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Posted to derby-dev@db.apache.org by "Kathey Marsden (JIRA)" <ji...@apache.org> on 2008/07/01 01:56:45 UTC
[jira] Commented: (DERBY-3745) Derby can leak classloaders in an
app server environment
[ https://issues.apache.org/jira/browse/DERBY-3745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609408#action_12609408 ]
Kathey Marsden commented on DERBY-3745:
---------------------------------------
One problem with setting the contextClasssLoader for the new threads is that we don't document that setContextClassLoader permission is required for derby.jar, so trying it I get java.security.AccessControlException: access denied (java.lang.RuntimePermission setContextClassLoader) using the default testing policy file.
> 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
>
> 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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