Programmatically add route path in extension using build items results in ClassNotFoundException

[jfbenckhuijsen]

Hi,

I'm trying to programmatically add a path to the quarkus vertx setup using a build item (using NonApplicationRootPathBuildItem) using the code shown below. However, this code throws a ClassNotFoundException on a function lambda, I'm assuming it's the routFunction() lambda.

1. What is causing this. It seems Quarkus removes the lambda code from the -deployment build?
2. How to solve this?

 @BuildStep
    public void setupPush(BuildProducer<AdditionalBeanBuildItem> additionalBeans,
            BuildProducer<RouteBuildItem> additionalRoutes,
            NonApplicationRootPathBuildItem nonApplicationRootPathBuildItem,
            PubSubBuildTimeConfig config) {
        if (!config.push().enabled()) {
            return;
        }

        additionalBeans.produce(AdditionalBeanBuildItem
                .builder()
                .setUnremovable()
                .addBeanClasses(GooglePubSubAuthenticationFilter.class, PubSubPushManager.class, GoogleTokenVerifier.class)
                .build());

        config.push().endpointPath().ifPresent(endpoint -> additionalRoutes.produce(nonApplicationRootPathBuildItem
                .routeBuilder()
                .routeFunction(endpoint, (route) -> route.method(HttpMethod.POST) // <-- It seems this causes the ClassNotFoundException
                        .consumes("application/json")
                        .handler(BodyHandler.create())
                        .handler(new PubSubPushEndpointHandler()))
                .build()));

    }