Spring Boot Spring Boot Caching and Messaging

Question 1

Which annotation enables Spring's annotation-driven caching infrastructure in a Spring Boot application?

Accepted Answer

@EnableCaching

Answer

`@EnableCaching` activates the post-processor that detects `@Cacheable`, `@CacheEvict`, and `@CachePut` annotations on Spring beans.

Question 2

What does the `@Cacheable` annotation do when applied to a Spring service method?

Accepted Answer

Caches the method return value using the method arguments as the key

Answer

`@Cacheable` intercepts the method call, checks the named cache for an existing entry, and only invokes the method on a cache miss.

Question 3

Which Spring Boot starter auto-configures Redis as a cache provider?

Accepted Answer

spring-boot-starter-data-redis

Answer

Adding `spring-boot-starter-data-redis` and `spring-boot-starter-cache` together causes Spring Boot to auto-configure `RedisCacheManager` as the default `CacheManager`.

Question 4

What is the purpose of the `@CacheEvict` annotation?

Accepted Answer

Removes one or all entries from a named cache

Answer

`@CacheEvict` triggers removal of specific entries (or all entries with `allEntries=true`) from the named cache when the annotated method is called.

Question 5

Which Spring Boot property sets the default Time-To-Live for entries in a Redis cache?

Accepted Answer

spring.cache.redis.time-to-live

Answer

`spring.cache.redis.time-to-live` configures the duration after which cache entries are automatically expired from Redis.

Spring Boot Practice Test

Spring Boot Practice Test

Spring Boot Spring Boot Caching and Messaging