no default constructor for io.dapr.client.domain.CloudEvent

[beiwei30]

Expected Behavior

A default constructor of CloudEvent is helpful for unmarshalling the payload to the exact type automatically in a Spring MVC application, for example:

@RestController
public class MqBindingController {

    @Autowired
    @Qualifier("jsonDaprClient")
    private DaprClient daprClient;

    @GetMapping("/dapr/subscribe")
    public Flux<Subscription> subscribe() {
        Subscription[] subscriptions = new Subscription[]{
                new Subscription("pubsub", "BEIWEI_TEST_TOPIC_A", "A"),
                new Subscription("pubsub", "BEIWEI_TEST_TOPIC_B", "B"),
        };
        return Flux.fromArray(subscriptions);
    }

    @PostMapping("/A")
    public ResponseEntity<HttpStatus> topicA(@RequestBody byte[] payload) {
        ...
    }

    @PostMapping("/B")
    public ResponseEntity<HttpStatus> topicB(@RequestBody CloudEvent payload) { // this doesn't work
        ... 
    }
   ...
}

Spring complains no default constructor is present for CloudEvent.

Actual Behavior

    @PostMapping("/B")
    public ResponseEntity<HttpStatus> topicB(@RequestBody CloudEvent payload) {

    }

I believe this applies to all classes under io.dapr.client.domain.

Steps to Reproduce the Problem

Release Note

RELEASE NOTE: REFACTORED CloudEvent serialization, also adding default constructor.

[mukundansundar]

Hi @beiwei30 thanks for raising this issue. Will you be able to work on this?

[arghya88]

@mukundansundar I see all the fields are final and hence just adding a default constructor is not going to work. What do you suggest we should do?