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Title: Structured concurrency | java.evolved

Open Graph Title: Structured concurrency | java.evolved

X Title: Structured concurrency | java.evolved

Description: Manage concurrent task lifetimes as a single unit of work.

Open Graph Description: Manage concurrent task lifetimes as a single unit of work.

X Description: Manage concurrent task lifetimes as a single unit of work.

Opengraph URL: https://javaevolved.github.io/concurrency/structured-concurrency.html

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Domain: javaevolved.github.io

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←https://javaevolved.github.io/concurrency/virtual-threads.html
→https://javaevolved.github.io/concurrency/scoped-values.html
Homehttps://javaevolved.github.io/
Concurrencyhttps://javaevolved.github.io/#concurrency
🐛 Report a code issuehttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Structured%20concurrency&category=concurrency&slug=structured-concurrency
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Structured Concurrency (JEP 499) ↗https://openjdk.org/jeps/499
StructuredTaskScope ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/concurrent/StructuredTaskScope.html
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/concurrency/StructuredConcurrency.java
Concurrency Beginner Virtual threads Java 8 Thread thread = new Thread(() -> { System.out.println("hello"); }); thread.start(); thread.join(); Java 21+ Thread.startVirtualThread(() -> { IO.println("hello"); }).join(); Hover to see modern ➜ JDK 21+ → https://javaevolved.github.io/concurrency/virtual-threads.html
Concurrency Advanced Scoped values Java 8 static final ThreadLocal CURRENT = new ThreadLocal<>(); void handle(Request req) { CURRENT.set(authenticate(req)); try { process(); } finally { CURRENT.remove(); } } Java 25 static final ScopedValue CURRENT = ScopedValue.newInstance(); void handle(Request req) { ScopedValue.where(CURRENT, authenticate(req) ).run(this::process); } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/concurrency/scoped-values.html
Concurrency Advanced Stable values Java 8 private volatile Logger logger; Logger getLogger() { if (logger == null) { synchronized (this) { if (logger == null) logger = createLogger(); } } return logger; } Java 25 (Preview) private final StableValue logger = StableValue.of(this::createLogger); Logger getLogger() { return logger.get(); } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/concurrency/stable-values.html
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