@RepositoryEventHandler isn't work

UserEventHandler.JAVA

@RepositoryEventHandler(User.class)
public class UserEventHandler {

    @HandleBeforeSave
    public void handleBeforeSave(User user) {
        System.out.println("**********handleBeforeSave***********");
    }

    @HandleAfterDelete
    public void handleAfterDelete(User user) {
        System.out.println("**********handleAfterDelete***********");
    }
}

MyRepositoryRestMvcConfiguration.java

@Configuration
public class MyRepositoryRestMvcConfiguration extends RepositoryRestMvcConfiguration {
    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource msgsrc = new ReloadableResourceBundleMessageSource();
        msgsrc.setBasename("/WEB-INF/classes/ValidationMessages");
        msgsrc.setFallbackToSystemLocale(false);
        return msgsrc;
    }

    @Bean
    UserEventHandler UserEventHandler() {
        return new UserEventHandler();
    }
}

How trigger it?need publish custom event in spring context?

Start with UserEventHandler.java and MyRepositoryRestMvcConfiguration.java, then trace how the registered @RepositoryEventHandler is discovered and how repository operations trigger events. Reproduce the example and determine whether publishing a custom Spring context event is required; done means the handler behavior and trigger path are confirmed or the missing configuration is identified.