code: public static ResourceBundle getBundle(String bundleName) throws MissingResourceException {
          ClassLoader classLoader = ClassLoader.getSystemClassLoader();
          if (classLoader == null) {
              classLoader = getLoader();
          }
          return getBundle(bundleName, Locale.getDefault(), classLoader);
      }
docs: Finds the named resource bundle for the default {@code Locale} and the caller's
  {@code ClassLoader}.
  
  @param bundleName
  the name of the {@code ResourceBundle}.
  @return the requested {@code ResourceBundle}.
  @throws MissingResourceException
  if the {@code ResourceBundle} cannot be found.