public class MailSender {
 
 	
 	protected Session mailSession;
 	
 	public void login(String smtpHost, String smtpPort, String username, String password) {
 		Properties props = new Properties();
 		props.put("mail.smtp.host", smtpHost);
 		props.put("mail.smtp.socketFactory.port", smtpPort);		// sichere Verbindung
 		props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");	// sichere Verbindung
 		props.put("mail.smtp.auth", "true");
 		props.put("mail.smtp.port", smtpPort);	// eigentlicher E-Mail austausch
 		
 		Authenticator auth = new Authenticator() {
 			@Override
 			protected PasswordAuthentication getPasswordAuthentication() {
 				
 				return new PasswordAuthentication(username, password);
 			}
 		};
 		
 		this.mailSession = Session.getDefaultInstance(props, auth);
 		Statusbar.outputSuccess("Loged in.");
 	}
 	
 	
 				//send(Sender@Mail.Adresse, SenderName, 	EmpfängerAdressen, 		Betreff,			 Message);
 	public void send(String senderMail, String senderName, String receiverAdresses, String subject, String message ) {
 //		throws MessagingException, IllegalStateException, UnsupportedEncodingException {
 		if(mailSession == null) {
 			throw new IllegalStateException("17 message- login failed");
 		}
 		
 		MimeMessage msg = new MimeMessage(mailSession);
 		try {
 			msg.addHeader("Content-type", "text/HTML; charset=UTF-8");
 
 		msg.addHeader("format", "flowed");
 		msg.addHeader("content-Transfer-Encoding", "8bit");
 		
 		msg.setFrom(new InternetAddress(senderMail, senderName)); 
 		msg.setReplyTo(InternetAddress.parse(senderMail, false)); // true standart E-Mail ohne umlaute und extrazeichen / strict false alle Adressen 
 		msg.setSubject(subject, "UTF-8");
 		msg.setText(message, "UTF-8");
 		msg.setSentDate(new Date());
 		
 		msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(receiverAdresses, false)); // angabe des Empfängers als Bcc CC oder to für normal
 		
 		Statusbar.outputSuccess("Send Mail...");
 		Transport.send(msg);	// versenden der Mail
 		Statusbar.outputSuccess("Mail sent.");
 		} catch (MessagingException | UnsupportedEncodingException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
 		}
 	}
 }
 

 public void onSendMailTrainAction(javax.faces.event.ActionEvent event) {
 		Statusbar.outputMessage("SendMail Class");
 		
 		try {
 		mailReceiver = m_txtMailReceiver;
 		message = "der test 17";
 		}catch(Exception e){
 			Statusbar.outputWarning("E-mail sending Error: "+ e);
 		}
 
 		String username = "Muster@gmail.com";		// Zugangsdaten codieren oder aus sicherem Zugang
 		String password = "******";					// Zugangsdaten codieren oder aus sicherem Zugang
 		String sendMail = "Muster@gmail.com";		//"Sender@Mail.Adresse"
 		
 				
 		try {
 		
 		MailSender sender = new MailSender();
 		
 		//MailSender2 sender = new MailSender2();
 			;
 		sender.login("smtp.gmail.com", "465", username, password);
 		
 //		try {
 			sender.send(sendMail, "AutoMail", mailReceiver, "Betreff 17 test", message);
 			
 			sender.send(
 					
 		} catch (IllegalStateException e) {
 			// TODO Auto-generated catch block
 			e.printStackTrace();
 			Statusbar.outputError("sendMail Error: " + e)
 
 		}
     	  	
     	
     };
 		}
     	  	
     	
     }
 

 Caused by: java.lang.ClassNotFoundException: javax.mail.Authenticator
                                               	at java.net.URLClassLoader.findClass(Unknown Source)
                                               	at java.lang.ClassLoader.loadClass(Unknown Source)
                                               	at java.lang.ClassLoader.loadClass(Unknown Source)
                                               	... 50 more