谢天谢地，我可以用Java AKKA和接待员提出通用和优雅的解决方案！！

private <T> CompletableFuture<ActorRef<T>> findActor(ActorSystem<Void> system, ServiceKey<T> actorKey) {
    ActorRef<Command> receptionist = system.receptionist();
    Duration askTimeout = Duration.ofSeconds(3);
    CompletionStage<Listing> result = AskPattern.ask(
            receptionist,
            replyTo -> Receptionist.find(actorKey, replyTo),
            askTimeout,
            system.scheduler());

    return result.toCompletableFuture().thenApplyAsync(
            (reply) -> {
                if (reply != null && reply instanceof Listing) {
                    return reply.getServiceInstances(actorKey).stream().findFirst().get();
                }
                return null;
            }).exceptionally((Throwable ex) -> {
                return null;
            });
}

它看起来像这样（如果Java很糟糕，请道歉）：

// TargetActor.Command is just a placeholder
ActorSystem<Void> system;
ServiceKey<TargetActor.Command> key;

CompletionStage<Receptionist.Listing> result =
    AskPattern.ask(
        system.receptionist(),
        replyTo -> Receptionist.find(key, replyTo),
        Duration.ofSeconds(10),  // ask will fail if no reply received in this time
        system.scheduler()
    );

然后，您可以使用常用的CompletionStage方法（例如whenComplete和friends）来提取Receptionist.Listing并采取适当的操作。

下面是Akka与参与者系统之外的参与者进行交互的文档。
Java有一个选项卡。
https://doc.akka.io/docs/akka/current/typed/interaction-patterns.html#request-response-with-ask-from-outside-an-actor