Comment by hocuspocus

> Java 21 was just released and frameworks had no meaningful support for virtual threads whatsoever.

Spring was ready on day 1, as virtual threads had been an experimental feature since Java 19. Spring Boot added support within a couple months.

> In my experience, most companies using Java are chronically multiple versions behind (e.g. some of my friends still in the Java world are on 11).

And that's on you.