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Title: Concurrent HTTP with virtual threads | java.evolved

Open Graph Title: Concurrent HTTP with virtual threads | java.evolved

X Title: Concurrent HTTP with virtual threads | java.evolved

Description: Fetch many URLs concurrently with virtual threads and HttpClient.

Open Graph Description: Fetch many URLs concurrently with virtual threads and HttpClient.

X Description: Fetch many URLs concurrently with virtual threads and HttpClient.

Opengraph URL: https://javaevolved.github.io/concurrency/concurrent-http-virtual.html

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Domain: javaevolved.github.io

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Virtual Threads (JEP 444) ↗https://openjdk.org/jeps/444
HttpClient ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.net.http/java/net/http/HttpClient.html
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/concurrency/ConcurrentHttpVirtual.java
Concurrency Advanced Structured concurrency Java 8 ExecutorService exec = Executors.newFixedThreadPool(2); Future u = exec.submit(this::fetchUser); Future o = exec.submit(this::fetchOrder); try { return combine(u.get(), o.get()); } finally { exec.shutdown(); } Java 25 (Preview) try (var scope = new StructuredTaskScope .ShutdownOnFailure()) { var u = scope.fork(this::fetchUser); var o = scope.fork(this::fetchOrder); scope.join().throwIfFailed(); return combine(u.get(), o.get()); } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/concurrency/structured-concurrency.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
Concurrency Advanced Lock-free lazy initialization Java 8 class Config { private static volatile Config inst; static Config get() { if (inst == null) { synchronized (Config.class) { if (inst == null) inst = load(); } } return inst; } } Java 25 (Preview) class Config { private static final StableValue INST = StableValue.of(Config::load); static Config get() { return INST.get(); } } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/concurrency/lock-free-lazy-init.html
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