Unable to load configuration

Exception starting filter struts2
Unable to load configuration. - bean - jar:file:/E:/tomcat-7.0.11/webapps/struts/WEB-INF/lib/struts2-core-2.2.3.jar!/struts-default.xml:29:72
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:195)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:273)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:254)
	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:372)
	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:98)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4542)
	at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5220)
	at org.apache.catalina.core.StandardContext$2.call(StandardContext.java:5215)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
Caused by: Unable to load configuration. - bean - jar:file:/E:/tomcat-7.0.11/webapps/struts/WEB-INF/lib/struts2-core-2.2.3.jar!/struts-default.xml:29:72
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:69)
	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:380)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:424)
	... 13 more
Caused by: Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/E:/tomcat-7.0.11/webapps/struts/WEB-INF/lib/struts2-core-2.2.3.jar!/struts-default.xml:29:72
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:232)
	at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:180)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
	... 15 more
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/E:/tomcat-7.0.11/lib/struts2-core-2.2.3.jar!/struts-default.xml:29:72 - bean - jar:file:/E:/tomcat-7.0.11/webapps/struts/WEB-INF/lib/struts2-core-2.2.3.jar!/struts-default.xml:29:72
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:216)
	... 18 more
2011-6-10 13:15:53 org.apache.catalina.core.StandardContext startInternal
严重: Error filterStart

给力回答：

file:/E:/tomcat-7.0.11/webapps/struts/WEB-INF/lib/struts2-core-2.2.3.jar按照这路径找到struts2-core-2.2.3.jar文件，在这路径中存在相同类型的jar包（版本不一样），删除不适合你当前项目的一个，一般是删除旧版本的！我也刚遇到这问题了，琢磨了很久，发现了这个原因！