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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
commit f59c1de96d
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jep-tour/src/broken/StructuredScope26.java
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import java.util.List;
import java.util.concurrent.StructuredTaskScope;
import java.util.concurrent.StructuredTaskScope.Joiner;
/**
* JDK 26 code for the structured concurrency preview. It compiles on 26 and fails on 27:
* StructuredTaskScope gained a third type parameter (the exception join() throws), and
* FailedException / TimeoutException no longer exist. Driven by scripts/broken-on-27.sh.
*/
public class StructuredScope26 {
public static void main(String[] args) throws Exception {
try (StructuredTaskScope<String, List<String>> scope =
StructuredTaskScope.open(Joiner.<String>allSuccessfulOrThrow())) {
scope.fork(() -> "price=42");
List<String> results = scope.join();
System.out.println(results);
} catch (StructuredTaskScope.FailedException e) {
System.out.println("a subtask failed: " + e.getCause());
} catch (StructuredTaskScope.TimeoutException e) {
System.out.println("timed out");
}
}
}