### Relevant Articles: - [Why wait() Requires Synchronization?](https://www.baeldung.com/java-wait-necessary-synchronization) - [Working with Exceptions in Java CompletableFuture](https://www.baeldung.com/java-exceptions-completablefuture) - [CountDownLatch vs. Semaphore](https://www.baeldung.com/java-countdownlatch-vs-semaphore) - [Callbacks in ListenableFuture and CompletableFuture](https://www.baeldung.com/java-callbacks-listenablefuture-completablefuture)