Feature Request : Ability to specify additional annotation as injecetion points

Hi Guys,

A few of the newer libraries are mixing and matching other annotations for injection points, such as MicroProfile Config, Whereby the @ConfigProperty(name = "test") is both a named, and an injection point.

I have overcome this through shading the guice-core library, and adding a very simple SPI Interface to InjectionPoint class,

static Annotation getAtInject(AnnotatedElement member) {
    Annotation a = member.getAnnotation(jakarta.inject.Inject.class);
    a = a == null ? member.getAnnotation(Inject.class) : a;
    //#GedMarc update to allow alternative injection pointers
    if(a == null) {
      List<Class<? extends Annotation>> annotations = new ArrayList<>();
      ServiceLoader<InjectionPointProvider> load = ServiceLoader.load(InjectionPointProvider.class);
      load.forEach(iPoint -> {
        annotations.add(iPoint.injectionPoint(member));
      });
      for (Class<? extends Annotation> annotation : annotations) {
          //noinspection ConstantValue
          if (a == null) {
         a= member.getAnnotation(annotation);
          if (a != null) {
            a = new Inject(){
              @Override
              public Class<? extends Annotation> annotationType() {
                return annotation;
              }
              @Override
              public boolean optional() {
                return member.isAnnotationPresent(Nullable.class);
              }
            };
            break;
          }
        }
      }
    }
    return a;
  }

While I am sure there is probably a much cleaner way to implement this functionality, this rather simple extension works perfectly so far across the spectrum (of my visibility)

Would it be possible to consider such an update to the Guice framework for enabling this modification of Injectables, to allow any custom annotation binding to be used as an injection point according to a client service provider?

This has been done in the GuicedEE framework, to enable MicroProfile and meet the TCK requirements,

Many thanks

google / guice

Feature Request : Ability to specify additional annotation as injecetion points #1813