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 +1,83 @@
+$ javac --enable-preview --release 26 broken/MissingCatch.java     (26.0.2.1+1)
+exit=0
+
+$ javac broken/MissingCatch.java     (28-beta+21-ea)
+broken/MissingCatch.java:8: error: unreported exception ExecutionException; must be caught or declared to be thrown
+            scope.join();
+                      ^
+1 error
+exit=1
+
+$ javac --enable-preview --release 26 broken/OldFailedException.java     (26.0.2.1+1)
+exit=0
+
+$ javac broken/OldFailedException.java     (28-beta+21-ea)
+broken/OldFailedException.java:9: error: cannot find symbol
+        } catch (StructuredTaskScope.FailedException e) {
+                                    ^
+  symbol:   class FailedException
+  location: interface StructuredTaskScope
+1 error
+exit=1
+
+$ javac --enable-preview --release 26 broken/OldTimeoutException.java     (26.0.2.1+1)
+exit=0
+
+$ javac broken/OldTimeoutException.java     (28-beta+21-ea)
+broken/OldTimeoutException.java:11: error: cannot find symbol
+        } catch (StructuredTaskScope.TimeoutException e) {
+                                    ^
+  symbol:   class TimeoutException
+  location: interface StructuredTaskScope
+1 error
+exit=1
+
+$ javac --enable-preview --release 26 broken/AwaitAll.java     (26.0.2.1+1)
+exit=0
+
+$ javac broken/AwaitAll.java     (28-beta+21-ea)
+broken/AwaitAll.java:7: error: cannot find symbol
+        try (var scope = StructuredTaskScope.open(Joiner.<String>awaitAll())) {
+                                                        ^
+  symbol:   method <String>awaitAll()
+  location: interface Joiner
+1 error
+exit=1
+
+$ javac --enable-preview --release 26 broken/OldJoiner.java     (26.0.2.1+1)
+exit=0
+
+$ javac broken/OldJoiner.java     (28-beta+21-ea)
+broken/OldJoiner.java:7: error: wrong number of type arguments; required 3
+public class OldJoiner<T> implements Joiner<T, List<T>> {
+                                           ^
+1 error
+exit=1
+
+$ javac --enable-preview --release 26 broken/ShutdownOnFailure.java     (26.0.2.1+1)
+broken/ShutdownOnFailure.java:6: error: cannot find symbol
+        try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
+                                                ^
+  symbol:   class ShutdownOnFailure
+  location: interface StructuredTaskScope
+1 error
+exit=1
+
+$ javac broken/ShutdownOnFailure.java     (28-beta+21-ea)
+broken/ShutdownOnFailure.java:6: error: cannot find symbol
+        try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
+                                                ^
+  symbol:   class ShutdownOnFailure
+  location: interface StructuredTaskScope
+1 error
+exit=1
+
+# the same sources on JDK 25 for ShutdownOnFailure
+$ javac --enable-preview --release 25 broken/ShutdownOnFailure.java     (25.0.5+8-LTS)
+broken/ShutdownOnFailure.java:6: error: cannot find symbol
+        try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
+                                                ^
+  symbol:   class ShutdownOnFailure
+  location: interface StructuredTaskScope
+1 error
+exit=1