public static Set<String> loadSignatureList(@NotNull URL resource) {
    try (BufferedReader reader = new BufferedReader(new InputStreamReader(resource.openStream(), StandardCharsets.UTF_8))) {
      return new HashSet<>(FileUtil.loadLines(reader));
    }
    catch (IOException ex) {
      Logger.getInstance(LanguageLevelUtil.class).warn("cannot load: " + resource.getFile(), ex);
      return Collections.emptySet();
    }
  }
public static Set<String> loadSignatureList(@NotNull URL resource)