RFR: 8361717: Refactor Collections.emptyList() in Locale related classes

[Chen Liang]

On Wed, 9 Jul 2025 18:39:40 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Replaced Collections.emptyList() with List.of() as part of refactoring. This was discussed in the context of investigating a CDS-related issue (https://bugs.openjdk.org/browse/JDK-8357281?focusedId=14796714&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14796714). Although the root cause was ultimately determined to be user error, modernizing the code by using List.of() is still a desirable improvement

Both lists aren't returned to users, so their null-hostile contains behavior has no impact.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26225#pullrequestreview-3002824059