Tomcat Java GC 问题 Linux

Question

我正在 Ubuntu 上运行 Tomcat Web 服务器（7.0）。我在本地 Windows 机器上使用 Java 1.6 有相同的 War 文件，并且没有遇到任何问题。然而，在 Linux 机器上，我的 tomcat 一段时间后失败或停止工作，并且出现 Java GC 异常。它以这些错误开始：

Jul 10, 2011 4:29:05 PM org.apache.catalina.startup.HostConfig checkResources 信息：取消部署上下文[/manager] 七月 10, 2011 4:29:05 PM org.apache.catalina.session.StandardManager doUnload 严重：保存持久会话时出现 IOException：java.io.FileNotFoundException：/home/infocomm/tomcat/work/Catalina/localhost/manager/SESSIONS.ser（没有此类文件或目录） java.io.FileNotFoundException: /home/infocomm/tomcat/work/Catalina/localhost/manager/SESSIONS.ser (没有这样的文件或目录)

然后这些错误：

  Jul 10, 2011 4:29:05 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
WARNING: JDBC driver de-registration failed for web application [/manager]
java.lang.NullPointerException
    at org.apache.catalina.loader.WebappClassLoader.clearReferencesJdbc(WebappClassLoader.java:2012)
    at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1948)
    at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1860)
    at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:659)
    at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:216)
    at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5032)
    at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:216)
    at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:952)
    at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1199)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1360)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:290)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:89)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1228)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1384)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1394)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1373)
    at java.lang.Thread.run(Thread.java:619)
Jul 10, 2011 4:29:05 PM org.apache.catalina.util.LifecycleBase destroy
INFO: The destroy() method was called on component [StandardContext[/manager]] after destroy() had already been called. The second call will be ignored.
Jul 10, 2011 4:29:05 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context []
Jul 10, 2011 4:29:05 PM org.apache.catalina.session.StandardManager doUnload

然后最后 TOmcat 停止响应这些错误：

Jul 10, 2011 5:07:44 PM org.apache.catalina.util.LifecycleBase destroy
INFO: The destroy() method was called on component [StandardContext[/host-manager]] after destroy() had already been called. The second call will be ignored.
Jul 10, 2011 6:31:44 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor rcbp.xml from /home/infocomm/tomcat/conf/Catalina/localhost
Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: PermGen space

非常感谢任何帮助。 仅当我退出启动 Tomcat 应用程序的远程 shell 后，才会发生这种情况。

Answer 1

tomcat（当使用特定用户帐户运行时）是否有权访问此文件，它应该有足够的权限创建、更新和？删除该文件。

/home/infocomm/tomcat/work/Catalina/localhost/manager/SESSIONS.ser

除非您以非特权用户身份启动 tomcat，否则这种情况很少出现。