Java Email send email from Gmail

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class Main {

   private static String USER_NAME = "*****"; // GMail user name (just the part before "@gmail.com")
   private static String PASSWORD = "********"; // GMail password
   private static String RECIPIENT = "bill@example.com";

   public static void main(String[] args) {
      String from = USER_NAME;//www.  j a  va 2s  . c  om
      String pass = PASSWORD;
      String[] to = { RECIPIENT }; // list of recipient email addresses
      String subject = "Java send mail example";
      String body = "Welcome to JavaMail !";

      sendFromGMail(from, pass, to, subject, body);
   }

   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];

         // To get the array of addresses
         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();
      }
   }
}