Quarkus - how to use OpenAPI generated API as Quarkus rest client?

I have YAML definition from another project which will generate an ExternalAPI.java for me. I am using OpenAPI plugin of Maven.

Now, I also can do @RestClient in Quarkus, defining @RegisterRestClient(configKey="foo") and enable injection; also, @RegisterClientHeaders to inject some header.

Now, how to combine both? I want to keep using the annotations I mentioned, while making use of the generated API class.

Now, I am using RestClientBuilder:

RestClientBuilder.newBuilder()
        .baseUri(new URI(someUrl))
        .register((ClientRequestFilter) context -> context.getHeaders().put("MyToken", Collections.singletonList(token)))
        .build(ExternalAPI.class);

Usable, but little bit strange; I need to create the instance myself.

you can create an interface that extends the generated ExternalAPI interface and annotate it with @RegisterRestClient and @RegisterClientHeaders

@RegisterRestClient(configKey="foo")
@RegisterClientHeaders(MyHeadersFactory.class)
public interface MyExternalAPI extends ExternalAPI {
// define something
}

and now inject it in any service

public class MyService {
    @Inject
    MyExternalAPI externalAPI;

    public void doSomething() {
        // use the externalAPI instance
    }
}

Now you can use the annotations you mentioned and make use of the generated API class. Quarkus will handle the instantiation of MyExternalAPI for you.