je voulais faire la coordination entre servlet + hibernate mais jobtien lerreur suivante :
exception

exception
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javax.servlet.ServletException: L''exécution de la servlet a lancé une exception
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
cause mère
 
java.lang.NoClassDefFoundError: Soko/HibernateUtil
	Controllers.InsertServlet.doGet(InsertServlet.java:73)
	Controllers.InsertServlet.doPost(InsertServlet.java:102)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
cause mère
 
java.lang.ClassNotFoundException: Soko.HibernateUtil
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
	Controllers.InsertServlet.doGet(InsertServlet.java:73)
	Controllers.InsertServlet.doPost(InsertServlet.java:102)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
 
voici mon servlet qui recupere les donnèes dun formulaire:
package Controllers;
 
import Soko.HibernateUtil;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import Soko.*;
/**
 *
 * @author Abdoul aziz
 */
@WebServlet(name = "InsertServlet", urlPatterns = {"/InsertServlet"})
public class InsertServlet extends HttpServlet {
 
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> 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
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet InsertServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet InsertServlet at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
             */
        } 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 {
        String n = request.getParameter("txtn");
        String p = request.getParameter("txtp");
        String s = request.getParameter("txte");
        String e = request.getParameter("txtpass");
        String f = request.getParameter("txtpay");
        Calendar c=Calendar.getInstance();
        String txt = c.get(Calendar.DAY_OF_MONTH)+"/"+c.get((Calendar.MONTH)+1)+"/"+c.get(Calendar.YEAR);
 
        try{
                org.hibernate.Session h;
                h = HibernateUtil.getSessionFactory().getCurrentSession();
                //Session ss = HibernateUtil.getSessionFactory().openSession();
                //ss.beginTransaction();
                //h.beginTransaction();
                //User u = new User();
                //u.setLogin(n);
                //u.setPassword(p);
                //u.setEmail(s);
                //u.setNom(e);
                //u.setPrenom(f);
                //u.setDateinsrption(txt);
                //h.save(u);
                //h.getTransaction().commit();
           }
        catch(Exception e1){
            e1.getMessage();
        }
    }
 
    /** 
     * 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 {
       doGet(request,response);
    }
 
    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
 
l foichier hibernateUtil:
 
package Soko;
 
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.SessionFactory;
 
/**
 * Hibernate Utility class with a convenient method to get Session Factory object.
 *
 * @author Abdoul aziz
 */
public class HibernateUtil {
 
    private static final SessionFactory sessionFactory;
 
    static {
        try {
            // Create the SessionFactory from standard (hibernate.cfg.xml) 
            // config file.
            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Log the exception. 
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
 
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}