V3 FluentBuilder validation failed when an operation references a component message

[Foorcee]

I tried this:

I tried to build an AsyncAPI v3 document using the FluentBuilder API where an operation references a message.

Minimal reproducible example (reduced from the README):

[Fact]
public void Validate_FluentBuilder_Should_Valid()
{
    var channelParameterSchema = new JsonSchemaBuilder().FromType<V2LicenseDefinition>();
    var builder = ServiceProvider.GetRequiredService<IV3AsyncApiDocumentBuilder>();
    var doc = builder
        .WithTitle("Cloud Event API")
        .WithVersion("1.0.0")
        .WithServer("StreetLightsApi", server => server
            .WithHost("https://streetlights.fake.com")
            .WithProtocol(AsyncApiProtocol.Http, "2.0")
            .WithBinding(new HttpServerBindingDefinition()))
        .WithChannel("events", channel => channel
            .WithServer("#/servers/StreetLightsApi")
            .WithDescription("The endpoint used to publish and subscribe to cloud events")
            .WithBinding(new HttpChannelBindingDefinition())
            .WithMessage("lightMeasuredEvent", definitionBuilder => { }))
        .WithOperation("observeCloudEvents", operation => operation
            .WithAction(V3OperationAction.Send)
            .WithChannel("#/channels/events")
            .WithTitle("ObserveCloudEvents")
            .WithDescription("Observes cloud events published by the StreetLightsApi")
            .WithBinding(new HttpOperationBindingDefinition
            {
                Method = HttpMethod.POST,
                Type = HttpBindingOperationType.Response
            })
            .WithMessage("#/components/messages/lightMeasuredEvent"))
        .WithMessageComponent("lightMeasuredEvent", message => message
            .WithName("LightMeasuredEvent")
            .WithDescription("The event fired whenever the luminosity of a light has been measured")
            .WithContentType("application/json"))
        .Build();
}

This happened:

Build() throws a FluentValidation.ValidationException:

Validation failed:
 -- Operations.Values[0].Messages[0]:
    The operation must reference a message defined by the channel it belongs to

I expected this:

No response

Is there a workaround?

No response

Anything else?

Root cause analysis:

• V3OperationMessageValidator enforces that operation messages must reference channel messages only
• During validation, DereferenceChannelMessage(...) is called with a reference like
  #/components/messages/lightMeasuredEvent
• This method explicitly rejects non-channel references and throws an InvalidDataException, which causes the validator to fail

Platform(s)

Windows

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