Java hasn't had significant stop-the-world pauses for a few years now. ZGC, the new low-latency collector, has <1ms pauses for heaps up to at least 4 TB. As to

Java hasn't had significant stop-the-world pauses for a few years now. ZGC, the new low-latency collector, has <1ms pauses for heaps up to at least 4 TB. As to shared mutable state, virtual threads are completely orthogonal to that. You can write code with shared state or without, or, if you want language guarantees, you can use languages that greatly limit it, like Clojure. I would love to see a new implementation of Erlang for the Java platform.