Add structured-concurrency-final module: StructuredTaskScope final in JDK 28 (JEP 543), run on 28-ea, 27, 26 and 25

Runnable demos for the ankurm.com structured-concurrency-java article: the ExecutorService thread leak and its fix, every built-in Joiner, structure violations, timeouts, a custom Joiner, JSON thread dumps (in-process and jcmd), scoped values, javap diffs of the API on 25, 26, 27 and 28-ea, compiler output for six pieces of 25/26-era code, and the preview class-file trap between 27 and 28. Transcripts in output/. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
2026-10-26 02:01:31 +00:00
parent 2e25042a68
commit c93a1fffbb
37 changed files with 1351 additions and 0 deletions
@@ -0,0 +1,15 @@
+import java.time.Duration;
+import java.util.concurrent.StructuredTaskScope;
+
+/** The JDK 25/26 timeout exception. In 27 the scope throws ExecutionException with a CancelledByTimeoutException cause. */
+public class OldTimeoutException {
+    public static void main(String[] args) throws Exception {
+        try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>awaitAllSuccessfulOrThrow(),
+                cf -> cf.withTimeout(Duration.ofMillis(50)))) {
+            scope.fork(() -> { Thread.sleep(1000); return "late"; });
+            scope.join();
+        } catch (StructuredTaskScope.TimeoutException e) {
+            System.out.println("timed out");
+        }
+    }
+}