In reply to Mark above, I believe it could be changed to a fat arrow call, to keep scope to the calling class/object. (async () => {})(); Allowing you to access any object/class fields from within the method.

I found a really good write up on a persons experience with Java vs other standard web languages. https://www.quora.com/Why-is-Java-NOT-used-for-web-front-end-rather-than-PHP-Python-Ruby-etc-in-sites-like-Facebook-Quora-Twitter