code: public static Path currentDataDirectory()
    {
      RootDirectorySystem rootService = getCurrent();
      
      if (rootService == null)
        throw new IllegalStateException(L.l("{0} must be active for getCurrentDataDirectory().",
                                            RootDirectorySystem.class.getSimpleName()));
      
      return rootService.dataDirectory();
    }
docs: Returns the data directory for current active directory service.