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https://issues.apache.org/jira/browse/SLING-877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678718#action_12678718
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Bertrand Delacretaz commented on SLING-877:
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Agree with Jukka that not doing any checks seems reasonable.

Do you know what's specified to happen if calling new Locale("foo", "bar") and 
there's no foo_bar locale available?

In a quick test I seem to get the VM's default locale in that case, but the 
Locale javadocs don't specify this case.

> Avoid calling Locale.getAvailableLocales() because it is very slow
> ------------------------------------------------------------------
>
>                 Key: SLING-877
>                 URL: https://issues.apache.org/jira/browse/SLING-877
>             Project: Sling
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Thomas Mueller
>         Attachments: JcrResourceBundleProvider.patch
>
>
> Currently, JcrResourceBundleProvider.toLocale calls 
> Locale.getAvailableLocales().
> The first call to this method is very slow (3.4 seconds on my machine) because
> it scans many jar files.
> http://svn.apache.org/viewvc/incubator/sling/trunk/bundles/extensions/i18n/src/main/java/org/apache/sling/i18n/impl/JcrResourceBundleProvider.java?view=markup
> It looks like calling this method is not required.

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