Re: "Java has had all of the same async capabilities for many, many years, but nobody uses them" That's exaggeration. Lots of Java libraries use async and con

Re: "Java has had all of the same async capabilities for many, many years, but nobody uses them" That's exaggeration. Lots of Java libraries use async and concurrency. Java 7 has NIO.2 which is easy to use. There is also Netty; many projects build upon that. I'm not here to say Java's ecosystem is richer or better; I'm just saying exaggeration is not useful. Re: "the vast majority of the java ecosystem" I don't mean to sound dismissive, but lots of languages have code you probably don't want to use based on your preferences or needs. So? Don't use the vast majority of libraries. :) You probably don't anyway. UPDATE: See also Akka and Clojure's concurrency for useful, popular approaches for the JVM.