Non riesco a raccapezzarmici.
il codice della servlet è:
codice:
package controller;

import entities.TrackContainer;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.ejb.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import session.TrackContainerFacadeLocal;
import swich.controller;
import swich.controllerLocal;

/**
 *
 * @author
 */
public class TrackTrace extends HttpServlet {
    @EJB
    private controllerLocal controller;
    /*@EJB
    private TrackContainerFacadeLocal trackContainer; */


    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        
        request.getRequestDispatcher("/table.jsp").forward(request,response);
        try {
            List listaMazzetti = (List) controller.findMazzetti();
             request.setAttribute("Mazzetti", listaMazzetti);
                System.out.println(listaMazzetti.size());
             Iterator it = listaMazzetti.iterator();
             while(it.hasNext())
                 System.out.println(listaMazzetti);
        } finally { 
            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
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    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
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
Vi ringrazio per l'aiuto che mi darete.