servlet获取xml初始化参数出错，求解答

tomcat是v9.0
esplise是2019-9
这是主要部分代码

xml:

<context-param>
    <param-name>webSite</param-name>
    <param-value>www.itshixun.com</param-value>
  </context-param>
  <context-param>
    <param-name>email</param-name>
    <param-value>admin@itshixun.com</param-value>
  </context-param>
    --------------------------------------------------------------------------
servlet:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=UTF-8");
        Enumeration <String> names=super.getServletContext().getInitParameterNames();
        String websit=super.getServletContext().getInitParameter("webSite");
        String email=super.getServletContext().getInitParameter("email");

        PrintWriter out=response.getWriter();
        while(names.hasMoreElements())
        {
            String name=names.nextElement();
            out.print(name+"<br>");
        }
        out.println(websit+"<br>");
        out.println(email+"<br>");  
    }

运行效果截图