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From Apache Wiki <wikidi...@apache.org>
Subject [Tomcat Wiki] Update of "MemoryLeakProtection" by SylvainLaurent
Date Sun, 28 Mar 2010 21:28:11 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Tomcat Wiki" for change notification.

The "MemoryLeakProtection" page has been changed by SylvainLaurent.
http://wiki.apache.org/tomcat/MemoryLeakProtection?action=diff&rev1=9&rev2=10

--------------------------------------------------

  ||[[#webappClassInstanceAsThreadLocalValue|Webapp class instance as ThreadLocal value]]||>=6.0.24||>=6.0.24||
[[#48837|Detect child classloaders]], [[#48895|improve thread safety]] ||
  ||[[#webappClassInstanceAsThreadLocalIndirectValue|Webapp class instance indirectly held
through a ThreadLocal value]]||no||no||Renew threads in the worker pool||
  ||[[#threadLocalPseudoLeak|ThreadLocal pseudo-leak]]||>=6.0.24||>=6.0.24||[[#48895|improve
thread safety]]||
- ||[[#cclThreadSpawnedByWebApp|ContextClassLoader / Threads spawned by webapps]]||>=6.0.24||{{{TimerThread}}}
are stopped. Other threads may be stopped if {{{clearReferencesStopThreads}}} is set to true
on the Context ||[[#48837|Detect child classloaders]], don't stop {{{TimerThread}}} by default||
+ ||[[#cclThreadSpawnedByWebApp|ContextClassLoader / Threads spawned by webapps]]||>=6.0.24||{{{TimerThread}}}
are stopped. Other threads may be stopped if {{{clearReferencesStopThreads}}} is set to true
on the Context ||[[#48837|Detect child classloaders]], [[#48971|don't stop TimerThread by
default]]||
- ||[[#cclThreadSpawnedByCommonClassLoader|ContextClassLoader / Threads spawned by classes
loaded by the common classloader]]||>=6.0.24||{{{TimerThread}}} are stopped. Other threads
may be stopped if {{{clearReferencesStopThreads}}} is set to true on the Context ||[[#48837|Detect
child classloaders]], don't stop {{{TimerThread}}} by default||
+ ||[[#cclThreadSpawnedByCommonClassLoader|ContextClassLoader / Threads spawned by classes
loaded by the common classloader]]||>=6.0.24||{{{TimerThread}}} are stopped. Other threads
may be stopped if {{{clearReferencesStopThreads}}} is set to true on the Context ||[[#48837|Detect
child classloaders]], [[#48971|don't stop TimerThread by default]]||
  ||[[#cclThreadSpawnedByJRE|ContextClassLoader / Threads spawned by JRE classes]]|| no ||
>=6.0.24 pre-spawns some known offenders || ||
  ||[[#staticClassVariables|static class variables]]|| no ||> 6.0.? || ||
  ||[[#LogFactory|LogFactory]]||  ||> 6.0.? || ||
@@ -352, +352 @@

  SEVERE: A web application appears to have started a TimerThread named [Timer-0] via the
java.util.Timer API but has failed to stop it. To prevent a memory leak, the timer (and hence
the associated thread) has been forcibly cancelled. 
  }}}
  
- So the leak is fixed, but unfortunately there's a side effect : it broke webapp B eviction
timer.
+ So the leak is fixed, but unfortunately there's a side effect : [[#48971|it broke webapp
B eviction timer]].
- 
- (TODO: file a bug report to make the clearReferencesStopTimerThread optional and disabled
by default)
  
  Note: as of 6.0.24, by default tomcat stops threads of class {{{java.util.TimerThread}}}
whose context classloader is the {{{WebAppClassLoader}}} of the app being stopped. It does
not stop other threads, it only warns about them. It can try to stop them if the {{{clearReferencesStopThreads}}}
option of the standard context is set to true.
  
@@ -407, +405 @@

  Related issues
   * <<Anchor(48837)>>[[https://issues.apache.org/bugzilla/show_bug.cgi?id=48837|48837]]
- Memory leaks protection does not cure leaks triggered by JSP pages code
   * <<Anchor(48895)>>[[https://issues.apache.org/bugzilla/show_bug.cgi?id=48895|48895]]
- !WebAppClassLoader.clearThreadLocalMap() concurrency issues
-  * 
+  * <<Anchor(48971)>>[[https://issues.apache.org/bugzilla/show_bug.cgi?id=48971|48971]]
- memory leak protection : stopping !TimerThreads should be optional and disabled by default
  

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