Exception starting filter struts2 java.lang.NullPointerException

at com.opensymphony.xwork2.util.FileManager$FileRevision.needsReloading(FileManager.java:209)at com.opensymphony.xwork2.util.FileManager.fileNeedsReloading(FileManager.java:60)at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.needsReload(XmlConfigurationProvider.java:325)at org.apache.struts2.config.StrutsXmlConfigurationProvider.needsReload(StrutsXmlConfigurationProvider.java:168)at com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:220)at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:61)at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:774)at org.apache.struts2.dispatcher.ng.InitOperations.initStaticContentLoader(InitOperations.java:77)at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:49)at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3800)at org.apache.catalina.core.StandardContext.start(StandardContext.java:4450)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)at org.apache.catalina.core.StandardService.start(StandardService.java:516)at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)at org.apache.catalina.startup.Catalina.start(Catalina.java:583)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)2011-11-5 22:19:13 org.apache.catalina.core.StandardContext start严重: Error filterStart2011-11-5 22:19:13 org.apache.catalina.core.StandardContext start严重: Context [/Struts2_0400_Path] startup failed due to previous errors2011-11-5 22:19:13 org.apache.coyote.http11.Http11Protocol start

<constant name="struts.devMode" value="true"/> 或者
<constant name="struts.configuration.xml.reload" value="true"/>

 devMode模式是开发模式，开启它则默认开启了i18n.reload、configuration.xml.reload。这个错误是由于configuration.xml.reload设置为true导致的， 原因很简单，tomcat的安装路径包含空格

把tomcat安装目录里的 空格删了就行了......试试吧...很简单的..

.再 把 myEclipse的工作区间 的 空格 去了....都不要  空格

把那两个冲突的东西都注释掉...i18n.reload、configuration.xml.reload...注释...