郁闷的richfaces问题

各位专家请指点richfaces问题     各位专家请指点，小弟我在jsf框架项目中添加richfaces应用时，当在原本能打开的.jsp页面中添加richfaces代码后，页面就打不开了，提示：404错误。郁闷呀！
     页面代码如下：
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j" %>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich" %><html>
<head></head>
  
<body>
 <f:view>
  This is my JSF JSP page. <br>
  <h:form>
   <h:panelGrid>
    <a4j:commandButton value="点击" action="#{bean.click}" reRender="output"/>
    <hutputText id="output" value="#{bean.text}"/>
   </h:panelGrid>
  </h:form>
 </f:view>
</body>
</html>
 
web.xml如下：
context-param>
    <param-name>javax.faces.CONFIG_FILES</param-name> 
    <param-value>/WEB-INF/faces-config.xml</param-value> 
  </context-param>
  
  <context-param>
    <param-name>org.richfaces.SKIN</param-name> 
    <param-value>blueSky</param-value> 
  </context-param>
  
  <context-param>
    <param-name>org.ajax4jsf.VIEW_HANDLERS</param-name> 
    <param-value>com.sun.facelets.FaceletViewHandler</param-value> 
  </context-param>
  
  <filter>
    <display-name>RichFaces Filter</display-name> 
    <filter-name>richfaces</filter-name> 
    <filter-class>org.ajax4jsf.Filter</filter-class> 
  </filter>
  
  <filter-mapping>
    <filter-name>richfaces</filter-name> 
    <servlet-name>Faces Servlet</servlet-name> 
    <dispatcher>REQUEST</dispatcher> 
    <dispatcher>FORWARD</dispatcher> 
    <dispatcher>INCLUDE</dispatcher> 
  </filter-mapping>
 
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.faces</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>