Consume Map in multipart form

[pgoergler]

Expected Behavior

Deserialize multipart list in POJO.

2022-03-01 18:17:05,847 > Got: Request[messages={0=Hello world, 1=Hola todos}]
2022-03-01 18:17:05,849 > Got: [{0=Hello world, 1=Hola todos}]

Actual Behaviour

Lists are not deserialized:

2022-03-01 18:17:05,847 > Got: Request[messages=null]
2022-03-01 18:17:05,849 > Got: null

Steps To Reproduce

1. With HttpController:

@Controller("/messages")
public class MessageController {
    static final Logger LOGGER = LoggerFactory.getLogger(MessageController.class);

    @Post(produces = MediaType.APPLICATION_JSON, consumes = {MediaType.APPLICATION_FORM_URLENCODED, MediaType.MULTIPART_FORM_DATA})
    public HttpResponse<Response> index(@Body Request request) {
        LOGGER.info("Got: {}", request);
        LOGGER.info("Got: {}", request.messages() != null ? List.of(request.messages()) : null);
        return HttpResponse.ok(new Response(false));
    }

    private record Request(
            Map<String, String> messages
    ) {}

    private record Response(
            Boolean success
    ) {}
}

2. With Curl

curl --request POST \
  --url http://localhost/messages \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data 'messages[0]=Hello world' \
  --data 'messages[1]=Hola todos'

3. The logs are:

2022-03-01 18:17:05,847 > Got: Request[messages=null] 
2022-03-01 18:17:05,849 > Got: null 

Environment Information

• openjdk-16.0.2

Example Application

No response

Version

3.3.3

[ojebari-ma]

Can you please confirm that this is still an issue in the latest version of Micronaut?