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 15:00:40 +00:00
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+/**
+ * "JNI warnings on stderr by default": JEP 472 (Java 24). Loading a native library is a restricted operation.
+ * The library is the JDK's own libnet, so no compiler or extra file is needed. Run with and without
+ * --enable-native-access=ALL-UNNAMED by scripts/lanes.sh.
+ * Chapter: docs/14-lanes-21-to-25.md
+ */
+public class JniWarning {
+    public static void main(String[] args) {
+        System.out.println("java.version = " + System.getProperty("java.version"));
+        System.loadLibrary("net");
+        System.out.println("System.loadLibrary(\"net\") returned");
+    }
+}