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Add jdk28-preview module: JDK 28 early-access build, value classes, strict init flag, PEM, JSON incubator

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Gth99spB1CzQmBFofXmU4Z
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Claude
2026-09-28 08:48:04 +00:00
parent 57a04dc393
commit c8ff3acf09
15 changed files with 221 additions and 0 deletions
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jdk28-preview/output/02-forgot-the-preview-flag.txt
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# 02-forgot-the-preview-flag
--- javac ValueClasses.java (no --enable-preview):
src/ValueClasses.java:3: error: value classes are a preview feature and are disabled by default.
value record Point(int x, int y) {}
^
(use --enable-preview to enable value classes)
--- java ValueClasses (compiled with the flag, run without):
Error: LinkageError occurred while loading main class ValueClasses
java.lang.UnsupportedClassVersionError: Preview features are not enabled for ValueClasses (class file version 72.65535). Try running with '--enable-preview'