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Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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asmhatre
2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
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lanes/prompts/features-6-structured-concurrency.txt
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Refactor this CompletableFuture.allOf pipeline to use StructuredTaskScope. Note that StructuredTaskScope is still a preview API in Java 25, 26 and 27, so the build needs --enable-preview and the code must use the factory-method names of the JDK it targets (Joiner.anySuccessfulResultOrThrow() on 25, anySuccessfulOrThrow() on 26 and 27). Preserve error propagation semantics and show what happens on cancellation. Explain the difference from the original CompletableFuture approach.