hibernate - 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 内置了对某些永久代内存泄漏情况的检测。这是我前段时间写的一篇博文，解释了这个 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。恕我直言，这些日志是不言自明的。

Answer 2

大概这不会在您的 webapp 运行时引起问题，只是当您使用 Tomcat 管理器停止 webapp 时会看到这些错误。

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 会耗尽内存。看起来您创建了许多未清理的 ThreadLocals。

您的选择是：

• 找出为什么这些 ThreadLocals 没有被清理。有很多关于在 Tomcat 中跟踪这种内存泄漏的信息，例如http://wiki.apache.org/tomcat/MemoryLeakProtection
• 不要使用 Tomcat 管理器重新启动 webapp，而是重新启动 Tomcat 本身。如果您在该 Tomcat 实例中有任何其他实时 web 应用程序，这不是一个好的选择，但如果您的 web 应用程序是唯一的，则完全可以接受。
• 上面的一个变体：使用管理器重新启动你的 webapp，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新启动 Tomcat 之前，您可以安全地重新启动 webapp 很多次。

Answer 3

我不确定您使用的是哪个版本的 struts2，请确保使用 struts2 标签标记您的 Struts2 问题，否则您将无法得到适当的关注。

这是 struts2 先前版本中的已知错误之一，已在2.3.3.The localContext ThreadLocal 中得到修复。停止/取消部署/重新部署 S2 应用程序时未正确清理。在大多数情况下，这将导致 Web 应用程序 ClassLoader 不会被垃圾收集，从而导致重新部署内存泄漏。

请交叉检查您正在使用的 Struts2 的 whihc 版本，如有必要，请将其升级到最新版本。

有关更多详细信息，请参阅XWork ContainerImpl 导致 ThreadLocal 内存泄漏