我在tomcat控制台中遇到内存泄漏异常

Question

Aug 29, 2012 12:47:44 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-443
Aug 29, 2012 12:47:44 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-80
Aug 29, 2012 12:47:45 PM org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JBDC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JBDC driver [oracle.jdbc.driver.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-1] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [MultiThreadedHttpConnectionManager cleanup] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-2] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [] appears to have started a thread named [Timer-3] but has failed to stop it. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@3d1848]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1055eb1]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@1720e5c]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@10cc503]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@15a82f7]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@14c4cc7]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@44aeeb]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@137fac1]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@2fa904]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1016caf]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@867ca8]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@162062c]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@8345e0]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.commons.lang.builder.ToStringStyle$1] (value [org.apache.commons.lang.builder.ToStringStyle$1@60994a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1eff48d]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@a05e2e]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@872ebe]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@10dbc37]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@bfd4f6]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@366c17]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@f2938f]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@1b593d2]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1fbe9e6]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1b9305f]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@116d3cf]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1abf1f6]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@19a61d3]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@8c6891]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@254464]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@ad40e8]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@807a29]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@d440fc]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@f663e4]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@183b5d]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@67272d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@e16306]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Aug 29, 2012 12:47:45 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [] created a ThreadLocal with key of type [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1] (value [org.apache.xml.security.utils.UnsyncByteArrayOutputStream$1@18bbe2b]) and a value of type [byte[]] (value [[B@12c4f94]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.

Answer 1

Tomcat内置了对某些永久生成内存泄漏情况的检测。这是我前段时间写的一篇博客文章，它解释了这次PermGen泄漏是什么：http://plumbr.eu/blog/what-is-a-permgen-leak。您应该检查您的应用程序以找出Tomcat发现的问题的原因。我认为这些日志是不言自明的。

Answer 2

大概这不会在你的webapp运行时引起问题，只是当你使用Tomcat管理器停止你的webapp时，你会看到这些错误。

Tomcat不能释放你的webapp使用的所有内存，所以在某些时候，如果你反复重启你的webapp，Tomcat就会耗尽内存。看起来你有许多正在创建的ThreadLocals没有被清理。

您可以选择：

• 找出这些ThreadLocals没有被清理的原因。关于跟踪Tomcat中的这种内存泄漏，有相当多的信息，例如使用Tomcat管理器重新启动lot应用程序的http://wiki.apache.org/tomcat/MemoryLeakProtection
• Instead，重新启动Tomcat本身。如果您在Tomcat实例中有任何其他活动的webapp，则不是一个好的选择，但如果您的webapp是唯一的，则完全可以接受。
• 上面的一个变种:使用管理器重新启动你的not应用，但要注意它使用了多少内存(泄漏可能不是特别严重)。然后在必要时重新启动Tomcat。您可能会发现，在需要完全重启Tomcat之前，您可以安全地重启few应用程序多次。

Answer 3

我不确定您使用的是哪个版本的struts2，请确保使用Struts2标签来标记您的struts2问题，否则您将无法获得适当的关注。

这是struts2早期版本中的已知错误之一，已在2.3.3.The中修复，当停止/取消部署/重新部署S2应用程序时，localContext ThreadLocal未正确清理。在大多数情况下，这将导致web应用程序ClassLoader不被垃圾收集，从而导致重新部署内存泄漏。

请交叉检查您正在使用的Struts2版本，如果需要，请将其升级到最新版本。

有关更多详细信息，请参阅XWork ContainerImpl causes ThreadLocal memory leak