Servlet dans un projet EJB

j'ai un probléme dans l'execution de cette Servlet s'il vous plait aidez moi :

Code:

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package controller;
 
import buslogic.HelloWorld;
import buslogic.Person;
import buslogic.PersonManager;
import java.io.IOException;
import java.io.PrintWriter;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
 
@WebServlet(name = "ControllerServlet",
urlPatterns = {"/salut"})
public class ControllerServlet extends HttpServlet {
 
     @EJB
    private PersonManager pm;
 
    // <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 {
    }
 
    /** 
     * 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 {
 
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String userPath = request.getServletPath();
 
        if (userPath.equals(
                "/salut")) {
 
            String nameF = (String) request.getParameter("nameF");
            String nameL = (String) request.getParameter("nameL");
            String nameK = (String) request.getParameter("nameK");
 
 
 
 
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Greetings</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>listes des users: </h1>");
            out.println("<a href=\"index.jsp\"> Add users </a><BR />");
 
            out.println("</body>");
            out.println("</html>");
 
        }
    }
 
        /** 
         * Returns a short description of the servlet.
         * @return a String containing servlet description
         */
        @Override
        public String getServletInfo() {
            return "Controller";
        }// </editor-fold>
    }

et ca me donne comme erruer:

Code:

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exception
 
javax.ejb.EJBException: javax.ejb.EJBException: javax.ejb.CreateException: Could not create stateless EJB

Quand j'execute sans c'est deux lignes ca marche mais l'ajout dans la base de donées ca ne se fait pas :

Code:

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pm.addPerson(new Person(nameF,nameL, nameK));
pm.getUsers();