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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3745) Derby can leak classloaders in an app server environment
Date Tue, 22 Jul 2008 21:31:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615797#action_12615797
] 

Kathey Marsden commented on DERBY-3745:
---------------------------------------

Since we are listing the permissions as optional,  I wonder if it makes sense to add them
to the default and template policy files after all, since these are geared more toward starting
network server from the command line where the leak probably wouldn't be an issue.


> 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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