Java - ubuntu y java

public class Proceso {

    static String username,contraseña;

    static Properties p;

    static Session sesion;

    public static void main(String args[]){

        try {

            setup();

            Ventana v = new Ventana(sesion);

        } catch (Exception ex) {

            Logger.getLogger(Proceso.class.getName()).log(Level.SEVERE, null, ex);

        }

    }

    private static void setup() throws MessagingException {

        //datos de conexion

        username = "tuUsername@gmail.com";

        contraseña = "tuContraseña";

	//propiedades de la conexion

        p = new Properties();

        p.put("mail.smtp.auth", "true");

        p.put("mail.smtp.starttls.enable", "true");

        p.put("mail.smtp.host", "smtp.gmail.com");

        p.put("mail.smtp.port", "587");

        //creamos la sesion

        sesion = crearSesion();

    }

    private static Session crearSesion() {

        Session session = Session.getInstance(p,

          new javax.mail.Authenticator() {

            @Override

                protected PasswordAuthentication getPasswordAuthentication() {

                        return new PasswordAuthentication(username, contraseña);

                }

          });

        return session;

    }

}