@Override
 public String getShortName() throws IOException {
   return kerberosName.getShortName();
 }
 @Override
 public String getHostName() {
   return kerberosName.getHostName();
 }
 @Override
 public String getRealm() {
   return kerberosName.getRealm();
 }
 @Override
 public String getServiceName() {
   return kerberosName.getServiceName();
 }