https://issues.apache.org/bugzilla/show_bug.cgi?id=52850
Bug #: 52850
Summary: Various miscellaneous fixes to Tomcat Memory Leak
Detection code
Product: Tomcat 7
Version: trunk
Platform: PC
OS/Version: Windows Server 2003
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Problem Description -
----------------------
Tomcat memory leak detection has the following issues
- Most of the detection and fixing code has been tested ONLY on Sun JVMs. A lot
of the reflection based code does not work with the IBM JDK.
- Tests in tomcat7.source\test\org\apache\catalina\loader do not seem to run
successfully and are incomplete for all the protection that Tomcat provides for
classloader memory leaks.
- For some categories of threadlocal memory leaks the key and value are not
displayed correctly in the warning messages; particularly ones dealing with
indirect references to threadlocals
- org.apache.catalina.loader.WebappClassLoader.loadedByThisOrChild(Object)
incorrectly traverses the object classloader hierarchy instead of the current
(this) classloader hierarchy
Problem Conclusion -
--------------------
- After extensive testing with the IBM JDKs, I have cleaned up and sanitized
some of the reflection code to stop executors, timers, threads etc on the IBM
JDK
- Added new tests for detecting threadlocal leaks and thread leaks
- Better ThreadLocal leak reporting with corrected loadedByThisOrChild method
and addition of expungeStaleEntries method
- Make code more resilient in certain leak detection scenarios.
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