private static String requireNonNull(String required,String message) throws ConfigurationRuntimeException {
  if (required == null)   throw new ConfigurationRuntimeException(message);
  return required;
}

private static String requireNonNull ( String required , String message ) throws ConfigurationRuntimeException { if ( required == null ) throw new ConfigurationRuntimeException ( message ) ; return required ; }
throw exception for un - configured required values .
