org.apache.xerces.parsers.XML11Configuration cannot be cast to

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From Evernote:

org.apache.xerces.parsers.XML11Configuration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfigurationCaught exception while loading file struts-default.xml - [unknown location]

Clipped from: http://hi.baidu.com/hxzon/blog/item/9de49458bb29c7d39c8204bc.html
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: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)
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.createDocument(SAX2DOM.java:326)
      at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.<init>(SAX2DOM.java:85)
      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)
      ... 34 more
解决方法:

移除项目目录中的xerces.jar

there was a conflict between tomcat’s internal XML parser and the xerces I was using inside my project.

hxzon:在tomcat单独部署某个struts2.1项目时没有问题，但是同时部署两个struts2.1项目时，出错。把其中一个项目的xerces.jar文件移除，解决。将两个项目的xerces.jar都移除，也没有问题
 
 

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