Most of the world uses Java, including "happening" companies. Please be highly aware of HN bias. If one only reads HN, one can get a highly distorted view of the reality of software engineering.
> Most of the world uses Java, including "happening" companies.
On the contrary, even boring enterprises often don't actively use Java. Sure, lots of places do, but lots of places have either never adopted or dropped (or at least relegated to certain legacy systems) Java, especially, on the enterprise side, places that at some point became largely Microsoft shops, where even if they've since moved beyond that, they probably didn't go back to Java except maybe for any Android work.
I guess you are in a different bubble. Netflix's backend is mostly all Java, Apple Backend (apple media products engineering) is Java based. Neither of these companies will ever become a Microsoft shop.
On the contrary, even boring enterprises often don't actively use Java. Sure, lots of places do, but lots of places have either never adopted or dropped (or at least relegated to certain legacy systems) Java, especially, on the enterprise side, places that at some point became largely Microsoft shops, where even if they've since moved beyond that, they probably didn't go back to Java except maybe for any Android work.