code: public RestHandlerExceptionResolverBuilder addErrorMessageHandler(
              Class<? extends Exception> exceptionClass, HttpStatus status) {
  
          return addHandler(new ErrorMessageRestExceptionHandler<>(exceptionClass, status));
      }
docs: Registers {@link ErrorMessageRestExceptionHandler} for the specified exception type.
  This handler will be also used for all the exception subtypes, when no more specific mapping
  is found.
  
  @param exceptionClass The exception type to handle.
  @param status The HTTP status to map the specified exception to.