在接口方法上缓存注释

Question

鉴于我拥有Spring Data存储库，并且在findAll方法上放置了Cacheable注释：

@Repository
@CacheConfig(cacheNames = TEMPLATE_CACHE)
public interface TemplateRepository extends JpaRepository<Template, Long> {
    @Override
    @Cacheable
    List<Template> findAll();
}

Intellij IDEA显示警告：

Spring Team recommends that you only annotate concrete classes (and methods of concrete classes) with the @Cache* annotation, as opposed to annotating interfaces. 
You certainly can place the @Cache* annotation on an interface (or an interface method), but this works only as you would expect it to if you are using interface-based proxies. 
The fact that Java annotations are not inherited from interfaces means that if you are using class-based proxies (proxy-target-class="true") or the weaving-based aspect (mode="aspectj"),
then the caching settings are not recognized by the proxying and weaving infrastructure, and the object will not be wrapped in a caching proxy, which would be decidedly bad.

真的那么糟糕吗？

从实践的角度来看会发生什么？

在我想调用findAll的情况下，该注释应放在哪里？ Controller映射？

Spring Data如何处理此问题？对我来说似乎很好。