Java.sql.SQLException: Io exception:

import java.sql.*;
import java.util.Date;

public class Connexion
{
	public  static String       nomDriver = "oracle.jdbc.driver.OracleDriver";
	public  static String       urlBddWin = "jdbc:oracle:thin:@ localhost:1521:ORCL";
	public  static String       userWin   = "srdemo";
	public  static String       passWin   = "oracle";
	public  static Connection   con;
	private static Statement    stmt      = null;

	public Connexion ()
	{
		try
		{
			// Chargement du pilote Oracle
			Class.forName(nomDriver);			
			//Connexion a la base Oracle sur Windows
                        con = DriverManager.getConnection(urlBddWin, userWin, passWin);
	                // creation du statement
                        stmt = con.createStatement();
		}
		catch(ClassNotFoundException  e1)
               {
                   System.err.println("[Connexion.java] Connexion - ERR e1= "+e1.getMessage());
                }
		catch(SQLException            e2)
              {
                  System.err.println("[Connexion.java] Connexion - ERR e2= "+e2.getMessage());
              }
	}
	
	public static ResultSet ExecuteQuery(String uneRequete)
        {
		ResultSet rs = null;
		try
                {
			rs = stmt.executeQuery(uneRequete);
		}
                catch(Exception e1)
               {
                   System.err.println("[Connexion.java] ExecuteQuery - ERR e1= "+e1.getMessage());
                }

                return rs;			
	}
	
	public static int ExecuteUpdate(String uneRequete)
        {
		int set = 0;

		try
                {
 			set = stmt.executeUpdate(uneRequete); 
                        con.commit();
		}
               catch(Exception e1)
               {
		   System.err.println("[Connexion.java] ExecuteUpdate("+uneRequete+") - ERR e1= "+e1.getMessage());
	        }

                return set;			
	}

	public void monclose()
        {
		try
               {
                   con.close();
		}
               catch (SQLException e1)
               {
                    System.err.println("[Connexion.java] monclose - ERR e1= " + e1.getMessage());
		}
	}
}