code: public static CloudResourceBundleControl getInstance(ServiceAccount serviceAccount,
              long cacheExpiration) {
          return getInstance(serviceAccount, cacheExpiration, null, null);
      }
docs: Create an instance of <code>CloudResourceBundleControl</code> with the specified
  service account and the cache expiration.
  <p>
  This method is equivalent to
  <code>getInstance(serviceAccount, cacheExpiration, null, null, null)</code>.
  
  @param serviceAccount    The service account.
  @param cacheExpiration   The cache expiration, see the method description for details.
  @return  An instance of CloudResourceBundleControl.
  @throws IllegalArgumentException when <code>serviceAccount</code> is null or <code>cacheExpiration</code>
  value is illegal.
  @see #getInstance(ServiceAccount, long, String, String, NameMapper)