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https://issues.apache.org/jira/browse/WW-4677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15502611#comment-15502611
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Lukasz Lenart commented on WW-4677:
-----------------------------------

I went a be different way and extended {{LocaleProvider}} to be used as a 
validator in context of {{Locale}}, now you can implement your own versions to 
be used with the {{I18NInterceptor}} and it will be consistent over the whole 
framework :)

> I18N Interceptor automatically validates locales
> ------------------------------------------------
>
>                 Key: WW-4677
>                 URL: https://issues.apache.org/jira/browse/WW-4677
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Core Interceptors
>    Affects Versions: 2.5
>         Environment: 2.5.1 running on Java 8, RHEL Linux 6/7 
>            Reporter: Zoran Avtarovski
>             Fix For: 2.5.3
>
>
> There is an annoying issue with the I18N Interceptor, which now validates 
> locales against the list of default available locales in this bit of code:
> {code:java}
> if (locale != null && 
> Arrays.asList(Locale.getAvailableLocales()).contains(locale)) {
>     locale = Locale.getDefault();
> }
> {code}
> The problem is I have a web app for refugees and not all the languages are in 
> the available locales array. This must be relatively new as it worked in the 
> old version 2.x ish.
> Ideally it would be great if we could add a parameter (or constant) to 
> bi-pass the validation.
> For example a tag in the struts.xml file:
> {code:xml}
> <interceptor-ref name="I18nInterceptor">
>   <param name="validation">
>      false
>   </param>
> </interceptor-ref>
> {code}
> and then access it in the interceptor to override default behaviour.



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