public void envoye(String adressMail, String ContenuMail, String subject) {

    boolean debug = false;

    //Set the host smtp address
    Properties props = new Properties();
    props.put("mail.smtp.starttls.enable", true);
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.user", "eshop.tunisiepidev@gmail.com");
    props.put("mail.smtp.password", "eshoppidev");
    props.put("mail.smtp.port", 587);
    props.put("mail.smtp.auth", true);
    props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
    Session session = Session.getDefaultInstance(props, null);
    session.setDebug(debug);

    Message msg = new MimeMessage(session);

    InternetAddress addressFrom;
    try {
        addressFrom = new InternetAddress("eshop.tunisiepidev@gmail.com");

        InternetAddress addressTo = new InternetAddress(adressMail);

        msg.setRecipient(Message.RecipientType.TO, addressTo);
        msg.setFrom(addressFrom);

        msg.setSubject(subject);
        msg.setText(ContenuMail);
        Transport t = session.getTransport("smtp");
        t.connect("smtp.gmail.com", "eshop.tunisiepidev@gmail.com", "eshoppidev");
        t.sendMessage(msg, msg.getAllRecipients());
        t.close();
    } catch (MessagingException ex) {
        ex.printStackTrace();
    }
}

Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;