这个报错只有IDEA会有问题，在eclipse并不会出现这个问题。
有哪位前辈可以帮我指点迷津吗?

public class ServletDemo02 extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    doGet(request, response);
}

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //获取客户端提交到服务端的method对应的值
    String md=request.getParameter("method");
    //定义变量,存放功能执行完毕之后要转发的路径
    String path=null;
    //获取到当前字节码对象(ServletDemo02.class在内存中对象)
    Class clazz = this.getClass();
    try {
        //获取clazz上名称为md方法
        Method method=clazz.getMethod(md, HttpServletRequest.class,HttpServletResponse.class);
        if(null!=method){
            //调用找到的方法
            path=(String)method.invoke(this, request,response);
        }
        if(null!=path){
            //服务端的转发
            request.getRequestDispatcher(path).forward(request, response);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }



}

public String addStu(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    System.out.println("添加学生");
    return "/test.html";

}



}