@SuppressWarnings("UseOfSystemOutOrSystemErr")
  private static void addPath(List<? super File> list, String path) {
    File file = new File(path);
    if (file.exists()) {
      list.add(file);
    }
    else {
      System.out.println("warn: missing '" + path + "', ignored");
    }
  }
@SuppressWarnings("UseOfSystemOutOrSystemErr")
  private static void addPath(List<? super File> list, String path)