Question

我们在生产环境中使用apache-tomcat-8.0.20。

我们的应用程序（Japha）突然崩溃，服务器由于跟随错误而自动关闭：

25-Nov-2015 05:20:37.311 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [Japha] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@2472eccc]) and a value of type [com.sun.xml.stream.XMLReaderImpl] (value [com.sun.xml.stream.XMLReaderImpl@24d1f33]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
25-Nov-2015 05:20:37.311 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [Japha] created a ThreadLocal with key of type [com.sun.xml.bind.v2.runtime.Coordinator$1] (value [com.sun.xml.bind.v2.runtime.Coordinator$1@73b0e605d]) and a value of type [com.sun.xml.bind.v2.runtime.Coordinator[]] (value [[Lcom.sun.xml.bind.v2.runtime.Coordinator;@2d42463a5b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

最后它停止了所有连接器

25-Nov-2015 05:20:37.327 SEVERE [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks The web application [Japha] created a ThreadLocal with key of type [com.sun.xml.ws.api.client.ServiceInterceptorFactory$1] (value [com.sun.xml.ws.api.client.ServiceInterceptorFactory$1@434ba48d]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
25-Nov-2015 05:20:37.356 INFO [Thread-7] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8080"]
25-Nov-2015 05:20:37.453 INFO [Thread-7] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-8009"]
25-Nov-2015 05:20:37.462 INFO [Thread-7] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8080"]
25-Nov-2015 05:20:37.464 INFO [Thread-7] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-8009"]

最终用户在此时间段内没有记录客户活动，因为它是清晨。我们只是重新启动服务器，一切正常。但是重新启动最佳解决方案吗？或者这个问题会再次发生吗？

Answer 1

因为在每次重新部署时重新启动Tomcat，所以内存泄漏不是由Tomcats WebappClassLoader的类加载器泄漏引起的，这是与Tomcat相关的内存泄漏的最常见原因。因此，您可以忽略我在评论中发布的链接。

相反，您应该添加VM参数-XX:+HeapDumpOnOutOfMemoryError，以便在发生OutOfMemoryError时创建堆转储。再次发生这种情况时，您可以使用堆转储分析器（如Eclipse MAT）打开堆转储。在那里你可以做进一步的调查，以找到泄漏的原因。你可以，例如查看统治者树，以便找到通过引用保存最多内存的对象。如果你发现了一些可疑的东西，你可以在这里发布Eclipse MAT的截图。

如果您不想等到OutOfMemoryError再次出现，那么您也可以在应用程序运行一段时间后手动创建堆转储并进行分析。

Tomcat：由于Threadlocal，重启只是内存泄漏的解决方案吗？

1 个答案: