struts2的 jar包冲突问题解决

这两天跑struts2的一个下载功能，开启tomcat时报错：

2013-10-15 10:43:07 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: E:\work\Java\jre6\bin;E:\work\Tomcat 6.0\bin
2013-10-15 10:43:07 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8081
2013-10-15 10:43:07 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 261 ms
2013-10-15 10:43:07 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2013-10-15 10:43:07 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.26
2013-10-15 10:43:07 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml
2013-10-15 10:43:07 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory docs
2013-10-15 10:43:07 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory ROOT
2013-10-15 10:43:07 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory strutsdownload
2013-10-15 10:43:08 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-default.xml]
2013-10-15 10:43:08 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Dispatcher initialization failed
Unable to load configuration. - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.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:390)
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:436)
 at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:195)
 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 bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:235)
 at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:102)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:180)
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
 ... 30 more
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.1.2.jar!/struts-default.xml:29:72 - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:219)
 ... 33 more
2013-10-15 10:43:08 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
Unable to load configuration. - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.jar!/struts-default.xml:29:72
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:449)
 at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:195)
 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. - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.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:390)
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:436)
 ... 28 more
Caused by: Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:235)
 at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:102)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:180)
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
 ... 30 more
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.1.2.jar!/struts-default.xml:29:72 - bean - jar:file:/E:/work/Tomcat%206.0/webapps/strutsdownload/WEB-INF/lib/struts2-core-2.3.4.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:219)
 ... 33 more
2013-10-15 10:43:08 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2013-10-15 10:43:08 org.apache.catalina.core.StandardContext start
严重: Context [/strutsdownload] startup failed due to previous errors

解决方案：在网上找了好多个答案，但是问题没解决，最后在tomcat下的webapps/工程名/WEB-INF/lib/下发现有不同版本的相同jar包存在，问题解决！