使用Gmail SMTP的JavaMail-无法发送邮件

Question

I want to send an email with JavaMail, but every time I get an exception. I've create a JFrame project, and I created an actionevent for a button:

  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
  Properties props = new Properties();
  props.put("mail.smtp.host", "smtp.gmail.com");
  props.put("mail.smtp.socketFactory.port", "465");
  props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
  props.put("mail.smtp.auth", "true");
  props.put("mail.smtp.port", "465");

  Session session = Session.getDefaultInstance(props,
          new javax.mail.Authenticator() {
              @Override
              protected PasswordAuthentication getPasswordAuthentication() {
                  return new PasswordAuthentication("xyz@gmail.com", "###");
              }
          }
  );
  //I've tried also this version of the Session:
  //Session session = Session.getInstance(props,new NewEmpty("xyz@gmail.com","###"));
  try {
      Message message = new MimeMessage(session);
      message.setFrom(new InternetAddress("xyz@gmail.com"));
      message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("zyx@gmail.com"));
      message.setSubject("Hi");
      message.setText("Helló!");

      Transport.send(message);
      JOptionPane.showMessageDialog(null, "Sent!");
  }catch(Exception e) {
      JOptionPane.showMessageDialog(null, e);
  }

}                                        

}

The Exception is:

Answer 1

Your screenshot shows an SSL handshake error.

You probably have to import their SSL certificate or the root certificate into your own java trust/keystore.

I found a tutorial for this part which describes the single steps.