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Globally change session language (JSTL) through a servlet

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I have a web application that uses JSTL for localization.

I want to be able to change the session language everywhere in the application.
For this, I use a servlet that is called by this url:.

This is what the servlet does:

It works just fine, but I'm not sure if that session attribute is always the same, or it's implementation specific.
It would be better if I used the constant that holds that name.

So far, looking through the API, I only found javax.servlet.jsp.jstl.core.Config.FMT_LOCALE, which has the value "javax.servlet.jsp.jstl.fmt.locale", but using that doesn't change the language.
It is sorta covered in the JavaRanch Style Guide.
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