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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+import java.io.InputStream;
+import java.net.InetAddress;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import javax.net.ssl.SSLServerSocket;
+import javax.net.ssl.SSLServerSocketFactory;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.SSLSocketFactory;
+
+/**
+ * One end of a loopback TLS 1.3 handshake, so two different JDKs can be pointed at each other.
+ *
+ * <pre>
+ *   java TlsPeer server &lt;portfile&gt;   listen on an ephemeral port, write the port to a file, serve one handshake
+ *   java TlsPeer client &lt;port&gt;       connect and complete a handshake
+ * </pre>
+ *
+ * The scripts run both with -Djavax.net.debug=ssl:handshake and read the negotiated key-exchange group
+ * out of the debug log; no JDK API reports it directly. Explained in docs/04-post-quantum-tls.md.
+ */
+public class TlsPeer {
+
+    public static void main(String[] args) throws Exception {
+        if (args[0].equals("server")) {
+            SSLServerSocket server = (SSLServerSocket) SSLServerSocketFactory.getDefault()
+                    .createServerSocket(0, 1, InetAddress.getLoopbackAddress());
+            Files.writeString(Path.of(args[1]), Integer.toString(server.getLocalPort()));
+            try (SSLSocket socket = (SSLSocket) server.accept()) {
+                socket.startHandshake();
+                socket.getOutputStream().write('!');
+            }
+            server.close();
+        } else {
+            SSLSocket socket = (SSLSocket) SSLSocketFactory.getDefault()
+                    .createSocket(InetAddress.getLoopbackAddress(), Integer.parseInt(args[1]));
+            socket.startHandshake();
+            System.out.println("handshake complete: " + socket.getSession().getProtocol()
+                    + " " + socket.getSession().getCipherSuite());
+            InputStream in = socket.getInputStream();
+            in.read();
+            socket.close();
+        }
+    }
+}