JavaMail Exception javax.mail.AuthenticationFailedException 534-5.7.9 Application-specific password required

I want to send mail using JavaMailAPI

I have done some coding but it is not working throwing Exception:-

Message Sending Failedjavax.mail.AuthenticationFailedException: 534-5.7.9 Application-specific password required.

package com.appreciationcard.service;

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import com.appreciationcard.dao.DAOFactory;
import com.appreciationcard.forms.ComposeForm;

public class MailServiceImpl implements MailService {

public boolean mailsent(ComposeForm composeForm) {
    String to = composeForm.getTo();
    String from = composeForm.getFrom();
    String cc = composeForm.getCc();
    String bcc = composeForm.getBcc();
    String subject = composeForm.getSubject();
    String messages = composeForm.getMessage();
    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", true);
    props.put("mail.smtp.port", "587");
    props.put("mail.transport.protocol", "smtp");
    props.put("mail.debug", "true");
    System.out.println("Properties" + props);
    Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(
                            "tosudhansusekhar@gmail.com", "xxxx");
                }
            });
    try {
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("dynamicmihir@gmail.com"));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(
                to));
        message.setSubject(subject);
        message.setText(messages);
        Transport.send(message);
    } catch (MessagingException mex) {
        System.out.println("Message Sending Failed" + mex);
        mex.printStackTrace();
    } 

}

}

I am getting Exception on server console

Message Sending Failedjavax.mail.AuthenticationFailedException: 534-5.7.9 Application-specific password required.

Learn more at 534 5.7.9 http://support.google.com/accounts/bin/answer.py?answer=185833 o5sm11464195pdr.50 - gsmtp

Will Any one Kindly Help me out to solve this problem.

You have enabled Two phase authentication for your Google account and as a result applications will not be able to login to your Google account using the actual password. Google expects you to generate a application specific password for each application you use (and give it a name) and then use that password to login to your Google account from your application. This allows you to not give your password to third party application when you have 2-step authentication enabled.

The alternate way is for your application to support redirecting to a Google page to authenticate using username and password and code generated by the Google Authenticator app.

The link clearly explains what to do.