code: private static void warn(Object scope, String propertyPath)
    {
      if(scope == null) {
        log.warn("Null object scope while searching for property |%s|.", propertyPath);
      }
      else {
        log.warn("Null value for |%s#%s|.", scope.getClass(), propertyPath);
      }
    }
docs: Record warning message to class logger.
  
  @param scope scope object,
  @param propertyPath object property path.