SpringBoot SmartInitializingSingleton beans are not working with lazy initialization

Using spring.main.lazy-initialization=true causes @Cacheable to not work.

Test sample repo: https://github.com/cdalexndr/spring-boot-issue-26470

Spring Boot 2.4.4

Comment From: wilkinsona

Thanks for the sample. You can work around the problem by excluding the CacheInterceptor (a CacheAspectSupport) from lazy initialization:

@Bean
LazyInitializationExcludeFilter eagerCacheAspectSupportInitialization() {
    return LazyInitializationExcludeFilter.forBeanTypes(CacheAspectSupport.class);
}

It's a SmartInitializingSingleton and the afterSingletonsInstantiated() callback isn't invoked for singleton beans that are lazily initialized. This leaves it in an uninitialised state and stops caching from working.

Comment From: wilkinsona

We want to investigate whether we should exclude all SmartInitializingSingletons from lazy initialization or tackle them on a case-by-case basis. A concern with doing it for all is that it may result in a cascade of eager initialization that removes much of the benefit of lazy initialization.

Comment From: wilkinsona

Our main concern was Hibernate via HibernateMetricsAutoConfiguration (a SmartInitializingSingleton), but it is already eagerly initialized due to LocalContainerEntityManagerFactoryBean being LoadTimeWeaverAware.

Comment From: HustonPeng

I ran it under tomcat, it returns 0 always.

So i guess maybe the @AutoConfigureCache has a problem for setup test.