java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
初学struts2.2.1环境是tomcat5.5+myeclipse6.5+Jdk1.6,运行时总是出现这个错误，但又不影响运行结果，想问一下啊高手们，怎么解决这个问题，那些struts2的包都导入了


严重: Error loading WebappClassLoader
  delegate: false
  repositories:
  /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@ffc3eb
 org.apache.struts.action.ActionServlet
java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1338)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1187)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1027)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:925)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3880)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4141)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:910)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:873)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1118)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1020)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:680)
at org.apache.catalina.startup.Catalina.start(Catalina.java:536)
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:275)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2011-9-7 12:47:14 org.apache.catalina.core.StandardContext loadOnStartup
严重: Servlet /struts2 threw load() exception
java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1338)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1187)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1027)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:925)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3880)
at org.apache.catalina.core.StandardContext