Cloud-Native Applications in Java

Under the hood

While it is nice that Spring handles a lot of concerns such as caching implementation under the hood, it is important to understand what is happening and be aware of the limitations.

Internally, caching is implemented by internal classes such as cache manager and cache resolver. When no caching product or framework is supplied, Spring uses ConcurrentHashMap by default. Spring's caching implements many other local caches such as EHCache, Guava, and Caffeine.

Check out the Spring documentation (https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/cache/annotation/Cacheable.html) for more intricacies such as sync=true and conditional caching.