For others who are interested in fast JS in Java, we've been working on a embedding V8 into clojure using JNA. A working prototype that's good enough for us is

For others who are interested in fast JS in Java, we've been working on a embedding V8 into clojure using JNA. A working prototype that's good enough for us is at https://github.com/circleci/clj-v8 https://github.com/circleci/clj-v8. I'm using it to port dieter (clojure asset pipeline we to serve https://circleci.com https://circleci.com [https://github.com/edgecase/dieter https://github.com/edgecase/dieter ]) from Rhino to Dieter. Our current 100s asset compiles are unbearable, and are only about 4s with V8.