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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+Act as a Java 25 to Java 27 upgrade reviewer. Scan the attached project for: reflection that writes to final fields (Field.setAccessible followed by Field.set on a final field; Java 26 warns, JEP 500), StructuredTaskScope code that uses the 25 names (Joiner.anySuccessfulResultOrThrow became anySuccessfulOrThrow in 26, and Joiner gained a third type parameter in 27), the -XX:-ZGenerational flag (ignored with a warning on 24 and 25, rejected on 26 and 27), Thread.stop and java.applet (removed in 26), JOL or Unsafe code that assumes a 12-byte object header (compact headers are the default in 27), and container start scripts that rely on the JVM choosing SerialGC in a one-CPU container (G1 is the default everywhere in 27). For each finding give the file, the line, the release that changed it, and the fix.
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				Act as a Java 25 to Java 27 upgrade reviewer. Scan the attached project for: reflection that writes to final fields (Field.setAccessible followed by Field.set on a final field; Java 26 warns, JEP 500), StructuredTaskScope code that uses the 25 names (Joiner.anySuccessfulResultOrThrow became anySuccessfulOrThrow in 26, and Joiner gained a third type parameter in 27), the -XX:-ZGenerational flag (ignored with a warning on 24 and 25, rejected on 26 and 27), Thread.stop and java.applet (removed in 26), JOL or Unsafe code that assumes a 12-byte object header (compact headers are the default in 27), and container start scripts that rely on the JVM choosing SerialGC in a one-CPU container (G1 is the default everywhere in 27). For each finding give the file, the line, the release that changed it, and the fix.