<i18n dev> Withdrawn: 8289220: Locale.forLanguageTag throws NPE due to soft ref used in locale cache being cleared

[SUN Guoyun]

On Tue, 30 May 2023 08:31:08 GMT, SUN Guoyun <duke at openjdk.org> wrote:

> command: make test CONF=fastdebug JTREG="VM_OPTIONS=-Xcomp" TEST=gc/TestAllocHumongousFragment.java
> error info: 
> 
> Caused by: java.lang.NullPointerException: Cannot invoke "sun.util.locale.BaseLocale.getVariant()" because "base" is null
> at java.base/java.util.Locale.forLanguageTag(Locale.java:1802)
> at java.base/sun.util.cldr.CLDRBaseLocaleDataMetaInfo.<clinit>(CLDRBaseLocaleDataMetaInfo.java:41)
> ... 24 more
> 
> Note that the test runs with -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahOOMDuringEvacALot and SoftReferences are involved (LocaleObjectCache uses SoftReferences, used by printf method called in getRandomInstance(Utils.java:511)).
> 
> Maybe we have to deal with the case where the getBaseLocale() return value is null. the call stack is:
> 
> 	at java.base/sun.util.locale.LocaleObjectCache.get(LocaleObjectCache.java:64)
> 	at java.base/sun.util.locale.BaseLocale.getInstance(BaseLocale.java:169)
> 	at java.base/sun.util.locale.InternalLocaleBuilder.getBaseLocale(InternalLocaleBuilder.java:524)
> 	at java.base/java.util.Locale.forLanguageTag(Locale.java:1874)
> 
> in LocaleObjectCache.java:64
> 
> 	 62             if (key == null || newVal == null) {                                
> 	 63                 // subclass must return non-null key/value object               
> 	 64                 return null; // run here
> 	 65             }

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/14211