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Add lazy-constants module: LazyConstant (JEP 531) against the holder idiom and double-checked locking

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Basics, failure semantics on 26 vs 27, lazy collections, API across 25/26/27, preview-flag traps and a JMH read-path benchmark (jars fetched and sha1-checked, not committed).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 12:27:27 +00:00
parent af44e59e7f
commit 814c32b5ce
25 changed files with 606 additions and 0 deletions
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lazy-constants/output/03-failures.txt
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$ javac --enable-preview --release 26 src/Failures.java && java --enable-preview Failures (26.0.2.1+1)
get #1: java.lang.IllegalStateException: boom | cause=null | supplier calls=1
get #2: java.lang.IllegalStateException: boom | cause=null | supplier calls=2
get #3: java.lang.IllegalStateException: boom | cause=null | supplier calls=3
null result: java.lang.NullPointerException | cause=null
recursion: java.lang.IllegalStateException: Recursive invocation of a LazyConstant's computing function: Failures$$Lambda | cause=null
$ javac --enable-preview --release 27 src/Failures.java && java --enable-preview Failures (27+35)
get #1: java.util.NoSuchElementException: Unable to access the constant because java.lang.IllegalStateException was thrown at initial computation | cause=java.lang.IllegalStateException: boom | supplier calls=1
get #2: java.util.NoSuchElementException: Unable to access the constant because java.lang.IllegalStateException was thrown at initial computation | cause=null | supplier calls=1
get #3: java.util.NoSuchElementException: Unable to access the constant because java.lang.IllegalStateException was thrown at initial computation | cause=null | supplier calls=1
null result: java.util.NoSuchElementException: Unable to access the constant because java.lang.NullPointerException was thrown at initial computation | cause=java.lang.NullPointerException
recursion: java.util.NoSuchElementException: Unable to access the constant because java.lang.IllegalStateException was thrown at initial computation | cause=java.lang.IllegalStateException: Recursive invocation of a LazyConstant's computing function: Failures$$Lambda