RFR: 8366401: JCK test api/java_text/DecimalFormatSymbols/serial/InputTests.html fails after JDK-8363972

[Naoto Sato]

On Fri, 29 Aug 2025 18:00:25 GMT, Justin Lu <jlu at openjdk.org> wrote:

> This PR addresses a JCK test failure related to `DecimalFormatSymbols` de-serialization. While the current public API of DFS disallows a null locale, it was possible to set in the past. Thus, the `loadNumberData(locale)` call currently throws NPE when locale is null in the stream. The call should be guarded with a null check, such that if locale is null, then `lenientMinusSigns` defaults to `minusSignText`.
> 
> Defaulting the locale field when `null` to Locale.ROOT is also a reasonable solution, but I think that the current one is preferable as a user would not expect locale data related logic to occur if locale is `null`.

There are some tests for serializing DecimalFormatSymbols, but I agree that it would be desirable to revisit and cover missing cases.

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PR Comment: https://git.openjdk.org/jdk/pull/27008#issuecomment-3245960204