javamail authenticator not work

Question

here is my configuration to send a mail to my smtp server but it's not use session authenticator and force me to enter credential from console and when I enter them from console it successfully send mail, which part of my configuration is wrong.

        Properties properties = new Properties();
    //clear it later 

    properties.setProperty("mail.debug", "true");
    properties.put("mail.smtp.socketFactory.port", "587");
    properties.put("mail.smtp.auth", true);
    properties.put("mail.smtp.starttls.enable", "true");
    properties.put("mail.smtp.host", "mail.example.com");
    properties.put("mail.smtp.port", "587");

    properties.put("mail.smtp.host", "mail.example.com");
    properties.put("mail.smtp.sasl.enable","true");   
    properties.put("mail.smtp.sasl.mechanisms","GSSAPI");
    properties.put("mail.smtp.sasl.authorizationid","admin");
    properties.put("mail.smtp.sasl.realm","EXAMPLE.COM");

    System.setProperty( "sun.security.krb5.debug", "true");
    System.setProperty( "java.security.krb5.realm", "EXAMPLE.COM");
    System.setProperty( "java.security.krb5.kdc", "ipa.example.com"); 


    URL jaasConfigURL = this.getClass().getResource("jaas.conf");
    jaasConfigURL.getFile();
    String jaasConfigFile = jaasConfigURL.getFile();
    System.out.println(jaasConfigFile);
    System.setProperty( "java.security.auth.login.config", jaasConfigFile);
    System.setProperty( "javax.security.auth.useSubjectCredsOnly", "false");

    session = Session.getInstance(properties, new Authenticator() {
        @Override
        protected PasswordAuthentication getPasswordAuthentication(){
            return new PasswordAuthentication("admin", "password");
        }
     });
        session.setDebug(true);
    MimeMessage mime = new SMTPMessage(session);
    mime.setFrom(new InternetAddress(from));
    mime.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
    mime.setSubject("test");
    mime.setText("hello world!");
    Transport.send(mime);

and my jaas.conf file

krb5_initiate{
com.sun.security.auth.module.krb5LoginModule required
useTicketCache="true"
doNotPrompt="true"
debug="true";
};