docs: protected <T> T processInjectionPoint(final Member injectionTarget, final Class<T> injectionType,
              final GrpcClient annotation) {
          final List<ClientInterceptor> interceptors = interceptorsFromAnnotation(annotation);
          final String name = annotation.value();
          final Channel channel;
          try {
              channel = getChannelFactory().createChannel(name, interceptors);
              if (channel == null) {
                  throw new IllegalStateException("Channel factory created a null channel for " + name);
              }
          } catch (final RuntimeException e) {
              throw new IllegalStateException("Failed to create channel: " + name, e);
          }
  
          final T value = valueForMember(name, injectionTarget, injectionType, channel);
          if (value == null) {
              throw new IllegalStateException(
                      "Injection value is null unexpectedly for " + name + " at " + injectionTarget);
          }
          return value;
      }