code: public void reinitialize ()
    {
      m_aRWLock.writeLocked (m_aCountries::clear);
  
      for (final Locale aLocale : LocaleCache.getInstance ().getAllLocales ())
      {
        final String sCountry = aLocale.getCountry ();
        if (StringHelper.hasText (sCountry))
          addCountry (sCountry);
      }
  
      if (LOGGER.isDebugEnabled ())
        LOGGER.debug ("Reinitialized " + CountryCache.class.getName ());
    }
docs: Reset the cache to the initial state.