Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils

1、错误描述

警告: Could not create JarEntryRevision for [jar:file:/D:/MyEclipse/apache-tomcat-7.0.53/webapps/FirstSSH/WEB-INF/lib/struts2-core-2.3.16.3.jar]!
java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
	at com.opensymphony.xwork2.util.fs.JarEntryRevision.build(JarEntryRevision.java:50)
	at com.opensymphony.xwork2.util.fs.DefaultFileManager.monitorFile(DefaultFileManager.java:97)
	at com.opensymphony.xwork2.util.fs.DefaultFileManager.loadFile(DefaultFileManager.java:74)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:1011)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:165)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:132)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:233)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:445)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:489)
	at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:105)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1229)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1875)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	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: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	... 29 more
2014-7-10 23:12:23 com.opensymphony.xwork2.util.logging.jdk.JdkLogger info
信息: Parsing configuration file [struts-default.xml]

2、错误原因

     一般的，通过“Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils”，知道缺少commons-io-2.2.jar包

3、解决办法

      将“commons-io-2.2.jar”复制到lib文件夹目录下，然后重启服务