The compact overview of JDK 21’s “frozen” feature list

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Medium

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Conc

While virtual threads will be stable in Java 21, Structured Concurrency is still a preview feature. You probably won't see it in production anytime soon. Preview features require a special flag when compiling and running them, and they won't run on newer versions of the JVM. I don't expect to see StructuredTaskScope in common production use before the next LTS version is out. But it doesn't mean you cannot have structured concurrency before that. Even in language that mostly enforce Structured Concurrency like Kotlin, it's still a library feature. Even the original blog post which formulated this concept, described a library that implemented structured concurrency for Python[1]. You can pretty easily implement structured concurrency yourself by creating your own implementation of StructuredTaskScope, if you need it right now. You can even structured concurrency in C#[2] or Go[3]. [1] https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/ [2] https://github.com/StephenCleary/StructuredConcurrency.

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