严重: Exception starting filter struts java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils

配置struts2时，tomcat报错如下：

严重: Exception starting filter struts

java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:211)

at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:102)

at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:234)

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.FilterDispatcher.init(FilterDispatcher.java:193)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)

at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3693)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4340)

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:525)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)

at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)

at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1206)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)

at java.lang.Thread.run(Thread.java:744)

Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang3.StringUtils

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)

... 26 more

三月 03, 2014 1:46:28 下午 org.apache.catalina.core.StandardContext start

严重: Error filterStart

三月 03, 2014 1:46:28 下午 org.apache.catalina.core.StandardContext start

严重: Context [/Struts2Test] startup failed due to previous errors

解决方法：把commons-lang.jar升级到新版，我原本用的是commons-lang-2.3.jar

现在更换成commons-lang3-3.1.jar 后，启动正常！