private static @NotNull PersistentHashMap<String, Long> initRecentFilesTimestampMap(@NotNull Project project) {
    Path file = ProjectUtil.getProjectCachePath(project, "recentFilesTimeStamps.dat");
    try {
      return IOUtil.openCleanOrResetBroken(() -> createMap(file), file);
    }
    catch (IOException e) {
      LOG.error("Cannot create PersistentHashMap in " + file, e);
      throw new RuntimeException(e);
    }
  }
private static @NotNull PersistentHashMap<String, Long> initRecentFilesTimestampMap(@NotNull Project project)