// Determine locale to use for this RequestContext.
LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
if (localeResolver != null) {
// Try LocaleResolver (we're within a DispatcherServlet request).
this.locale = localeResolver.resolveLocale(request);
}
else {
// No LocaleResolver available -> try fallback.
this.locale = getFallbackLocale();
}