Spring boot application and MessageSource

Can you create a messages package in resources and try this Bean implementation in your configuration file:

@Bean
public MessageSource messageSource() {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setBasename("classpath:messages");
    messageSource.setCacheSeconds(10); //reload messages every 10 seconds
    return messageSource;
}

Additionally, I suggest you to use @Configuration annotated configuration classes instead of xml files to be adapted perfectly to Spring Boot concept.

I had the same issue on springboot app. I have tested one of the below options:

If you prefer to modify application.properties file then add this line spring.messages.basename=messages where messages is the prefix of the file containing your messages. with this u don't have to setup a messagesource bean yourself.

or

i had to give the MessageResource bean a name and autowire it using the name given during initialization, otherwise DelegatingMessageSource was being injected and it wasn't resolving to any message source.

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean                 
    public LocaleResolver localeResolver() {

        SessionLocaleResolver localResolver=new SessionLocaleResolver();
        localResolver.setDefaultLocale(Locale.US);
        return localResolver;
    }

    @Bean(name = "messageResourceSB")
    public MessageSource messageResource() {
        ResourceBundleMessageSource messageBundleResrc=new ResourceBundleMessageSource();
        messageBundleResrc.setBasename("msg.message");
        return messageBundleResrc;
    }

}

then autowire the bean with the name u expect

@RestController
public class Internationalization {

    @Autowired
    @Qualifier("messageResourceSB")
    MessageSource messageSource;

    @GetMapping(path = "/sayHelloIntern")
    public String sayHello(@RequestHeader(name="Accept-Language",required = false) Locale locale) {
        return messageSource.getMessage("message.greeting", null, locale);
    }
}

You can also configure through application.properties

below i18n.messages points to messages files under classpath folder i18n

spring.messages.basename=i18n.messages

Refer SpringBoot doc click here

The issue was my Eclipse encoding configuration, which I haven't managed to fix yet.

After debugging Spring's code (ReloadableResourceBundleMessageSource.java) I could see my key=value property loaded, but with 3 space characters before each character (e.g. t e s t = T h i s i s a d e m o a p p !).

On another PC the same demo application works fine.