code: public static String readResource(String path)
      {
          Class<?> callerClass = resolveCaller();
          if (callerClass == null)
          {
              return null;
          }
  
          return readResource(resolveCaller(), path);
      }
docs: Return target file's content from resource's path.<br>
  Resource is used caller class.
  
  @param path resource's path
  @return read result