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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/91-final-field-mutation-27.txt
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# Reflection writing to a final field on JDK 27: same behaviour as 26 (compare 70-final-field-mutation.txt)
=== JDK 27, defaults
WARNING: Final field port in class FinalFieldMutation$Config has been mutated reflectively by class FinalFieldMutation in unnamed module @<hash> (file:<repo>/build/lanes/ffm27/)
WARNING: Use --enable-final-field-mutation=ALL-UNNAMED to avoid a warning
WARNING: Mutating final fields will be blocked in a future release unless final field mutation is enabled
field reads : 9090
port() returns : 8080
=== JDK 27, --illegal-final-field-mutation=deny
setInt refused : class FinalFieldMutation (in unnamed module @<hash>) cannot set final field FinalFieldMutation$Config.port (in unnamed module @<hash>), unnamed module @<hash> is not allowed to mutate final fields