Derby can leak classloaders in an app server environment
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Key: DERBY-3745
URL: https://issues.apache.org/jira/browse/DERBY-3745
Project: Derby
Issue Type: Bug
Components: Services
Affects Versions: 10.4.1.3, 10.3.3.0, 10.5.0.0
Reporter: 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/[EMAIL PROTECTED]
[truncating at running thread LEAK]
Object: 0x42278e58 java/lang/[EMAIL PROTECTED]
Children:
0x42278ee0 java/lang/[EMAIL PROTECTED]
0x4226e558 java/lang/[EMAIL PROTECTED]
0x42278e40
org/apache/derby/impl/services/monitor/[EMAIL PROTECTED]
0x419cfac0
The second is another long running thread. The same applies:
0x426fe7a0 java/lang/[EMAIL PROTECTED]
[truncating at running thread LEAK]
Object: 0x426fe7a0 java/lang/[EMAIL PROTECTED]
Parents:
0x4226e5a8 [Ljava/lang/Thread;@6f386f38
0x426fe548
org/apache/derby/iapi/services/context/[EMAIL PROTECTED]
Children:
0x426fe838 java/lang/[EMAIL PROTECTED]
0x4226e558 java/lang/[EMAIL PROTECTED]
0x426fe4f8
org/apache/derby/impl/services/daemon/[EMAIL PROTECTED]
0x419cfac0
The third is a TimerThread owneed , which is created when a
Timer is created. The same applies:
0x425ac538 java/util/[EMAIL PROTECTED]
[truncating at running thread LEAK]
Object: 0x425ac538 java/util/[EMAIL PROTECTED]
Parents:
0x41faaf58 [Ljava/lang/Thread;@3c583c58
Object: 0x425ac510 java/util/[EMAIL PROTECTED]
Parents:
0x425ac500
org/apache/derby/impl/services/timer/[EMAIL PROTECTED]
6e2
For more info, see thread at:
http://www.nabble.com/ClassLoader-leaks--td18121374.html
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