How to resolve javax.mail.AuthenticationFailedException issue?

Question

I am doing a `sendMail` `Servlet` with `JavaMail`. I have `javax.mail.AuthenticationFailedException` on my output. Can anyone please help me out? Thanks. sendMailServlet code: ``` try { String host = "smtp.gmail.com"; String from = "my@gmail.com"; String pass = "pass"; Properties props = System.getProperties(); 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"); props.put("mail.debug", "true"); Session session = Session.getDefaultInstance(props, null); MimeMessage message = new MimeMessage(session); Address fromAddress = new InternetAddress(from); Address toAddress = new InternetAddress("test1@gmail.com"); message.setFrom(fromAddress); message.setRecipient(Message.RecipientType.TO, toAddress); message.setSubject("Testing JavaMail"); message.setText("Welcome to JavaMail"); Transport transport = session.getTrans…

Accepted Answer

You need to implement a custom `Authenticator`

```
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

class GMailAuthenticator extends Authenticator {
     String user;
     String pw;
     public GMailAuthenticator (String username, String password)
     {
        super();
        this.user = username;
        this.pw = password;
     }
    public PasswordAuthentication getPasswordAuthentication()
    {
       return new PasswordAuthentication(user, pw);
    }
}
```

Now use it in the `Session`

```
Session session = Session.getInstance(props, new GMailAuthenticator(username, password));
```

Also check out the JavaMail FAQ

How to resolve javax.mail.AuthenticationFailedException issue?

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