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//Return the Locale associated with the current thread,
// if any, or the   system default Locale else(English)   
LocaleContextHolder.getLocale();
so first you have to check Locale of your current thread.
If you want to set Locale in current thread then use this code :
setLocale(Locale locale); LocaleContextHolder.getLocale() will return jp_JP locale
This should allow you to get the current locale of your request:
RequestContextUtils.getLocaleResolver(request).resolveLocale(request);
Return the LocaleResolver that has been bound to the request by the DispatcherServlet.

@param request current HTTP request

@return the current LocaleResolver, or {@code null} if not found:   
public static LocaleResolver getLocaleResolver(HttpServletRequest request) {
    return (LocaleResolver) request.getAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE);
This will return a LocaleResolver from where you than can load the locale.
LocaleContextHolder
Or as metioned by: Mohammad tanvirul islam:
LocaleContextHolder.getLocale();
You can have a look at the docu here:
RequestContextUtils: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/servlet/support/RequestContextUtils.html
LocaleResolver: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/servlet/LocaleResolver.html
LocaleContextHolder: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/context/i18n/LocaleContextHolder.html
Giving a simple example for this.Let say you have resource as :Pick any one code
 @Autowired
    private MessageSource messageSource;
@GetMapping(path = "/hello-world-I18N")
    public String helloWorldInternationalize() {
        return messageSource.getMessage("good.morning.message", null, 
            LocaleContextHolder.getLocale());
@GetMapping(path = "/hello-world-I18N")
public String helloWorldInternationalize(@RequestHeader(name = "Accept-Header", required = false) Locale locale) {
    return messageSource.getMessage("good.morning.message", null, locale);
Now in request with POSTMAN send in Headers as :
Accept-Language : US/FN etc any you want.
Configure one LocaleResolver for the same:
        @Bean
        public LocaleResolver localeResolver() {
            AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
            localeResolver.setDefaultLocale(Locale.US); // set default to US
            return localeResolver;
Now in application.properties file add
spring.messages.basename=message  // message is base name for your properties file.
Add more file in resource folder with name as : message_fr.properties, message.properties
and add the content here. like (good.morning.message = Bonjour)
the code will work fine.
There are several ways to create a Locale object.To get the current Local object.
Locale locale = LocaleContextHolder.getLocale();
Locale locale;
to get the current language
Locale locale;
locale.getLanguage()
Locale locales = LocaleContextHolder.getLocale();
locales.getLanguage();
        
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