code: public void updateProperties(ResourceBundle bundle, Properties props, Charset charset) {
  
  		Enumeration<String> keys = bundle.getKeys();
  
  		while (keys.hasMoreElements()) {
  			String key = keys.nextElement();
  
  			if (matchesFilter(key)) {
  				String value = bundle.getString(key);
  				props.put(key, value);
  			}
  		}
  	}
docs: Loads the message resource bundles specified and uses a
  BundleStringJasonifier to generate the properties.
  
  @param bundle
  the bundle
  @param props
  the properties
  @param charset
  the charset