// We only scan each file once independent of the classloader that file might be
          // associated with.
          if (scannedUris.add(path.getCanonicalFile())) {
            scan(path, scannedUris, builder);
          }
        }
        scanJarFile(jarFile, builder);
      } finally {
        try {
          jarFile.close();

    assertThat(file.getParentFile()).isNull();
    assertThat(file.getCanonicalFile().getParentFile()).isNull();
    Files.createParentDirs(file);
  }

  public void testCreateParentDirs_relativePath() throws IOException {
    File file = file("nonexistent.file");
    assertThat(file.getParentFile()).isNull();
    assertThat(file.getCanonicalFile().getParentFile()).isNotNull();
    Files.createParentDirs(file);
  }

   *     directories of the specified file could not be created.
   * @since 4.0
   */
  public static void createParentDirs(File file) throws IOException {
    checkNotNull(file);
    File parent = file.getCanonicalFile().getParentFile();
    if (parent == null) {
      /*
       * The given directory is a filesystem root. All zero of its ancestors exist. This doesn't