On Tue, 15 Sep 2026 02:39:52 GMT, moseoh <[email protected]> wrote: > `CLDRTimeZoneNameProviderImpl.getDisplayNameArray()` modifies the array > cached by `LocaleResources` when filling in missing time zone names. > As a result, names derived for a parent locale can be reused by a later > lookup for a child locale, making the result depend on lookup order. > > This change copies the array before updating the zone ID and deriving > fallback names, leaving the cached array unchanged. > > `TimeZoneNameOrderTest` compares a direct lookup with a lookup made after > querying the parent locale. The two runs use separate JVMs so that they > do not share cached state. > > `TimeZoneNameConcurrencyTest` compares concurrent first lookups with > sequential lookups in a fresh JVM. It is included to cover the race seen > in 11u/17u/21u; it passes on mainline both before and after the fix. > > Tested with jtreg sun/util, java/util/TimeZone and java/util/Locale on > linux-x64. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai).
This pull request has now been integrated. Changeset: d6c4fe7b Author: moseoh <[email protected]> Committer: Naoto Sato <[email protected]> URL: https://git.openjdk.org/jdk/commit/d6c4fe7b39d5d9f1a4758ca5214aa95c7a84b92d Stats: 215 lines in 3 files changed: 214 ins; 0 del; 1 mod 8392223: CLDR provider mutates shared cached time zone name arrays Reviewed-by: naoto ------------- PR: https://git.openjdk.org/jdk/pull/32867
