ResourceBundleMessageSource属性不起作用

Question

因此，我之前使用的是带有Sprint Boot 2.0.3的JDK 8，现在转移到了JDK 11和Spring Boot 2.1.1。而且我有一个TemplateEngine Bean处理了电子邮件的百里香模板，并且在以下ReloadableResourceBundleMessageSource

的配置下工作正常

ReloadableResourceBundleMessageSource messageSourceThymeleafConfiguration = new ReloadableResourceBundleMessageSource();
messageSourceThymeleafConfiguration.setBasename("classpath*:i18n/messages");
messageSourceThymeleafConfiguration.setDefaultEncoding("UTF-8");

现在，我已移至JDK 11和Spring Boot 2.1.1，它突然停止工作，并且在电子邮件中，而不是显示属性文件中基于语言环境的翻译。例如：

??email.greeting_en??
??email.text1_en??

我什至尝试将ReloadableResourceBundleMessageSource bean替换为ResourceBundleMessageSource并尝试，但仍然无法正常工作。我试图通过使用classpath:i18n/messages来插入基本名称字符串，但i18n/messages似乎还是不起作用。

任何帮助将不胜感激。

编辑：这是我与此相关的整个配置的样子

@Configuration
public class MailServiceThymeleafConfiguration {

    @Bean
    public TemplateEngine templateEngineThymeleafConfiguration() {
        SpringTemplateEngine templateEngineThymeleafConfiguration = new SpringTemplateEngine();
        templateEngineThymeleafConfiguration.setTemplateResolver(emailTemplateResolver());
        templateEngineThymeleafConfiguration.setMessageSource(messageSourceThymeleafConfiguration());
        return templateEngineThymeleafConfiguration;
    }

    @Bean
    @Description("Thymeleaf template resolver serving HTML 5 emails")
    public ClassLoaderTemplateResolver emailTemplateResolver() {
        ClassLoaderTemplateResolver emailTemplateResolver = new ClassLoaderTemplateResolver();
        emailTemplateResolver.setPrefix("mails/");
        emailTemplateResolver.setSuffix(".html");
        emailTemplateResolver.setTemplateMode("HTML5");
        emailTemplateResolver.setCharacterEncoding("UTF-8");
        emailTemplateResolver.setOrder(1);
        return emailTemplateResolver;
    }

    @Bean
    public MessageSource messageSourceThymeleafConfiguration() {
        ReloadableResourceBundleMessageSource messageSourceThymeleafConfiguration = new ReloadableResourceBundleMessageSource();
        messageSourceThymeleafConfiguration.setBasename("classpath*:i18n/messages");
        messageSourceThymeleafConfiguration.setDefaultEncoding("UTF-8");
        return messageSourceThymeleafConfiguration;
    }
}