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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/01-g1-default-1cpu-vs-2cpu.txt
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# JEP 523: which collector does the JVM pick when you do not choose one?
# Same class files, same vendor (Amazon Corretto), same 2 GB memory limit. Only the JDK version and the CPU limit change.
=== amazoncorretto:26 --cpus=1 --memory=2g
$ docker run --rm --cpus=1 --memory=2g amazoncorretto:26 java -cp /app GcReport
java.version = 26.0.2.1
availableCpus = 1
maxHeapMB = 511
collector beans = Copy, MarkSweepCompact
UseG1GC = false (origin DEFAULT)
UseSerialGC = true (origin ERGONOMIC)
UseParallelGC = false (origin DEFAULT)
=== amazoncorretto:27 --cpus=1 --memory=2g
$ docker run --rm --cpus=1 --memory=2g amazoncorretto:27 java -cp /app GcReport
java.version = 27
availableCpus = 1
maxHeapMB = 512
collector beans = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
UseG1GC = true (origin ERGONOMIC)
UseSerialGC = false (origin DEFAULT)
UseParallelGC = false (origin DEFAULT)
=== amazoncorretto:26 --cpus=2 --memory=2g
$ docker run --rm --cpus=2 --memory=2g amazoncorretto:26 java -cp /app GcReport
java.version = 26.0.2.1
availableCpus = 2
maxHeapMB = 512
collector beans = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
UseG1GC = true (origin ERGONOMIC)
UseSerialGC = false (origin DEFAULT)
UseParallelGC = false (origin DEFAULT)
=== amazoncorretto:27 --cpus=2 --memory=2g
$ docker run --rm --cpus=2 --memory=2g amazoncorretto:27 java -cp /app GcReport
java.version = 27
availableCpus = 2
maxHeapMB = 512
collector beans = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
UseG1GC = true (origin ERGONOMIC)
UseSerialGC = false (origin DEFAULT)
UseParallelGC = false (origin DEFAULT)