* @throws IllegalArgumentException if the mapping name is not found or
* if there is no unique match
* @since 4.1
*/
public static MethodArgumentBuilder fromMappingName(String mappingName) {
RequestMappingInfoHandlerMapping handlerMapping = getRequestMappingInfoHandlerMapping();
List<HandlerMethod> handlerMethods = handlerMapping.getHandlerMethodsForMappingName(mappingName);
if (handlerMethods == null) {
throw new IllegalArgumentException("Mapping mappingName not found: " + mappingName);
}
if (handlerMethods.size() != 1) {
throw new IllegalArgumentException(