Java Mail...! Experts U have some work here

Question

I am trying send mail from gmail account using the code below.
I have add mail.jar to my classpath, now the problem is my code
is successfully compiled, but generates a runtime error as below.
Any Experts.............??
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.io.*;
public class SendMailUsingAuthentication
private static final String SMTP_HOST_NAME = "smtp.gmail.com";
private static final String SMTP_AUTH_USER = "sss.sankar";
private static final String SMTP_AUTH_PWD = "*****";
private static final String emailMsgTxt = "Online Order ";
private static final String emailSubjectTxt = "Order Confirmation";
private static final String emailFromAddress = "[email protected]";
private static final String[] emailList = {"[email protected]"};
public static void main(String args[]) throws Exception
SendMailUsingAuthentication smtpMailSender = new SendMailUsingAuthentication();
smtpMailSender.postMail( emailList, emailSubjectTxt, emailMsgTxt,emailFromAddress);
System.out.println("Sucessfully Sent mail to All Users");
public void postMail( String recipients[ ], String subject,String message , String from) throws MessagingException
boolean debug = false;
Properties props = new Properties();
props.put("mail.smtp.host", SMTP_HOST_NAME);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable","true");
Authenticator auth = new SMTPAuthenticator();
Session session = Session.getDefaultInstance(props, auth);
session.setDebug(debug);
Message msg = new MimeMessage(session);
InternetAddress addressFrom = new InternetAddress(from);
msg.setFrom(addressFrom);
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
addressTo[i] = new InternetAddress(recipients);
msg.setRecipients(Message.RecipientType.TO, addressTo);
msg.setSubject(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
private class SMTPAuthenticator extends javax.mail.Authenticator
public PasswordAuthentication getPasswordAuthentication()
String username = SMTP_AUTH_USER;
String password = SMTP_AUTH_PWD;
return new PasswordAuthentication(username, password);
Error
=====
deps-jar:
Compiling 1 source file to C:\Documents and Settings\promise main\My Documents\NetBeansProjects\sankardemo\build\classes
compile-single:
run-single:
Exception in thread "main" javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com;
nested exception is:
java.net.UnknownHostException: smtp.gmail.com
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1389)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
at javax.mail.Service.connect(Service.java:310)
at javax.mail.Service.connect(Service.java:169)
at javax.mail.Service.connect(Service.java:118)
at javax.mail.Transport.send0(Transport.java:188)
at javax.mail.Transport.send(Transport.java:118)
at SendMailUsingAuthentication.postMail(SendMailUsingAuthentication.java:52)
at SendMailUsingAuthentication.main(SendMailUsingAuthentication.java:20)
Caused by: java.net.UnknownHostException: smtp.gmail.com
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:233)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1359)
... 8 more
Java Result: 1
BUILD SUCCESSFUL (total time: 3 seconds)

Answer 1

MSSL wrote:
ya guy i understand that, but any idea about how to correct the same.Give it an smtp host that is reachable.
My guess is that you'll need to go through a proxy server, since I can rech that host just fine.
Or perhaps your DNS is boned.