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
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2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
commit f59c1de96d
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# Who talks to whom: the key-exchange group each pairing actually negotiates (TLS 1.3, loopback)
=== client JDK 26 -> server JDK 26
client offered : "named groups": [x25519, secp256r1, secp384r1, secp521r1, x448, ffdhe2048, ffdhe3072, ffdhe4096, ffdhe6144, ffdhe8192]
server selected: x25519
handshake complete: TLSv1.3 TLS_AES_256_GCM_SHA384
=== client JDK 27 -> server JDK 27
client offered : "named groups": [X25519MLKEM768, x25519, secp256r1, secp384r1, secp521r1, x448, ffdhe2048, ffdhe3072, ffdhe4096]
server selected: X25519MLKEM768
handshake complete: TLSv1.3 TLS_AES_256_GCM_SHA384
=== client JDK 27 -> server JDK 26
client offered : "named groups": [X25519MLKEM768, x25519, secp256r1, secp384r1, secp521r1, x448, ffdhe2048, ffdhe3072, ffdhe4096]
server selected: x25519
handshake complete: TLSv1.3 TLS_AES_256_GCM_SHA384
=== client JDK 26 -> server JDK 27
client offered : "named groups": [x25519, secp256r1, secp384r1, secp521r1, x448, ffdhe2048, ffdhe3072, ffdhe4096, ffdhe6144, ffdhe8192]
server selected: x25519
handshake complete: TLSv1.3 TLS_AES_256_GCM_SHA384