SpringBoot Internationalization and Localization based in URL mapping

I'm implementing internationalization and localization in my project where Locale is based in URL mapping of languages, for example, /en, /ja and /fr. I spend the whole day browsing for answer but majority I read is using LocaleChangeInterceptor setter method setParamName("lang"). Basically changing Locale upon intercepting parameter lang:

http://localhost:8081/index?lang=fr

I want to make Locale change based in URL mapping like http://localhost:8081/index/en

Current configuration:

@Configuration
public class MessageConfig implements WebMvcConfigurer {

    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver slr = new SessionLocaleResolver();
        slr.setDefaultLocale(Locale.JAPAN);
        slr.setLocaleAttributeName("session.current.locale");
        slr.setTimeZoneAttributeName("session.current.timezone");
        return slr;
    }

    @Bean
    public LocaleChangeInterceptor localChangeInterceptor() {
        LocaleChangeInterceptor localeChangeInterceptor = new LocaleChangeInterceptor();
        localeChangeInterceptor.setParamName("lang");
        return localeChangeInterceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(localChangeInterceptor());
    }

    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasenames("language/messages");
        messageSource.setDefaultEncoding("UTF-8");
        return messageSource;
    }
}

Resources: