How to handle multiple files and messages for internationalization in Spring?

You can either define a global MessageSource for all those different message files. This approach is practical using the setBasenames method:

@Beanpublic MessageSource messageSource() {    ReloadableResourceBundleMessageSource messageSource =                                                new ReloadableResourceBundleMessageSource();    messageSource.setBasenames("classpath:/messages/business/message",                                "classpath:/messages/validation/message",                               "classpath:/messages/view/message");    return messageSource;}

This approach makes sense if your message keys are unique across all files, e.g. business-12 key only exits in business related message sources. Otherwise, it's better to define one MessageSource per context and inject them according to your context:

@Beanpublic MessageSource businessMessageSource() {    ReloadableResourceBundleMessageSource messageSource =                                                new ReloadableResourceBundleMessageSource();    messageSource.setBasename("classpath:/messages/business/message");    return messageSource;}@Beanpublic MessageSource validationMessageSource() {    ReloadableResourceBundleMessageSource messageSource =                                                new ReloadableResourceBundleMessageSource();    messageSource.setBasename("classpath:/messages/validation/message");    return messageSource;}@Beanpublic MessageSource viewMessageSource() {    ReloadableResourceBundleMessageSource messageSource =                                                new ReloadableResourceBundleMessageSource();    messageSource.setBasename("classpath:/messages/view/message");    return messageSource;}