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https://issues.apache.org/jira/browse/WW-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17953203#comment-17953203
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Rafa commented on WW-5549:
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It seems that not only {{?request_locale=}} functionality does not work then
(when {{supportedLocale}} is used).
Any language change (e.g. by setting different locale to session under
{{org.apache.struts2.interceptor.I18nInterceptor.DEFAULT_SESSION_ATTRIBUTE}} is
not working as well.
> i18n interceptor param supportedLocale (when set) disables request_locale
> param functionality
> ---------------------------------------------------------------------------------------------
>
> Key: WW-5549
> URL: https://issues.apache.org/jira/browse/WW-5549
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 6.3.0
> Reporter: Rafa
> Priority: Minor
>
> It seems that when {{supportedLocale}} parameter is set on {{i18n}}
> interceptor - language change using {{request_locale}} param is not possible
> anymore if current browser {{Accept-Language}} matches the
> {{supportedLocale}} value.
> I set {{supportedLocale}} parameter on the {{i18n}} interceptor (e.g. to
> {{fr,en}} value). Now i enter the webapp (using a browser with fr language
> set as default) and the struts locale is set to {{fr}} (as expected - ok).
> Now i try switching the locale to {{en}} using the {{?request_locale=en}}
> built-in feature - but this does not work ({{{}fr{}}} is still set as
> language).
> If i do not set the {{supportedLocale}} param on the {{i18n}} interceptor -
> everything works fine (for exactly the same webapp, and the
> {{request_locale}} request param switch is working fine) but then i loose the
> feature of {_}struts preselecting fr language as default for browsers with fr
> language set as default{_}.
> When i look into the source code of
> [I18nInterceptor.java|https://github.com/apache/struts/blob/main/core/src/main/java/org/apache/struts2/interceptor/I18nInterceptor.java#L302]
> (line 302) it looks like {{AcceptLanguageLocaleHandler.find()}} is always
> returning one of the {{supportedLocale}} locales if browser has matching
> {{Accept-Language}} header - but it shall not e.g. when {{request_locale}}
> param is set (it shall take precedence here).
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