[Solved] A developer wrote this code:@Cacheable("users") public void saveUser(User user) { userRepository.save(user); }Why does caching not work as expected? | Spring Boot

Spring Boot - Caching

A developer wrote this code:

@Cacheable("users")
public void saveUser(User user) {
  userRepository.save(user);
}

Why does caching not work as expected?

AMethod returns void, so no result to cache

BMissing @EnableCaching annotation

CCache name "users" is invalid

DRedis server is down

Step-by-Step Solution

Solution:

Step 1: Analyze method return type
@Cacheable caches method return values; void methods return nothing, so nothing to cache.
Step 2: Check other options
Missing @EnableCaching disables caching globally but question focuses on method; cache name "users" is valid; Redis server down causes errors, not silent no caching.
Final Answer:
Method returns void, so no result to cache -> Option A
Quick Check:
@Cacheable requires non-void return to cache [OK]

Quick Trick: @Cacheable needs a return value to cache [OK]

Common Mistakes:

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A developer wrote this code: