code: public static synchronized void reloadExistingConfigurations() {
  		if (LOG.isDebugEnabled()) {
  			LOG.debug("Reloading " + REGISTRY.keySet().size()
  					+ " existing configurations");
  		}
  		for (Configuration conf : REGISTRY.keySet()) {
  			conf.reloadConfiguration();
  		}
  	}
docs: Reload existing configuration instances.