SampleController.java

@PostMapping(path = REQUEST_PATH_JASMINE, produces = APPLICATION_JSON_VALUE)
public ResponseEntity<?> jasmine(@RequestParam(HONEST_JASMINE_AJAX_PARAMETER) Optional<String> sample) throws InterruptedException {

    var maybeEmptySample = sample.map(s -> s.isEmpty()? null : s);

    LOGGER.info("Looking for {}", maybeEmptySample);

    TimeUnit.SECONDS.sleep(2);

    return ok(new Object() {

        String message = "Pois é! Você estava procurando por " + maybeEmptySample.orElse("NADA") + " de fato!";

        public String getMessage() {

            return message;
        }
    });
}