Overall, Kotlin’s concurrency support is impressive and well thought out. It’s not hard to understand why the language is a popular alternative to Java.

Java historically has dealt with this problem partly through a powerful concurrency API and thread pooling. Now Java developers are abuzz about virtual threads, a feature introduced in Java 21. Java ...

Java Threads, Second Edition, Scott Oaks and Henry Wong (O’Reilly) Concurrent Programming in Java, Second Edition, Doug Lea (Addison-Wesley) Taming Java Threads, Allen Holub (Apress) ...

JDK 21's virtual threads are a major leap forward for Java's concurrency model. Previously, Java relied on OS threads, which were resource-heavy, limiting how many threads could run concurrently.