docs: @Override
      public Collection<URL> getURLs() {
          try {
              // As a container URL, the URL must end with a trailing slash.
              URL entryUrl = rootContainer.createEntryUri( getRelativePath() + "/" ).toURL();
              return Collections.singleton(entryUrl);
          } catch ( MalformedURLException e ) {
              // FFDC
              return Collections.emptyList();
          }
      }