Mysql java jdbc driver

Bonjour,

jai une bd mysql 5.5
pilote jdbc 5.1.16 sous forme de jar que jai ajoutera ma librairie ( java build path du projet)
jre 1.6

je travaille sous eclipse
voici mon code, le driver se charge mai jarrive pa a acceder a la base ! je suis perdue :!

String pilote = "com.mysql.jdbc.Driver";
try{

Class.forName(pilote);
try{
Connection connexion = DriverManager.getConnection("jdbc:mysql://localhost:3306/mail","root","sp");
System.out.println ("Database connection established"); }
catch (Exception ex){
System.out.println("it doz notSQLException: " + ex.getMessage()); }

//Statement instruction = connexion.createStatement();
//ResultSet resultat = instruction.executeQuery("insert into message(mail_desinateur,mail_destinataire,message) values("+destinateur+","+destinataire+","+message+")");
}
catch (Exception e){
System.out.println("echec pilote : "+e);
}

je recoi cette erreur !

it doz notSQLException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

merci d'avaaaance!