javax.mail.AuthenticationFailedException is thrown while sending email in java

I am beginner in java and I want to send an email in java, for that I am using this code in Java. But my code is throwing an exception, and I need a heads-up why…

This is stack trace of exception:

javax.mail.AuthenticationFailedException: 534-5.7.14 <https://accounts.google.com/ContinueSignIn?sarp=1&scc=1&plt=AKgnsbsNX
534-5.7.14 No6jJbDc4l7fZ_WLdBD0sNHIIp_nLvplRMm0bYFBnZBF_XOyVvNSdd1FenDZJPwBTFQyRH
534-5.7.14 lriPK3myMm-dXkW3zK0-6XpO7BzI8hfRcByG1k7YiVzXlddTvs7QhjtgCWNcrzMBuPhoof
534-5.7.14 GjME2TgYzXJVHz5MV98nRnr_kq-kP7RmgOtX3IQHLwM5E8QGBC9-2THVQr_Ch_U0-1nZsc
534-5.7.14 yoPuNEw> Please log in via your web browser and then try again.
534-5.7.14 Learn more at
534 5.7.14 https://support.google.com/mail/bin/answer.py?answer=78754 wr6sm26888533wjc.24 - gsmtp

    at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:892)
    at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:814)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:728)
    at javax.mail.Service.connect(Service.java:364)
    at javax.mail.Service.connect(Service.java:245)
    at SendEmail.sendFromGMail(SendEmail.java:50)
    at SendEmail.main(SendEmail.java:18)
sent

This is my code

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class SendEmail {

    private static String USER_NAME = "me";
    private static String PASSWORD = "xyz";
    private static String RECIPIENT = "[email protected]";

    public static void main(String[] args) {
        String from = USER_NAME;
        String pass = PASSWORD;
        String[] to = { RECIPIENT };
        String subject = "Java send mail example";
        String body = "Welcome to JavaMail!";

        sendFromGMail(from, pass, to, subject, body);
        System.out.println("sent");
    }

    private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try {
            message.setFrom(new InternetAddress(from));
            InternetAddress[] toAddress = new InternetAddress[to.length];

            for( int i = 0; i < to.length; i++ ) {
                toAddress[i] = new InternetAddress(to[i]);
            }

            for( int i = 0; i < toAddress.length; i++) {
                message.addRecipient(Message.RecipientType.TO, toAddress[i]);
            }

            message.setSubject(subject);
            message.setText(body);
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        }
        catch (AddressException ae) {
            ae.printStackTrace();
        }
        catch (MessagingException me) {
            me.printStackTrace();
        }
    }
}

I had the same problem! Google prevents access for less secure apps.

This is how I solved it:

• Log in from your browser to that email account.
• Go to https://www.google.com/settings/security/lesssecureapps
• You will see Turn off or Turn on. Click on Turn on, then try your code again. It should work now.

1. Make sure Less secure apps is TURNED ON https://www.google.com/settings/security/lesssecureapps
2. Allow each app to send email Go to https://accounts.google.com/b/0/DisplayUnlockCaptcha and click on Continue.
   
3. This time: you can use your app to send email and all operations are allowed.

More links:
https://support.google.com/accounts/answer/6010255 https://productforums.google.com/forum/#!topic/gmail/9KCgzXY4G_c

1. allow less secure apps from your google account settings https://www.google.com/settings/security/lesssecureapps
2. open your gmail> goto settings > IMAP/POP settings > enable IMAP
3. goto this url and turn this on (completing all these steps will surely work) https://www.google.com/accounts/DisplayUnlockCaptcha

official guide for help

https://support.google.com/mail/answer/7126229?hl=en-GB&visit_id=637246238859828954-474780158&rd=2

I am also facing same problem.

Google does't give you direct open port access. If you are using your your google account for mail sending please Turn on the setting by clicking on this link. google go here : https://www.google.com/settings/security/lesssecureapps Best of luck hope it will work for you as well.