krbOptions);
DynamicConfiguration dynConf =
new DynamicConfiguration(new AppConfigurationEntry[]{ ace });
LoginContext login = newLoginContext(
HadoopConfiguration.USER_KERBEROS_CONFIG_NAME, null, dynConf);
login.login();
Subject loginSubject = login.getSubject();
Set<Principal> loginPrincipals = loginSubject.getPrincipals();
if (loginPrincipals.isEmpty()) {
throw new RuntimeException("No login principals found!");