It seems there is no way of using the RestEasy MicroProfileRestClient(Builder)#build(serviceInterfaceClazz) while using collections in the interface.

public interface MyService extends Closeable {
    @GET
    @Path("/collection")
    List<String> collection();
}

MyService client = builder.build(MyService.class);
List<String> result = client.collection();

Gives the exception: RESTEASY003145: Unable to find a MessageBodyReader of content-type application/json and type interface java.util.List

Wrapping the service interfaces return value in GenericType returns, of course, the GenericType as a result. So how to do it?