[Solved] Given the code below, what will be the output when getUser(1) is called twice?@Cacheable("users") public User getUser(int id) { System.out.println("Fetching user from DB"); | Spring Boot

Spring Boot - Caching

Given the code below, what will be the output when getUser(1) is called twice?

@Cacheable("users")
public User getUser(int id) {
    System.out.println("Fetching user from DB");
    return new User(id, "Name" + id);
}

AFetching user from DB printed twice, two User objects returned

BNo output printed, both calls return null

CFetching user from DB printed once, but both calls create new User

DFetching user from DB printed once, second call returns cached User

Step-by-Step Solution

Solution:

Step 1: Understand @Cacheable behavior
The first call runs the method and caches the result; subsequent calls return cached data.
Step 2: Analyze output for two calls
"Fetching user from DB" prints only once on first call; second call uses cache, no print.
Final Answer:
Fetching user from DB printed once, second call returns cached User -> Option D
Quick Check:
@Cacheable caches after first call [OK]

Quick Trick: First call runs method, next calls use cache [OK]

Common Mistakes:

Master "Caching" in Spring Boot

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Given the code below, what will be the output when getUser(1) is called twice?