Spring MVC - DeferredResult Examples

@Controller
public class MyController {

    @GetMapping("test")
    @ResponseBody
    public DeferredResult<String> handleTestRequest() {

        log("handler started");
        final DeferredResult<String> deferredResult = new DeferredResult<>();

        new Thread(() -> {
            log("async task started");
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            log("async task finished");
            deferredResult.setResult("test async result");
        }).start();


        log("handler finished");
        return deferredResult;
    }

    private static void log(String msg) {
        System.out.println(
                LocalTime.now() +
                        " MyController [" +
                        Thread.currentThread().getName() + "] "
                        + msg);
    }
}