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
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+Before I flip my executors to virtual threads on Java 25, audit this class for: ThreadLocal usage, JNI calls or native frames that stay on the stack while blocking (these still pin the carrier), synchronized blocks around I/O (harmless on Java 24 and later, pinning on 21 to 23), and any code that assumes a bounded thread pool. Report risks with line numbers and a severity (blocking/warning/low).
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				`Before I flip my executors to virtual threads on Java 25, audit this class for: ThreadLocal usage, JNI calls or native frames that stay on the stack while blocking (these still pin the carrier), synchronized blocks around I/O (harmless on Java 24 and later, pinning on 21 to 23), and any code that assumes a bounded thread pool. Report risks with line numbers and a severity (blocking/warning/low).`