Ho creato un progetto java, ho configurato il web.xml correttamente e attraverso una jsp chiamo una servlet

ecco il codice della jsp:
codice:
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Gestione processi</h1>
        

        <div class="clsDivForm" name="divForm">
            <form name="frmFindProcess" action="/Sipad/Servlet?azione=findProcess" method="POST">
                <input type="submit" class="clsFindProcess"     value="Cerca processo"    name="btnFindProcess"/>
            </form>
            



            <form name="frmStartProcess" action="/Sipad/Servlet?azione=startProcess" method="POST">
                <input type="submit" class="clsStartProcess"     value="Avvia processo"   name="btnStartProcess"/>
             </form>   
             



            <form name="frmStopProcess" action="/Sipad/Servlet?azione=stopProcess"  method="POST">
                <input type="submit" class="clsStopProcess"      value="Ferma processo"   name="btnStopProcess"/>
            </form>
        </div>
    </body>
</html>
Ecco il codice della servlet

codice:
package controller;

import java.io.*;
import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*;
import java.net.*;

public class ServletController extends HttpServlet {
    
    private ServletContext context;
    
    public void init(ServletConfig config) throws ServletException
    {
        context = config.getServletContext();

    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException 
    {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String tiporichiesta = request.getParameter("azione");
        if (tiporichiesta == null)
            forward(request, response, "/index.jsp");
        else
            forward(request, response, "/index.jsp");
        out.close();
    }
    
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException 
    {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException 
    {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() 
    {
        return "Short description";
    }
    // </editor-fold>

    private void forward(HttpServletRequest request,HttpServletResponse response, String url)  throws ServletException, IOException
    {
        RequestDispatcher rd = context.getRequestDispatcher(url);
        rd.forward(request, response);
    }
}
Putroppo non ho nessun tipo di errore, però mi visualizza la schermata bianca senza nessun risultato. ferma sulla servlet.. Quale potrebbe essere il problema?

Grazie anticipatamente