code: public static <K, V> ConfigurationOptionBuilder<Map<K, V>> mapOption(ValueConverter<K> keyConverter, ValueConverter<V> valueConverter) {
  		return new ConfigurationOptionBuilder<Map<K, V>>(new MapValueConverter<K, V>(keyConverter, valueConverter), Map.class)
  				.defaultValue(Collections.<K, V>emptyMap());
  	}
docs: Constructs a {@link ConfigurationOptionBuilder} whose value is of type {@link Map}
  
  @return a {@link ConfigurationOptionBuilder} whose value is of type {@link Map}