Java logging example 2

example2.java

@RestController
public class Example2Controller {
    private static final Logger log = LoggerFactory.getLogger(Example2Controller.class);
    
    @GetMapping("/example2")
    public Mono<String> example2() {
        return doSomeStuff();
    }

    private Mono<String> doSomeStuff() {
        return
            Mono.just("Some data")
                .doOnEach(signal -> {
                    if (signal.isOnNext()) {
                        var requestId = (String) signal.getContextView().get("requestId");

                        log.info("This is request id: {}", requestId);
                    }
                });
    }
}