    Affects Versions: 10.3.3.0, 10.4.1.3, 10.5.0.0
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>         Attachments: cdevbabejgjd.html, derby-3745_10.3_diff.txt, derby-3745_10.3_diff2.txt,
derby-3745_doc_diff.txt, derby-3745_policy_files_diff.txt, derby-3745_trunk_diff.txt
>
>
> A user reported potential class loader leaks in Derby
> ...The first one looks like Derby created a long-running
> thread and copying the context class loader.  To fix, the
> context class loader should be saved/set/restored around the
> creation of the new thread so that it copies some benign class
> loader instead (e.g., null or getClass().getClassLoader()):
>  0x42278e58 java/lang/Thread@302e302e
>   [truncating at running thread LEAK]
> Object:  0x42278e58 java/lang/Thread@302e302e
> Children:
>  0x42278ee0 java/lang/String@303f303f
>  0x4226e558 java/lang/ThreadGroup@6f2e6f2e
>  0x42278e40
> org/apache/derby/impl/services/monitor/AntiGC@603a603a
>  0x419cfac0
> The second is another long running thread.  The same applies:
>  0x426fe7a0 java/lang/Thread@19901990
>   [truncating at running thread LEAK]
> Object:  0x426fe7a0 java/lang/Thread@19901990
> Parents:
>  0x4226e5a8 [Ljava/lang/Thread;@6f386f38
>  0x426fe548
> org/apache/derby/iapi/services/context/ContextManager@19421942
> Children:
>  0x426fe838 java/lang/String@19a319a3
>  0x4226e558 java/lang/ThreadGroup@6f2e6f2e
>  0x426fe4f8
> org/apache/derby/impl/services/daemon/BasicDaemon@19381938
>  0x419cfac0
> The third is a TimerThread owneed , which is created when a
> Timer is created.  The same applies:
>  0x425ac538 java/util/Timer$TimerImpl@6b8a6b8a
>   [truncating at running thread LEAK]
> Object:  0x425ac538 java/util/Timer$TimerImpl@6b8a6b8a
> Parents:
>  0x41faaf58 [Ljava/lang/Thread;@3c583c58
> Object:  0x425ac510 java/util/Timer@6b856b85
> Parents:
>  0x425ac500
> org/apache/derby/impl/services/timer/SingletonTimerFactory@56e25
> 6e2
> For more info, see thread at:
> http://www.nabble.com/ClassLoader-leaks--td18121374.html

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