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
commit f59c1de96d
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+# StructuredTaskScope (JEP 505 in 25). Fifth preview in 25, sixth in 26, seventh in 27.
+
+$ javac StructuredHub.java      (JDK 25, no flag)
+    <repo>/lanes/src/StructuredHub.java:1: error: StructuredTaskScope is a preview API and is disabled by default.
+    import java.util.concurrent.StructuredTaskScope;
+                               ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:15: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open()) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                      ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: Joiner is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                         ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    5 errors
+    exit=1
+$ javac --enable-preview --release 25 StructuredHub.java      (JDK 25)
+    exit=0
+$ java --enable-preview StructuredHub      (JDK 25)
+    java.version = 25.0.4.1
+    CHECK ok   : fan-out: both results joined: Dashboard[user=user-7, order=order-for-7]
+    CHECK ok   : anySuccessfulResultOrThrow(): the first result wins and the slow subtask is cancelled
+
+$ javac StructuredHub.java      (JDK 26, no flag)
+    <repo>/lanes/src/StructuredHub.java:1: error: StructuredTaskScope is a preview API and is disabled by default.
+    import java.util.concurrent.StructuredTaskScope;
+                               ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:15: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open()) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                      ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: Joiner is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                         ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: cannot find symbol
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                                ^
+      symbol:   method <String>anySuccessfulResultOrThrow()
+      location: interface Joiner
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    6 errors
+    exit=1
+$ javac --enable-preview --release 26 StructuredHub.java      (JDK 26)
+    <repo>/lanes/src/StructuredHub.java:24: error: cannot find symbol
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                                ^
+      symbol:   method <String>anySuccessfulResultOrThrow()
+      location: interface Joiner
+    1 error
+    exit=1
+
+$ javac StructuredHub.java      (JDK 27, no flag)
+    <repo>/lanes/src/StructuredHub.java:1: error: StructuredTaskScope is a preview API and is disabled by default.
+    import java.util.concurrent.StructuredTaskScope;
+                               ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:15: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open()) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                      ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: Joiner is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                         ^
+      (use --enable-preview to enable preview APIs)
+    <repo>/lanes/src/StructuredHub.java:24: error: cannot find symbol
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                                ^
+      symbol:   method <String>anySuccessfulResultOrThrow()
+      location: interface Joiner
+    <repo>/lanes/src/StructuredHub.java:24: error: StructuredTaskScope is a preview API and is disabled by default.
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                             ^
+      (use --enable-preview to enable preview APIs)
+    6 errors
+    exit=1
+$ javac --enable-preview --release 27 StructuredHub.java      (JDK 27)
+    <repo>/lanes/src/StructuredHub.java:24: error: cannot find symbol
+            try (var scope = StructuredTaskScope.open(StructuredTaskScope.Joiner.<String>anySuccessfulResultOrThrow())) {
+                                                                                ^
+      symbol:   method <String>anySuccessfulResultOrThrow()
+      location: interface Joiner
+    1 error
+    exit=1
+
+$ javac --enable-preview --release 26 StructuredHubNew.java      (JDK 26)
+    exit=0
+$ java --enable-preview StructuredHubNew      (JDK 26)
+    java.version = 26.0.2.1
+    CHECK ok   : anySuccessfulOrThrow(): the first result wins
+
+$ javac --enable-preview --release 27 StructuredHubNew.java      (JDK 27)
+    exit=0
+$ java --enable-preview StructuredHubNew      (JDK 27)
+    java.version = 27
+    CHECK ok   : anySuccessfulOrThrow(): the first result wins