Exception starting filter struts2 Caught exception while loading file struts-default.xml - [unknown location]

2009-12-3 0:25:10 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
Caught exception while loading file struts-default.xml - [unknown location]
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:839)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:131)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:100)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:130)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
    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.startup.HostConfig.checkResources(HostConfig.java:1116)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1214)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
    at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration
    at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
    at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.<init>(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)
    at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.<init>(SAX2DOM.java:69)
    at com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory.getSerializationHandler(TransletOutputHandlerFactory.java:187)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(TransformerImpl.java:392)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.setResult(TransformerHandlerImpl.java:137)
    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.setup(DomHelper.java:213)
    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:198)
    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:189)
    at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:175)
    at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:115)
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:830)
    ... 21 more
2009-12-3 0:25:10 org.apache.catalina.core.StandardContext start
严重: Error filterStart

解决方案:移除xerces.jar

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