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.

Structured concurrency is a match for virtual threads, which is a lightweight implementation of threads provided by the JDK. A preview of virtual threads is planned for Java 19 this September.

Java’s thread model makes it a strong contender among concurrent languages, but multithreading has always been inherently tricky. Structured concurrency allows you to use multiple threads with ...