struts2 奇怪的有关问题 ? 不知道大家碰到过否？

严重: Exception starting filter struts2Unable to load configuration. - [unknown location]    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:371)    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:424)    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:213)    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:3693)    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:761)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:741)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1023)    at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1015)    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)    at org.apache.catalina.core.StandardService.start(StandardService.java:448)    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)    at org.apache.catalina.startup.Catalina.start(Catalina.java:552)    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)Caused by: Caught exception while loading file struts-default.xml - [unknown location]    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:879)    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:161)    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:130)    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:155)    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)    ... 30 moreCaused by: java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration    at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)    at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)    at org.apache.xerces.jaxp.DocumentBuilderImpl.<init>(Unknown Source)    at org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)    at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.<init>(SAX2DOM.java:69)    at com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory.getSerializationHandler(TransletOutputHandlerFactory.java:187)    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(TransformerImpl.java:392)    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.setResult(TransformerHandlerImpl.java:137)    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.setup(DomHelper.java:212)    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:197)    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:188)    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:174)    at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:114)    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:870)    ... 34 more2008-7-25 8:09:32 org.apache.catalina.core.StandardContext start严重: Error filterStart2008-7-25 8:09:32 org.apache.catalina.core.StandardContext start严重: Context [/workmass] startup failed due to previous errors2008-7-25 8:09:32 org.apache.coyote.http11.Http11AprProtocol start