tomcat服务器的初始配置问题

今天下午遇到一个问题，在tomcat上重新配置项目启动的时候出现了，

org.apache.catalina.core.StandardContext filterStart

严重: 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.FilterDispatcher.init(FilterDispatcher.java:191)

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:3709)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4363)

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:525)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)

at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)

at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)

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:578)

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)

2009-2-4 22:40:54 org.apache.catalina.core.StandardContext start

严重: Error filterStart

2009-2-4 22:40:54 org.apache.catalina.core.StandardContext start

严重: Context [/Struts2Demo2] startup failed due to previous errors

网上的好多人说是struts2的bug具体的原因我还真不知道，看到网上说是因为tomcat的路径支持空格，和这个原因有关。然后，我就把tomcat卸掉，重新安装了一遍（在重新安装的过程中可能会出现警告框，直接点忽略就可以了），在安装的过程中在选择安装路径的时候要把，tomcat 6.0之间的空格去掉，然后启动，问题解决。

这次的问题，具体的愿意我也搞不懂，如果有哪位大神看见了呢，我们可以探讨。有什么不对的呢，还请指出，这个问题我还真不太明白，主要是对tomcat的原理不太清楚。