throws CacheException {
if (log.isDebugEnabled()) {
log.debug("Building natural id cache region [" + regionName + "]");
}
AdvancedCache cache = getCache(regionName, NATURAL_ID_KEY, properties);
NaturalIdRegionImpl region = new NaturalIdRegionImpl(
cache, regionName, metadata, this);
startRegion(region, regionName);
return region;
}