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Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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asmhatre
2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
commit f59c1de96d
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docs/output/31-tls-clienthello-size.txt
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# Size of the first TLS record (the ClientHello) each JDK sends
=== JDK 26
java.version = 26.0.2.1
record type = 0x16 (0x16 = handshake)
ClientHello record = 417 bytes (+5 byte record header)
fits one TCP segment = yes (1460-byte MSS on a 1500-byte MTU)
=== JDK 27
java.version = 27
record type = 0x16 (0x16 = handshake)
ClientHello record = 1573 bytes (+5 byte record header)
fits one TCP segment = NO (1460-byte MSS on a 1500-byte MTU)
=== JDK 27 with -Djdk.tls.namedGroups=x25519,secp256r1 (post-quantum group removed)
java.version = 27
record type = 0x16 (0x16 = handshake)
ClientHello record = 408 bytes (+5 byte record header)
fits one TCP segment = yes (1460-byte MSS on a 1500-byte MTU)