新手上路，第一个struts2实例启动老是出错
如标题，按照struts教程的实例发布一个struts2项目，但是调试了N久，还是报这个同样的错误，网上搜了好多，可是都不能解决我的问题，请各位高手帮我看看：（Myeclipse 6.0 + struts 2.1.6 + tomcat 6.0）

错误信息：
2011-8-30 11:56:56 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:\jdk1.6.0_10\bin;D:\apache-tomcat-6.0.29\bin
2011-8-30 11:56:56 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2011-8-30 11:56:56 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 270 ms
2011-8-30 11:56:56 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2011-8-30 11:56:56 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.29
2011-8-30 11:56:56 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor host-manager.xml
2011-8-30 11:56:56 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml
2011-8-30 11:56:56 org.apache.catalina.startup.HostConfig deployWAR
信息: Deploying web application archive struts2-blank-2.1.6.war
2011-8-30 11:56:56 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-default.xml]
2011-8-30 11:56:57 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Unable to locate configuration files of the name struts-plugin.xml, skipping
2011-8-30 11:56:57 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-plugin.xml]
2011-8-30 11:56:57 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts.xml]
2011-8-30 11:56:57 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory demo
2011-8-30 11:56:57 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory docs
2011-8-30 11:56:57 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory examples
2011-8-30 11:56:57 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2011-8-30 11:56:57 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2011-8-30 11:56:57 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory ROOT
2011-8-30 11:56:57 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory strut2
2011-8-30 11:56:57 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-default.xml]
2011-8-30 11:56:58 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts-plugin.xml]
2011-8-30 11:56:58 com.opensymphony.xwork2.util.logging.commons.CommonsLogger info
信息: Parsing configuration file [struts.xml]
2011-8-30 11:56:58 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
java.lang.NoClassDefFoundError: Lorg/codehaus/plexus/PlexusContainer;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
at java.lang.Class.getDeclaredFields(Class.java:1743)
at com.opensymphony.xwork2.inject.ContainerImpl.addInjectors(ContainerImpl.java:89)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:71)
at com.opensymphony.xwork2.inject.ContainerImpl$1.create(ContainerImpl.java:69)
at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:150)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)

at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:76)
at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:116)
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.<init>(ContainerImpl.java:348)
at com.opensymphony.xwork2.inject.ContainerImpl$5.create(ContainerImpl.java:305)
at com.opensymphony.xwork2.inject.ContainerImpl$5.create(ContainerImpl.java:304)
at com.opensymphony.xwork2.inject.util.ReferenceCache$CallableCreate.call(ReferenceCache.java:150)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.opensymphony.xwork2.inject.util.ReferenceCache.internalCreate(ReferenceCache.java:76)
at com.opensymphony.xwork2.inject.util.ReferenceCache.get(ReferenceCache.java:116)
at com.opensymphony.xwork2.inject.ContainerImpl.getConstructor(ContainerImpl.java:594)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:491)
at com.opensymphony.xwork2.inject.ContainerImpl$7.call(ContainerImpl.java:532)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:581)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:530)
at com.opensymphony.xwork2.config.impl.LocatableFactory.create(LocatableFactory.java:32)
at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:130)
at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51)
at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:507)
at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:517)
at com.opensymphony.xwork2.inject.ContainerImpl$9.call(ContainerImpl.java:548)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:574)
at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:546)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:182)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:360)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:403)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:48)
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:4001)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4651)
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:445)
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(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.ClassNotFoundException: org.codehaus.plexus.PlexusContainer
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 65 more
2011-8-30 11:56:58 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2011-8-30 11:56:58 org.apache.catalina.core.StandardContext start
严重: Context [/strut2] startup failed due to previous errors
2011-8-30 11:56:58 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/strut2] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@14eaec9]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@b533b8]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
2011-8-30 11:56:58 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/strut2] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@569c60]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@3468f4]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.


[解决办法]
org/codehaus/plexus/PlexusContainer 缺少这个类，
你的strut2 的web.xml里是不是配置了filter？
看看有没有 org.codehaus.plexus.PlexusContainer 有就去掉