eclipse-jee HTTP状态404-未找到

HTTP状态404-未找到 java eclipse-jee 正在做跟传智书城类似的项目

环境配置：

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public class ShowIndexServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //查询最近一条公告，传递到index.jsp页面进行展示
        NoticeService nService = new NoticeService();
        Notice notice = nService.getRecentNotice();
        request.setAttribute("n", notice);
        
        //请求转发
        request.getRequestDispatcher("/client/index.jsp").forward(request, response);
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

index.jsp有,在web.xml也有配置,但还是报404
（同样的环境配置itcaststore那个项目就能成功运行，但我的就不行）

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去搜过处理方法了，但是解决不了，就想来问问大家，怎么处理？？
就是想要它能将项目首页（index.jsp-->ShowIndexServlet）显示出来

web.xml中

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这个servlet前有没有 /
serverlet的配置呢 看一下
这个不会是缺省的吧？

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