tomcat一启动就报错，困扰一天了。望帮助
小弟初学Struts2,利用struts2做了个练习。用的是struts2.3.1.2 IDE：MyEclipse8.6.1
启动其他项目没任何问题，就是这struts2才出现问题。tomcat和MyEclipse都重装了，但还是没解决。参照了一些网上的办法，还是没法解决


2012-2-17 17:48:08 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: C:\Program Files (x86)\Java\jdk1.6.0_10\bin;F:\studytools\Tomcat6.0\bin
2012-2-17 17:48:08 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2012-2-17 17:48:08 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 492 ms
2012-2-17 17:48:08 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2012-2-17 17:48:08 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.35
2012-2-17 17:48:09 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: Could not create JarEntryRevision for [jar:file:/G:/training/struts2/WebRoot/WEB-INF/lib/struts2-core-2.3.1.2.jar]!
java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
at com.opensymphony.xwork2.util.FileManager$JarEntryRevision.build(FileManager.java:309)
at com.opensymphony.xwork2.util.FileManager.loadFile(FileManager.java:145)
at com.opensymphony.xwork2.util.FileManager.loadFile(FileManager.java:105)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:935)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:155)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:122)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:179)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
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.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
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:4072)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4726)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at j