灵魂-放水

exception

javax.servlet.ServletException: Cannot retrieve mapping for action /showProLists
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:846)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
	org.apache.jsp.apply.showProList_jsp._jspService(showProList_jsp.java:193)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
起初，怀疑是:struts-config.xml里的action配置错误，后来仔细检查，发现无错误，排除此疑！
用到的action：
public class ShowProListAction extends Action {
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm actionForm,
                                HttpServletRequest request,
                                 HttpServletResponse Response) {
      // ShowProListForm form = (ShowProListForm)actionForm;
       
       String temp=request.getParameter("testSecID");
       int ID=Integer.parseInt(temp);
       System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"+ID);
       ShowProListDAO prolistDAO=new ShowProListDAO();

       ArrayList arr=new ArrayList();
       arr=prolistDAO.getProList(ID);
       if(arr==null){
           return mapping.findForward("null");
       }
       if(arr !=null){
           if(arr.size()==0){
               return mapping.findForward("null");
           }
           else{
               request.setAttribute("showProList",arr);
               request.setAttribute("stationID",temp);

               ArrayList proList=(ArrayList)request.getAttribute("showProList");
               for(int i=0;i<proList.size();i++){
               ShowProList projects=(ShowProList)proList.get(i);
               System.out.println(projects.getProjectName());
               }
               System.out.println(temp);

               return mapping.findForward("success");
           }
       }
return mapping.findForward("fail");
    }
}
System.out.println(temp)和System.out.println(projects.getProjectName());
均正常输出。怀疑，return mapping.findForward("success")怀疑这一步跳转错误？
修改过若干遍struts-config.xml文件，依旧未果！！！！！




最后，dxian来帮忙检查，发现实际上，该action类，完全通过了。是在跳转到下个jsp页面后，jsp页面里有一表单form：
部分代码如下：
<html:form action="showProLists" method="post">showProListAction.do
<br><br>
<%
ArrayList proList=(ArrayList)request.getAttribute("showProList");
%>
因为，刚开始写该jsp页面时，是copy了一个过来直接改的，忘记把里的form去掉！结果，发生了错误！
至此，该问题解决！先前都没遇到过这个情况，花了好多时间在这个上面。
末了，要感谢下帮过我无数次的 dxian：）