严重: Exception starting filter struts2

java.lang.NullPointerException

 at com.opensymphony.xwork2.util.FileManager$FileRevision.needsReloading(FileManager.java:)

 at com.opensymphony.xwork2.util.FileManager.fileNeedsReloading(FileManager.java:)

 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.needsReload(XmlConfigurationProvider.java:)

 at org.apache.struts2.config.StrutsXmlConfigurationProvider.needsReload(StrutsXmlConfigurationProvider.java:)

 at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:)

 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:)

 at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:)

 at org.apache.struts2.dispatcher.ng.InitOperations.initStaticContentLoader(InitOperations.java:)

 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:)

 at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:)

 at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:)

 at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:)

 at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:)

 at org.apache.catalina.core.StandardContext.start(StandardContext.java:)

 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:)

 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:)

 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:)

 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:)

 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:)

 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:)

 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:)

 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:)

 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:)

 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:)

 at org.apache.catalina.core.StandardHost.start(StandardHost.java:)

 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:)

 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:)

 at org.apache.catalina.core.StandardService.start(StandardService.java:)

 at org.apache.catalina.core.StandardServer.start(StandardServer.java:)

 at org.apache.catalina.startup.Catalina.start(Catalina.java:)

 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)

 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)

 at java.lang.reflect.Method.invoke(Method.java:)

 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:)

 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:)

-- :: org.apache.catalina.core.StandardContext start