Question

I am using the following code for sending e-mail (gmail) using Java program. I am getting the AuthenticationFailedException. I mentioned the error below. How to solve this? How to use sender username ,password in this program ?

        package internet;

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

        public class mail
        {
           public static void main(String [] args)
           {


              String to = "[e-mail]";
              String from = "[e-mail]";


              String host = "smtp.gmail.com";


              Properties properties = System.getProperties();


              properties.put("mail.smtp.host", "smtp.gmail.com");
              properties.put("mail.smtp.port", "587");
              properties.put("mail.smtp.auth", "true");
              properties.put("mail.smtp.starttls.enable", "true");



              Session session = Session.getDefaultInstance(properties);

              try{

                 MimeMessage message = new MimeMessage(session);


                 message.setFrom(new InternetAddress(from));


                 message.addRecipient(Message.RecipientType.TO,
                                          new InternetAddress(to));


                 message.setSubject("This is the Subject Line!");


                 message.setText("This is actual message");


                 Transport.send(message);
                 System.out.println("hi");
                 System.out.println("Sent message successfully....");
              }catch (MessagingException mex) {
                 mex.printStackTrace();
              }
           }
        }

I have get the following error

    javax.mail.AuthenticationFailedException
            at javax.mail.Service.connect(Service.java:267)
            at javax.mail.Service.connect(Service.java:137)
            at javax.mail.Service.connect(Service.java:86)
            at javax.mail.Transport.send0(Transport.java:150)
            at javax.mail.Transport.send(Transport.java:80)
            at internet.mail.main(mail.java:59)

Answer 1

You have to provide your login credentials with t.connect(host, user, password) prior to t.sendMessage(message, addresses). (Aquire a Transport object first with Transport t = session.getTransport("smtp").