}


    public static Subject getInitiatorSubject ( String userName, String password, String realm, Long expire ) throws Exception {
        KerberosPrincipal principal = new KerberosPrincipal(String.format("%s@%s", userName, realm), KerberosPrincipal.KRB_NT_PRINCIPAL);
        return getInitiatorSubject(principal, password, expire);
    }

    public final class RefreshableKerb5Authenticator extends Kerb5Authenticator {

            Set<Principal> pr = this.getSubject().getPrincipals();
            for ( Iterator<Principal> ite = pr.iterator(); ite.hasNext(); ) {
                try {
                    KerberosPrincipal entry = (KerberosPrincipal) ite.next();
                    return entry.getRealm();
                }
                catch ( Exception e ) {
                    continue;
                }
            }
        }

        try {
            Files.write(p, keyTab);
            KeyTab kt = KeyTab.getInstance(p.toFile());
            KerberosKey[] keys = kt.getKeys(new KerberosPrincipal("cifs/******@****.***FIELD", KerberosPrincipal.KRB_NT_PRINCIPAL));
            KerberosToken tok = new KerberosToken(krbToken, keys);

            KerberosEncData ed = tok.getTicket().getEncData();