مشكلة بstruts

package com.struts.controleur;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.util.*;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.hibernate.*;

import com.DB.Service;

import com.struts.data.*;

public class AjoutServiceAction extends Action{

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest req,

HttpServletResponse res) throws Exception {

String resultat = null;

Integer NoEns = ((ServiceForm)form).getNoEns();

String CodeUe=((ServiceForm)form).getModule().getCodeUe();

Integer NbHceff=((ServiceForm)form).getNbHceff();

Integer NbHtdeff=((ServiceForm)form).getNbHtdeff();

Integer NbHtpeff=((ServiceForm)form).getNbHtpeff();

try{

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

Service s=new Service();

s.getModule().setCodeUe(CodeUe);

s.setNoEns(NoEns);

s.setNbHceff(NbHceff);

s.setNbHtdeff(NbHtdeff);

s.setNbHtpeff(NbHtpeff);

session.save(s);

session.getTransaction().commit();

HibernateUtil.getSessionFactory().close();

resultat = "succes";

}catch(Exception ex){

HibernateUtil.getSessionFactory().close();

resultat = "echec";

}

return mapping.findForward(resultat);

}

}