@Nullable
  public static File getGlobalMavenSettingsXml() {
    String mavenHome = resolveMavenHomeDirectory();
    if (mavenHome == null) {
      return null;
    }
    return new File(mavenHome + File.separator + CONF_DIR, SETTINGS_XML);
  }
@Nullable
  public static File getGlobalMavenSettingsXml()