code: public static void acceptsUrlMultiple(OptionParser parser) {
          parser.acceptsAll(Arrays.asList(OPT_U, OPT_URL), "coordinator bootstrap urls")
                .withRequiredArg()
                .describedAs("url-list")
                .withValuesSeparatedBy(',')
                .ofType(String.class);
      }
docs: Adds OPT_U | OPT_URL option to OptionParser, with multiple arguments.
  
  @param parser OptionParser to be modified
  @param required Tells if this option is required or optional