Struts 2.1.8.1 + Hibernate + Spring 整合出现的问题

严重: Exception starting filter struts2
Unable to load configuration. - [unknown location]
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:431)
	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488)
	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:546)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
	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:785)
	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:519)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: Unable 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:374)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:418)
	... 28 more
Caused by: Caught exception while loading file struts-default.xml - [unknown location]
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles

(XmlConfigurationProvider.java:902)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments

(XmlConfigurationProvider.java:143)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:110)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:168)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
	... 30 more
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(Unknown Source)
	at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.<init>(Unknown Source)
	at com.sun.org.apache.xalan.internal.xsltc.runtime.output.TransletOutputHandlerFactory.getSerializationHandler

(Unknown Source)
	at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getOutputHandler(Unknown Source)
	at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerHandlerImpl.setResult(Unknown Source)
	at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.setup(DomHelper.java:205)
	at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:190)
	at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:181)
	at com.opensymphony.xwork2.util.DomHelper$DOMBuilder.<init>(DomHelper.java:167)
	at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:107)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles

(XmlConfigurationProvider.java:893)
	... 34 more
2010-4-29 22:07:11 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2010-4-29 22:07:11 org.apache.catalina.core.StandardContext start
严重: Context [/kaoqin] startup failed due to previous errors

  该问题比较郁闷，网上找到的方法都不能对症下药。

  解决方法：去掉 xerces.jar 这个包就没事了。

  上网搜索一下，发现 Xerces 是一个开放源代码的XML语法分析器。