@CacheEvict for invalidation in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the @CacheEvict annotation in Spring Boot?

The @CacheEvict annotation is used to remove or invalidate cache entries when a method is called, ensuring that stale data is not served from the cache.

beginner

How do you specify which cache to evict using @CacheEvict?

You specify the cache name(s) to evict using the 'value' or 'cacheNames' attribute, for example: @CacheEvict(value = "usersCache").

intermediate

What does the 'allEntries' attribute do in @CacheEvict?

Setting 'allEntries = true' removes all entries from the specified cache instead of just the one related to the method's key.

intermediate

Explain the use of 'beforeInvocation' attribute in @CacheEvict.

The 'beforeInvocation' attribute controls whether the cache eviction happens before the method runs (true) or after it completes (false). By default, eviction happens after the method runs.

intermediate

Can @CacheEvict be used to evict multiple caches at once? How?

Yes, by specifying multiple cache names in the 'value' or 'cacheNames' attribute as an array, e.g., @CacheEvict(value = {"cache1", "cache2"}).

What happens if you set allEntries = true in @CacheEvict?

A All entries in the specified cache are removed

B The cache entries are refreshed automatically

C The cache is disabled permanently

D Only the cache entry related to the method key is removed

Setting allEntries = true removes all entries from the cache, not just the one related to the method key.

When does cache eviction occur by default with @CacheEvict?

A Before the annotated method runs

B Only if the method throws an exception

C After the annotated method completes successfully

D Immediately when the application starts

By default, cache eviction happens after the annotated method completes successfully.

How do you specify multiple caches to evict in @CacheEvict?

A You cannot evict multiple caches at once

B Use multiple @CacheEvict annotations

C Use the cacheNames attribute with a single string

D Pass an array of cache names to the value attribute

You can specify multiple caches by passing an array of cache names to the value or cacheNames attribute.

What does setting beforeInvocation = true do in @CacheEvict?

A Evicts cache entries before the method runs

B Evicts cache entries after the method runs

C Prevents cache eviction

D Evicts cache only if the method throws an exception

Setting beforeInvocation = true causes cache eviction to happen before the annotated method runs.

Which attribute in @CacheEvict defines the cache to clear?

A key

B value or cacheNames

C condition

D sync

The value or cacheNames attribute specifies which cache(s) to evict entries from.

Describe how @CacheEvict helps keep cache data fresh in a Spring Boot application.

Think about when and why you want to clear cache entries.

Explain the difference between evicting cache before vs after method execution using @CacheEvict.

Consider what happens if the method fails or throws an error.