Insertion de données via une servlet

Bonjour,

J'ai un problème d'insertion des données de type heure dans une base de données Oracle à travers une servlet :
Code:
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import java.io.*;
import java.net.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
/**
 *
 * @author Acer
 */
public class i81 extends HttpServlet {
 
static  java.sql.Connection connection () throws ClassNotFoundException, SQLException{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con;
con= DriverManager.getConnection("jdbc:odbc:gestion","ayda","ayda");
return con;
}
/*static java.sql.Connection disconnection  () throws SQLException {
    //Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","system","ayda");
 con.close () ;
return con;
}*/
 
 
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
 
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet i21</title>");  
            out.println("</head>");
            out.println("<body>");
             int no_intervention=Integer.parseInt((String)request.getParameter("t1"));
             Date datei=Date.valueOf((String)request.getParameter("t2"));
             Date heure_debut=Date.valueOf((String)request.getParameter("t3"));
             Date heure_fin=Date.valueOf((String)request.getParameter("t4"));
 
{ 
            Connection c=i81.connection();
 
            Statement s=c.createStatement();
 
             String requete ="insert into intervention (no_intervention,datei,heure_debut,heure_fin) values ("+no_intervention+",'"+datei+"','"+heure_debut+"','"+heure_fin+"')";
            int se=s.executeUpdate(requete);
             out.println(se+"ligne ajoutée");
            out.println("</body>");
            out.println("</html>");}
catch(ClassNotFoundException exp1) 
{ 
out.println("errrreur");
} 
catch(SQLException exp2) 
{out.println("erreur");
 out.println("[Connection.java] - ERR exp2= "+exp2.getMessage());
} 
 
 
 
        } 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
    */
    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
    */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
 
    /** 
    * Returns a short description of the servlet.
    */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}
Merci de m'aider à trouver le problème.