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

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
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+$ java --enable-preview StructuredDemo     (JDK 27)
+--- allSuccessfulOrThrow(): results as a List, failures as ExecutionException
+results = [price=42, stock=7]
+CHECK ok   : join() returns the subtask results in fork order
+caught java.util.concurrent.ExecutionException with cause java.lang.IllegalStateException: inventory service is down
+CHECK ok   : a failing subtask surfaces as ExecutionException(cause)
+--- allSuccessfulOrThrow(Function): join() throws the exception type you choose
+caught OrderFailed: order failed: inventory service is down
+CHECK ok   : the mapped exception wraps the original failure
+--- withTimeout(...): what happens when the scope runs out of time
+caught java.util.concurrent.ExecutionException
+   cause: java.util.concurrent.StructuredTaskScope$CancelledByTimeoutException
+CHECK ok   : a timeout is reported as CancelledByTimeoutException
+exit=0