Please review this PR which removes empty nested `Lock` classes in `java.lang.Shutdown` and `java.lang.ref.ReferenceQueue`.
These are replaced with the more common "new Object()" idiom, which saves us loading these two nested classes. Additionally, this PR marks the lock objects in `Shutdown` as `final` This was initially discussed in https://mail.openjdk.org/pipermail/core-libs-dev/2026-January/157704.html. Except the observability of the lock name class, this should be a strict refactoring. No tests updated, `noreg-cleanup`. ------------- Commit messages: - Avoid loading custom empty Lock classes Changes: https://git.openjdk.org/jdk/pull/29442/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29442&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8376477 Stats: 7 lines in 2 files changed: 0 ins; 2 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/29442.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29442/head:pull/29442 PR: https://git.openjdk.org/jdk/pull/29442
