Metodo com anotação @PostConstruct não é chamado

Assuntos Gerais
#1

Pessoal seguinte, iniciei os meus estudos em ejb e estou com esse problema, marquei um metodo com a anotação @PostConstruct mais o metodo não é chamado.
Código:
Calculadora.java

@Stateless
public class Calculadora {
    public double soma(double a, double b){
        return a + b;
    }
    @PostConstruct
    public void mensagemRealizandoCalculo(){
        System.out.println("Calculo a ser realizado");
    }
}

CalculadoraController.java

[code]
public class CalculadoraController extends HttpServlet {
/**
* Processes requests for both HTTP
* GET and
* POST methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@EJB
private Calculadora calculadora;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(“text/html;charset=UTF-8”);
PrintWriter out = response.getWriter();
double soma = calculadora.soma(2, 2);
out.write("O resultado da soma é " + soma);
}

// <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>

}[/code]

#2

Problema resolvido

#3