myeclipse9.0+tomcat6.0web-xml如下：<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"         xmlns="http://java.sun.com/xml/ns/javaee"         xmlns:xsi="http://java.sun.com/xml/ns/javaee         http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">    <filter>          <filter-name>struts2</filter-name>          <filter-class>ora.apache.struts2.dispatcher.FilterDispatcher</filter-class>        </filter>        <!--Struts2的Filter的URI配置 -->        <filter-mapping>           <filter-name>struts2</filter-name>           <url-pattern>/*</url-pattern>        </filter-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>        </web-app>struts.xml如下：<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>  <package name="struts2" extends="struts-default">     <action name="login" class="com.struts2.action.LoginAction">           <result name="success">/welcome.jsp</result>           <result name="error">/error.jsp</result>     </action>            </package></struts>

类不存在！！！！或者是值指向错误