public class EmailConnector {


    public static Session sessionCreate() {
        final String fromEmail = ConfigurationManager.getInstance().getProperty(EmailConfig.SENDER_EMAIL.toString());

        final String password = ConfigurationManager.getInstance().getProperty(EmailConfig.SENDER_PASSWORD.toString());

        Properties props = new Properties();
        props.put("mail.smtp.host", ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_HOST.toString()));

        props.put("mail.smtp.socketFactory.port",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SSL_PORT.toString()));

        props.put("mail.smtp.socketFactory.class",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SSL_FACTORY_CLASS.toString()));

        props.put("mail.smtp.auth",
                ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_AUTHENTICATION.toString()));

        props.put("mail.smtp.port", ConfigurationManager.getInstance().getProperty(EmailConfig.SMTP_PORT.toString()));

        Authenticator auth = new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(fromEmail, password);
            }
        };
        return Session.getDefaultInstance(props, auth);
    }
}

#Email send configuration
SENDER_EMAIL = codegenalerts@gmail.com
SENDER_PASSWORD = cgalert321
SMTP_HOST = smtp.gmail.com
SSL_PORT = 465
SMTP_AUTHENTICATION = true
SMTP_PORT = 465
SSL_FACTORY_CLASS = javax.net.ssl.SSLSocketFactory

public class GroupEmail {

    public void sendEmail() throws IOException {
        String recipient = "nirmala@codegen.net";

        Session session = EmailConnector.sessionCreate();
        /* subject of email */
        String emailSubject = "CG_Alert";
        try {
            MimeMessage msg = new MimeMessage(session);
            msg.addHeader("Content-type", "text/HTML; charset=UTF-8");
            msg.addHeader("format", "flowed");
            msg.addHeader("Content-Transfer-Encoding", "8bit");

            msg.setFrom(new InternetAddress("codegenalerts@gmail.com", "CodeGen Alerts"));

            msg.setReplyTo(InternetAddress.parse("codegenalerts@gmail.com"));

            msg.setSubject(emailSubject, "UTF-8");

            msg.setSentDate(new Date());
            /* buyer email address */
            msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient));

            /* Create the message body part */
            msg.setText("A new Test-Alert from CG_Alerts");

            /* Send message */
            Transport.send(msg, "codegenalerts@gmail.com", "cgalert321");

        } catch (MessagingException | UnsupportedEncodingException e) {
            SystemLogger.logErrorMessege(this, e);
        }
    }

}

GroupEmail groupEmail = new GroupEmail();
        groupEmail.sendEmail();

98656 [http-nio-8080-exec-9] ERROR it.codegen.rnd.cgalert.notification.template.email.GroupEmail  - Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.SocketException: Permission denied: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2100)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:699)
    at javax.mail.Service.connect(Service.java:388)
    at javax.mail.Service.connect(Service.java:246)
    at javax.mail.Service.connect(Service.java:195)
    at javax.mail.Transport.send0(Transport.java:254)
    at javax.mail.Transport.send(Transport.java:124)
..more