[Solved] Consider this method in a Spring Boot service: @CacheEvict(cacheNames = "products", key = "#id") public void deleteProduct(Long id) {... } What happens when deleteProduct(5L) is called? | Spring Boot

Spring Boot - Caching

Consider this method in a Spring Boot service:

@CacheEvict(cacheNames = "products", key = "#id")
public void deleteProduct(Long id) {
    productRepository.deleteById(id);
}

What happens when deleteProduct(5L) is called?

AAll entries in 'products' cache are removed

BThe cache entry with key 5 in 'products' cache is removed

CA new cache entry with key 5 is added

DThe method throws a runtime error due to missing key

Step-by-Step Solution

Solution:

Step 1: Analyze @CacheEvict usage
The annotation specifies cacheNames = "products" and key = "#id", so it targets the cache entry with the given id.
Step 2: Effect of calling deleteProduct(5L)
Calling with id 5 removes the cache entry with key 5 from the 'products' cache.
Final Answer:
The cache entry with key 5 in 'products' cache is removed -> Option B
Quick Check:
@CacheEvict with key removes specific cache entry [OK]

Quick Trick: Key in @CacheEvict targets specific cache entry [OK]

Common Mistakes:

Master "Caching" in Spring Boot

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