JavaMail异常javax.mail.AuthenticationFailedException 534-5.7.9需要特定于应用程序的密码

我想使用JavaMailAPI发送邮件

我已经完成了一些编码，但无法正常工作，抛出异常：-

消息发送失败javax.mail.AuthenticationFailedException：534-5.7.9需要特定于应用程序的密码。

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(
                            "[email protected]", "xxxx");
                }
            });
    try {
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("[email protected]"));
        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();
    } 

}

}

我在服务器控制台上遇到异常

消息发送失败Failedjavax.mail.AuthenticationFailedException：534-5.7.9需要特定于应用程序的密码。

要了解更多信息，请访问534 5.7.9 http://support.google.com/accounts/bin/answer.py?answer=185833 o5sm11464195pdr.50-gsmtp

任何人都可以帮我解决这个问题。