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javaspringspring-mvcinternationalizationthymeleaf

Spring boot with i18n (internationalization) and thymeleaf

I am trying to get i18n to work with my spring boot application, which uses thymeleaf as template engine.

I followed some tutorials, which showed me how to define message source and locale resolver, so I made this configuration class:

@Configuration
@EnableWebMvc
public class AppConfig extends WebMvcConfigurerAdapter {

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource msgSrc = new ReloadableResourceBundleMessageSource();
        msgSrc.setBasename("i18n/messages");
        msgSrc.setDefaultEncoding("UTF-8");
        return msgSrc;
    }

    @Bean
    public LocaleResolver localeResolver() {
        CookieLocaleResolver resolver = new CookieLocaleResolver();
        resolver.setDefaultLocale(new Locale("en"));
        resolver.setCookieName("myI18N_cookie");
        return resolver;
    }

    @Override
    public void addInterceptors(InterceptorRegistry reg) {
        LocaleChangeInterceptor interceptor = new LocaleChangeInterceptor();
        interceptor.setParamName("locale");
        reg.addInterceptor(interceptor);
    }

}

Then, in my resource folder (src/main/resources) i made folder i18n and inside i put messages.properties and messages_sl.properties

inside there is defined first.greeting = Hello World!

And this is my thymeleaf template:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" th:with="lang=${#locale.language}" th:lang="${lang}">
    <head>
        <meta charset="UTF-8"/>
    </head>
    <body>
        <a href="/?locale=en">English</a> | <a href="/?locale=sl">Slovenian</a>
        <h3 th:text="#{first.greeting}"></h3>
    </body>
</html>

My Controller is nothing special, it just forwards this view when I access it and in my properties file i have defined:

spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.cache=false

However, when I load page, instead of Hello World! I get ??first.greeting_en?? or ??first.greeting_sl??, depending on set locale.

Everywhere I looked I saw same configuration, so I am really lost as what am I missing.

And here is my project structure:

🗁 src
   └─── 🗁 main
       ├─── 🗁 java
       │   └─── 🗁 com
       │       └─── 🗁 mjamsek
       │           └─── 🗁 Simple_i18n
       │               ├─── 🗁 conf
       │               └─── 🗁 controller
       └─── 🗁 resources
           ├─── 🗁 i18n
           │   ├─── messages.properties
           │   └─── messages_sl.properties
           ├─── 🗁 static
           └─── 🗁 templates
Solution

  • Add the classpath: prefix to MessageSource's basename

    msgSrc.setBasename("classpath:i18n/messages");