Structured Concurrency in Java 21: What It Fixes and Why It Exists
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Note This series uses the Java 21 preview API for structured concurrency (StructuredTaskScope, JEP 453). The API evolved in later previews. See Part 9 for Java 21 -> Java 25 migration guidance. Compile and run with --enable-preview. Originally published on engnotes.dev: Introduction to Structured Concurrency in Java 21 This is a shortened version with the same core code and takeaways. The annoying part of concurrent request code is usually not starting work in parallel. Java has had plent