Java has an implementation of Futures, but it's not very good. In the JVM, however, we have Scala Futures, which IMO are far better than Javascript promises. An

Java has an implementation of Futures, but it's not very good. In the JVM, however, we have Scala Futures, which IMO are far better than Javascript promises. And on top, you have a lot more flexibility deciding how to run those futures, as far as threading goes, because they run on top of Java's very sturdy ExecutorService. There are a variety of executor services for pretty much anything you want. JVM concurrency is best in class. It's just the Java language itself that moves at a snail's pace.