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

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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