Locale languageTag anomaly

[Jonathan Gibbons]

Naoto,

Thanks, and I guess I didn't think to check out the special case rules. 
Sorry about that.

-- Jon

On 06/07/2018 02:42 PM, Naoto Sato wrote:
> Hi Jon,
>
> JDK historically represents Norwegian Nynorsk language with no_NO_NY 
> (JDK unique "NY" variant), because it predates the ISO 639-1:2002 
> standard which introduced "nn" as the language code for Nynorsk. This 
> legacy JDK locale is converted to BCP47 compliant language tag using 
> "nn" language code.
>
> Locale.toLanguageTag() has the following sentence for this:
>
> ---
> A locale with language "no", country "NO", and variant "NY", 
> representing Norwegian Nynorsk (Norway), is converted to a language 
> tag "nn-NO".
> ---
>
> So in short, that is the expected behavior.
>
> Naoto
>
> On 6/7/18 2:19 PM, Jonathan Gibbons wrote:
>> Regarding Locale.toLanguageTag, Locale.forLanguageTag
>>
>> Should I be surprised (i.e. is it a bug) that out of 736 installed 
>> locales in a standard build of JDK, exactly 1 locale fails the 
>> following round-trip test:
>>
>> locale.equals(Locale.forLanguageTag(locale.toLanguageTag()))
>>
>> The locale "no_NO_NY" comes back as "nn_NO".
>>
>> Attached is a test program.  Here is the output from the test program:
>>
>> $ /opt/jdk/1.9.0/bin/java -cp play/locales/classes Locales
>> test locale: no_NO_NY [no,NO,NY] nn-NO
>>       forLanguageTag: nn_NO
>> Tested 736 locales
>> Mismatch 1 locales
>>
>> -- Jon