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
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+# Opting out on JDK 27: a client that does not offer the hybrid group
+
+=== client JDK 27 with -Djdk.tls.namedGroups=x25519,secp256r1  ->  server JDK 27
+client offered : "named groups": [x25519, secp256r1]
+server selected: x25519
+handshake complete: TLSv1.3 TLS_AES_256_GCM_SHA384