Spring Boot Localization issue - Accept-Language header : <p>We are using Spring Boot for the application. In ApplicationConfig.java I have the below code</p>

<pre><code> @Bean
    public LocaleResolver localeResolver() {
        return new SmartLocaleResolver();
    }
</code></pre>

<p>and the SmartLocaleResolver.java is below</p>

<pre><code>public class SmartLocaleResolver extends SessionLocaleResolver {

    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        final String acceptLanguage = request.getHeader("Accept-Language");
        if (acceptLanguage.contains(",")) {
            String[] aheader = acceptLanguage.split(",[ ]*");    
            for (String locale : aheader) {    
                if (ApplicationConstants.LOCALE.contains(locale)) {
                    locale.trim();
                    return Locale.forLanguageTag(locale);
                }
            }
        } else if (!acceptLanguage.contains(",") &amp;&amp; !acceptLanguage.isEmpty()) {
            if (ApplicationConstants.LOCALE.contains(acceptLanguage)) {
                return Locale.forLanguageTag(acceptLanguage);
            }
        }
        return request.getLocale();
    }
}
</code></pre>

<p>and I have in my constants class the below to compare the value from header Accept-Language.</p>

<p>public static final List LOCALE                          = Collections
            .unmodifiableList(Arrays.asList("en", "es"));</p>

<p>I know in actual scenario the header will be like
Accept-Language : fr,es;q=0.8,en-us;q=0.6 but for testing purpose i'm passing it as below.</p>

<p>Accept-language : fr,es,en</p>

<p>The code is not complete yet, but i'm just testing from postman to see if the code picks up "es" as the locale and gives me the localized result.</p>

<p>I don't have messages_fr.properties file but I have messages_es.properties so I expect if the application sets the locale from the below code, it would pick Locale as 'es' and give the values I want in Spanish. What changes I need to make here for the code to work?  </p>
