try {
            Properties props = new Properties();
            props.put("mail.smtp.host", "smtp.gmail.com");
            props.put("mail.smtp.socketFactory.port", "465");
            props.put("mail.smtp.socketFactory.class",
                    "javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.port", "465");

            Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("xxx@gmail.com","********");
                    }
                });

            // Define message

            MimeMessage message = new MimeMessage(session);
            message.addHeaderLine("method=REQUEST");
            message.addHeaderLine("charset=UTF-8");
            message.addHeaderLine("component=VEVENT");


            message.setFrom(new InternetAddress("ahmed107@gmail.com"));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress("ahmed_aswani@rayacorp.com"));
            message.setSubject("QF-meeting");

            StringBuffer sb = new StringBuffer();

            StringBuffer buffer = sb.append("BEGIN:VCALENDAR\n"+
            "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"+
            "VERSION:2.0\n" +
            "METHOD:REQUEST\n" +
            "BEGIN:VEVENT\n" +
 "ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:xxxx@xxxx.com\n" +
            "ORGANIZER:MAILTO:xxxx@gmail.com\n" +
            "DTSTART:20140409T053000Z\n" +
            "DTEND:20140409T060000Z\n" +
            "LOCATION:Conference room\n" +
            "TRANSP:OPAQUE\n" +
            "SEQUENCE:0\n" +
 "UID:040000008200E00074C5B7101A82E00800000000002FF466CE3AC5010000000000000000100\n" +
            " 000004377FE5C37984842BF9440448399EB02\n" +
            "DTSTAMP:20140409T120102Z\n" +
            "CATEGORIES:Meeting\n" +
            "DESCRIPTION:wee need to meet urgntly.\n\n" +
            "SUMMARY:Test meeting request\n" +
            "PRIORITY:5\n" +
            "CLASS:PUBLIC\n" +
            "BEGIN:VALARM\n" +
            "TRIGGER:PT1440M\n" +
            "ACTION:DISPLAY\n" +
            "DESCRIPTION:Reminder\n" +
            "END:VALARM\n" +
            "END:VEVENT\n" +
            "END:VCALENDAR");

            // Create the message part
            BodyPart messageBodyPart = new MimeBodyPart();

            // Fill the message
            messageBodyPart.setHeader("Content-Class", "urn:content-classes:calendarmessage");
 messageBodyPart.setHeader("Content-ID","calendar_message");
            messageBodyPart.setDataHandler(new DataHandler(
            new ByteArrayDataSource(buffer.toString(), "text/calendar")));//very important


            // Create a Multipart
            Multipart multipart = new MimeMultipart();

            // Add part one
            multipart.addBodyPart(messageBodyPart);



            // Put parts in message
            message.setContent(multipart);

            // send message
            Transport.send(message);

        } catch (MessagingException me) {
            me.printStackTrace();
        } catch (Exception ex) {
            ex.printStackTrace();
        }