Tomcat内存泄漏一览

最新推荐文章于 2022-07-30 14:28:47 发布

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本文详细列举了Tomcat中可能导致内存泄漏的各种情况，并提供了从6.0.24和7.0.6版本开始引入的检测及修复措施。包括使用自定义ThreadLocal类、Web应用程序类实例作为ThreadLocal值等问题。

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。

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.?