https://issues.apache.org/bugzilla/show_bug.cgi?id=48971
Summary: memory leak protection : stopping TimeThreads should
be optional and disabled by default
Product: Tomcat 6
Version: 6.0.24
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
While investigating to write this wiki page
http://wiki.apache.org/tomcat/MemoryLeakProtection , I realized that
WebAppClassLoader.clearReferencesStopTimerThread() can have dangerous side
effects.
Indeed, if the TimerThread was spawned by some library deployed in the common
(or even JRE) classpath, then stopping it can impact other webapps still
running.
It would probably be a bug of that library to have such a thread with such a
context classloader, but we have to be realistic, we cannot fix every
third-party library (and the JRE).
In my opinion, tomcat should better play it safe in such a case, and should not
attempt by default to stop TimerThreads : it's safer to have a leak for a
stopped webapp than break running apps !
WebAppClassLoader.clearReferencesStopTimerThread() should be conditioned with
the existing boolean clearReferencesStopThreads.
see attached proposed patch.
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