Connexion netbeans base se donnée

private void connexion(){    
    String login,mdp;
        String hote,inst;
        login = txtlogin.getText();
        mdp = new String(txtmpasse.getPassword());
        hote = txthote.getText();
        inst = txtinstance.getText();

        try{
            DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
            cnx = DriverManager.getConnection("jdbc:oracle:thin:@"+hote+":1521:"+inst,login,mdp);
            connecter = true;
            System.out.println("connecté");
        }catch(Exception e){
            System.err.println("Erreur de connexion"+ e.toString());
        }
}