DateTime Input causing exceptions when direct invoking.

[kingkong-AI]

Describe the bug

When direct invoking the reserve method, we input values, we get the mentioned exception trace. This does not happen during a postman call. It seems to be occuring by how the direct invoke input is being captured:

Controller Method:

@RestController
public class MockConcertController {

    private final Random random = new Random();

    @PostMapping("integration/splitter/concert/reserve")
    public Flux<ConcertReservationResponse> reserve(@RequestBody Flux<ConcertReservationRequest> requestFlux) {
        return requestFlux.flatMap(request -> {
            int randomPrice = calculateRandomPrice(request.getSlot());
            ConcertReservationResponse response = ConcertReservationResponse.create(
                    UUID.randomUUID(),
                    request.getCity(),
                    request.getSlot(),
                    request.getCategory(),
                    randomPrice
            );
            return Mono.just(response);
        });
    }

    private int calculateRandomPrice(LocalDateTime slot) {
        // Add randomness
        int basePrice = 100;
        int variation = random.nextInt(50);
        return basePrice + variation;
    }
}

Request Object

@Data
@ToString
@NoArgsConstructor
@AllArgsConstructor(staticName = "create")
public class ConcertReservationRequest {

    private String city;
    private LocalDateTime slot;
    private String category;
}

Response Object:

@Data
@ToString
@NoArgsConstructor
@AllArgsConstructor(staticName = "create")
public class ConcertReservationResponse {

    private UUID reservationId;
    private String city;
    private LocalDateTime slot;
    private String category;
    private Integer price;

}

Exception Trace:

Caused by: Cannot invoke "reactor.core.publisher.Flux.flatMap(java.util.function.Function)" because "requestFlux" is null
    at org.unlogged.springwebfluxdemo.integrationpatterns.splitter.externalservices.MockConcertController.reserve(MockConcertController.java:22)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:568)
    at io.unlogged.AgentCommandExecutorImpl.lambda$executeCommandRaw$0(AgentCommandExecutorImpl.java:346)
    at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:45)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4512)
    at reactor.core.publisher.Mono.subscribeWith(Mono.java:4578)
    at reactor.core.publisher.Mono.subscribe(Mono.java:4339)
    at io.unlogged.AgentCommandExecutorImpl.executeCommandRaw(AgentCommandExecutorImpl.java:379)
    at io.unlogged.AgentCommandExecutorImpl.executeCommand(AgentCommandExecutorImpl.java:477)
    at io.unlogged.command.AgentCommandServer.serve(AgentCommandServer.java:74)
    at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:945)
    at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:192)
    at java.lang.Thread.run(Thread.java:840)

Reproduction steps

1. Direct invoke the given controller. method.
2. You will receive an exception.
3. With postman everything works fine
   ...

Expected behavior

Correct Expected json output as received in postman:

[
    {
        "reservationId": "4da54fb5-79f7-473d-b240-4f4f342ad9a3",
        "city": "Los Angeles",
        "slot": [
            2024,
            6,
            20,
            19,
            0
        ],
        "category": "Rock",
        "price": 128
    }
]

Additional context

No response