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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+# The opt-out still works on 27: an explicit choice always wins over the JVM's.
+
+=== amazoncorretto:27  --cpus=1 --memory=2g   -XX:+UseSerialGC
+$ docker run --rm --cpus=1 --memory=2g amazoncorretto:27 java -XX:+UseSerialGC -cp /app GcReport
+java.version      = 27
+availableCpus     = 1
+maxHeapMB         = 511
+collector beans   = Copy, MarkSweepCompact
+UseG1GC           = false (origin DEFAULT)
+UseSerialGC       = true  (origin VM_CREATION)
+UseParallelGC     = false (origin DEFAULT)