인프런 커뮤니티 질문&답변

public void setCacheSeconds(int cacheSeconds)

Set the number of seconds to cache loaded properties files.

• Default is "-1", indicating to cache forever (just like java.util.ResourceBundle).
• A positive number will cache loaded properties files for the given number of seconds. This is essentially the interval between refresh checks. Note that a refresh attempt will first check the last-modified timestamp of the file before actually reloading it; so if files don't change, this interval can be set rather low, as refresh attempts will not actually reload.

그런데, 아래 부분에서 3초로 설정해도 application 실행 중에는 properties 파일을 변경하여도 print 되는 properties 는 변경이 없었습니다. 

@Bean
MessageSource messageSource() {
    var messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setBasename("classpath:/messages");
    messageSource.setDefaultEncoding("utf-8");
    messageSource.setCacheSeconds(3);

    return messageSource;
}