How does one use a RestClient within an Extension?

[akil-rails]

I need to create a Quarkus extension that includes a rest client - registered via @RegisterRestClient. I am following the tutorial in the docs

The rest client:

@RegisterRestClient(configKey = "rta-cams")
@RegisterClientHeaders(TokenClientHeader.class) 
@Path("restAuth/api/v1/getToken")
public interface TokenClient {
  @POST
  Uni<TokenResponse> getToken(TokenRequest request);
}

The buildstep

    @BuildStep
    AdditionalBeanBuildItem createTokenService() {
        return AdditionalBeanBuildItem                    
            .builder()
            .addBeanClass(TokenService.class)
            .addBeanClass(TokenMapper.class)
            .addBeanClass(TokenClient.class)
            .build();
    }

When I include the extension in the app, the build fails with the following error

Caused by: jakarta.enterprise.inject.UnsatisfiedResolutionException: Unsatisfied dependency for type com.apibanking.mf.services.core.runtime.infrastructure.remote.clients.token.TokenClient and qualifiers [@RestClient]
	- java member: com.apibanking.mf.services.core.runtime.application.services.TokenService#tokenClient
	- declared on CLASS bean [types=[java.lang.Object, com.apibanking.mf.services.core.runtime.application.services.TokenService], qualifiers=[@Default, @Any], target=com.apibanking.mf.services.core.runtime.application.services.TokenService]

The TokenService and TokenMapper are other classes, which are correctly discovered during the build of the app, but not the client class. What do i need to add to make sure that the RegisterRestClient annotations are correctly handled?

[akil-rails]

I tried using a custom builder, using QuarkusRestClientBuilder, but then the error shifts to the following

java.lang.IllegalArgumentException: Not a REST client interface: interface com.apibanking.mf.services.core.runtime.infrastructure.remote.clients.token.TokenRestClient. No @Path annotation found on the class or any methods of the interface and no HTTP method annotations (@POST, @PUT, @GET, @HEAD, @DELETE, etc) found on any of the methods

Struggling to figure out how to get a Rest Client work within a quarkus extension - would really appreciate any help!

[Pilpin]

Hello, I have the same question, did you find a way to make it work ?

[akil-rails]

Yes - pls see #34267

I added an empty beans.xml in the runtime module, and it worked

[dcdh]

You should not add a beans.xml inside the runtime module because all beans presents in the runtime module will be indexed even the one you may not want. Thus, it make the AdditionnalBeanBuildItem useless.

[mschorsch]

Use AdditionalIndexedClassesBuildItem instead of AdditionalBeanBuildItem.

    @BuildStep
    AdditionalIndexedClassesBuildItem addAdditionalClasses() {
        return AdditionalIndexedClassesBuildItem(TokenClient.class.getName());
    }