Java send gmail

Question

I'm dealing with problem sending gmail's from my app, i have following code:

public class Notificator {

public static void main(String[] args) {
    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() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("r","");
                }
            });

    try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("[email protected]"));
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("[email protected]"));
        message.setSubject("Testing Subject");
        message.setText("Dear Mail Crawler," +
                "\n\n No spam to my email, please!");

        Transport.send(message);

        System.out.println("Done");

    } catch (MessagingException e) {
        throw new RuntimeException(e);
    }
}

}

And im getting following error : Exception in thread "main" java.lang.RuntimeException: javax.mail.AuthenticationFailedException: failed to connect

Threfore I enabled access for less secured devices and also enabled intellij in firewall.

edit: Yes i have correct credintials, just erased them before putting here.

Answer 1

You need to specify the gmail account details (email address and password) or you will always receive an Authorisation error.

Here's a sample which i have used previously:

    public JavaMailSender getJavaMailSender() {
        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();

        javaMailSender.setHost("smtp.gmail.com");
        javaMailSender.setPort(587);
        javaMailSender.setUsername("[email protected]");
        javaMailSender.setPassword("GMAIL PASSWORD HERE");

        javaMailSender.setJavaMailProperties(getMailProperties());
        return javaMailSender;
    }

    private Properties getMailProperties() {
        Properties properties = new Properties();
        properties.setProperty("mail.transport.protocol", "smtp"));
        properties.setProperty("mail.smtp.auth", "true");
        properties.setProperty("mail.smtp.starttls.enable", "true");
        properties.setProperty("mail.debug", "false");
        return properties;
    }

    JavaMailSender javaMailSender = getJavaMailSender();

    private void sendEmail(){
        javaMailSender.send((MimeMessage mimeMessage) -> {
            MimeMessageHelper message = new MimeMessageHelper(mimeMessage, true, "UTF-8");
            message.setFrom("[email protected]");
            message.setTo("[email protected]");
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler," +
                "\n\n No spam to my email, please!");
        });
    }