J2EE开发中遇见的Exception(java.lang.ClassNotFoundException: org.apache.struts.action.A

erlchina

　　今天，我在运行我以前用struts2编写的Web项目时，出现了以下错误：
　　java.lang.ClassNotFoundException: org.apache.struts.action.ActionServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1332)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1002)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:900)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3823)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4087)
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:909)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:872)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1106)
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:1019)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1011)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:440)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
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:271)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
2011-10-9 9:58:46 org.apache.catalina.core.ApplicationContext log
严重: Servlet /bbs threw load() exception
javax.servlet.ServletException: Wrapper cannot find servlet class org.apache.struts.action.ActionServlet or a class it depends on
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1012)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:900)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3823)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4087)
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:909)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:872)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1106)
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:1019)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1011)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:440)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
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:271)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
　　以前从来没有遇到，我开始在网上找，但是我全都试了一下，全都不行，以下是我的解决办法：
　　第一步：我首先怀疑是不是我的配置文件出现了错误，我重新配置了一下，但是还是不行。(配置stuts.xml,web.xml你可以从struts2中apps中copy)
　　第二步：我开始怀疑是不是我的jar包出现了问题，因为我以前出现过jar包导错的情况，我又重新导jar包，但还是无济于事。
　　(commons-fileupload,commons-io,commons-lang,freemaker,javassist,ongl,struts2-core,xwork-core).jar包
　　第三步：我开始怀疑是不是我的服务器出现了错误，我开始手动启动Tomcat服务器，果然出现以上错误，原来是服务器出现了问题，我从http://tomcat.apache.org/download-55.cgi重新下载了，试了一下，没有以上错误了
　　总结:当自己遇到错误时，不要慌，要相信自己，因为自己是最棒的，自己要鼓励自己。
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