code: @Override
      @Secured("ROLE_TEST")
      public void sayHello(final HelloRequest req, final StreamObserver<HelloReply> responseObserver) {
          final HelloReply reply = HelloReply.newBuilder().setMessage("Hello ==> " + req.getName()).build();
          responseObserver.onNext(reply);
          responseObserver.onCompleted();
      }
docs: A grpc method that requests the user to be authenticated and have the role "ROLE_GREET".