Tomcat内存泄漏一览

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　　Tomcat在停止或者重新部署应用时可能存在内存泄漏。 以下面的地址中，尝试列出它们，并解释在什么情况下可以检测并修复泄漏。
　　http://wiki.apache.org/tomcat/MemoryLeakProtection

Leak cause	Detected by tomcat	Fixed by tomcat	Possible enhancements
Custom ThreadLocal class	>=6.0.24	>= 7.0.6
Webapp class instance as ThreadLocal value	>=6.0.24	>= 7.0.6
Webapp class instance indirectly held through a ThreadLocal value	no	>= 7.0.6
ThreadLocal pseudo-leak	>=6.0.24	>= 7.0.6
ContextClassLoader / Threads spawned by webapps	>=6.0.24	In 6.0.24-6.0.26 TimerThread are stopped but it may lead to problems. Optional from 6.0.27 with the clearReferencesStopTimerThreads flag. Other threads may be stopped with the clearReferencesStopThreads flag, but it's unsafe.	Fix the application to stop the thread when the application is stopped
ContextClassLoader / Threads spawned by classes loaded by the common classloader	>=6.0.24	In 6.0.24-6.0.26 TimerThread are stopped but it may lead to problems. Optional from 6.0.27 with the clearReferencesStopTimerThreads flag. Other threads may be stopped with the clearReferencesStopThreads flag, but it's unsafe.	Fix the offending code (set the correct CCL when spawning the thread)
ContextClassLoader / Threads spawned by JRE classes	no	>=6.0.24 pre-spawns some known offenders
static class variables	no	> 6.0.? . Disabled by default with tomcat 7
LogFactory		> 6.0.?
JDBC driver registration	> 6.0.?	> 6.0.?
RMI Target		> 6.0.?