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 |
| >=6.0.24 |
>= 7.0.6
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| >=6.0.24 |
>= 7.0.6 |
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| Webapp class instance indirectly held through a ThreadLocal value |
no |
>= 7.0.6 |
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| >=6.0.24 |
>= 7.0.6 |
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| >=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 |
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| 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) |
| no |
>=6.0.24 pre-spawns some known offenders |
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| no |
> 6.0.? . Disabled by default with tomcat 7 |
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| > 6.0.? |
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| > 6.0.? |
> 6.0.? |
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| > 6.0.? |