Unable to retrive a JSON request body as Byte[] or String in Graalvm build

[prashantcodecraft]

Expected Behavior

We are creating an endpoint where we need to receive raw String / byte[] verify signature () and then convert it into JSON. This whole process works find on normal instance but fails when running on GRAALVM build.

@Post
    @Secured("isAnonymous()")
    public Mono<HttpResponse<?>> webhook(HttpRequest<?> request, @Body Publisher<byte[]> body) {
        System.out.println("Inside registration webhook call.");
        Flux<byte[]> byteFlux = Flux.from(body);
        Mono<String> bodyMono = byteFlux.reduce("", (s1, s2) -> s1 + new String(s2));

        return bodyMono.publishOn(Schedulers.boundedElastic()).map(bodyString -> {
            try {
                Stripe.apiKey = stripeApiKey;
                String endpointSecret = stripeWebhookSecret;
                String sigHeader = request.getHeaders().get("Stripe-Signature");
                if (sigHeader == null || endpointSecret == null || bodyString == null) {
                    System.out.println("⚠️  Invalid signatures of incoming webhook.");
                    return HttpResponse.status(HttpStatus.BAD_REQUEST);
                }
                System.out.println("⚠️ Webhook Secret being used : " + endpointSecret);
                // Verify signatures for incoming webhook
                if (!verifySignature(endpointSecret, sigHeader, bodyString)) {
                    return HttpResponse.badRequest().body("Invalid signature");
                }

                com.marvin.model.stripe.Event event = jsonMapper.readValue(bodyString, Argument.of(com.marvin.model.stripe.Event.class));
                System.out.println("event details raw " + event.getData().getObject());
                ObjectMapper objectMapper = new ObjectMapper();
                objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
                objectMapper.configure(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS, true);
                objectMapper.setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE);
                System.out.println("EVENT TYPE" + event.getType());
                switch (event.getType()) {
                   ..............
                }
                return HttpResponse.status(HttpStatus.OK);
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println("⚠️  Webhook error " + e.getMessage());
                return HttpResponse.status(HttpStatus.BAD_REQUEST);
            }
        });

Actual Behaviour

The fails on micronaut graalvm AWS lambda build with following error

08:54:55.087 [main] ERROR i.m.http.server.RouteExecutor - Unexpected error occurred: Error decoding JSON stream for type [T]: Cannot deserialize value of type `byte` from Object value (token `JsonToken.START_OBJECT`)

at [Source: (byte[])"{

Steps To Reproduce

No response

Environment Information

• Ubuntu
• JDK 11

Example Application

No response

Version

3.9.5

[yawkat]

Please make a reproducer, this is not enough info to figure it out. Also please test on micronaut 4