@Nullable
  private static String getGradleJarVersion(VirtualFile file) {
    final Matcher matcher = GradleInstallationManager.GRADLE_JAR_FILE_PATTERN.matcher(file.getName());
    if (matcher.matches()) {
      return matcher.group(2);
    }
    return null;
  }
@Nullable
  private static String getGradleJarVersion(VirtualFile file)