[traderj0e]

Java is different. Tomcat's thread pool is the older way. A lot of newer stuff was using something promises-related instead with an event loop. But then recently Java added virtual threads which should obviate the need for that, similar to Go. Rust considered virtual threads but chose against that because it requires a more abstracted runtime like Java and Go have. Great preso on this https://www.youtube.com/watch?v=lJ3NC-R3gSI

All the "async" stuff is super poorly named. They mean cooperative multitasking, or I guess "async within a single kernel thread." Yeah multiple kernel threads are asynchronous but "async" doesn't mean that :S