[Solved] Given the following method annotated with @Cacheable("books"), what happens when getBook(5) is called twice?@Cacheable("books") public Book getBook(int id) { System.out.... | Spring Boot

Spring Boot - Caching

Given the following method annotated with @Cacheable("books"), what happens when getBook(5) is called twice?

@Cacheable("books")
public Book getBook(int id) {
  System.out.println("Fetching book " + id);
  return bookRepository.findById(id);
}

AThe message prints twice; cache is not used

BThe message prints once; second call throws exception

CThe message never prints; cache is preloaded

DThe message prints once; second call returns cached Book without printing

Step-by-Step Solution

Solution:

Step 1: Understand @Cacheable behavior
On first call, method executes and caches result; on second call with same argument, cached result returns without method execution.
Step 2: Analyze output
Message prints only on first call; second call returns cached Book silently.
Final Answer:
The message prints once; second call returns cached Book without printing -> Option D
Quick Check:
@Cacheable caches method call result [OK]

Quick Trick: First call runs method; later calls use cache [OK]

Common Mistakes:

Master "Caching" in Spring Boot

9 interactive learning modes - each teaches the same concept differently

More Spring Boot Quizzes

Given the following method annotated with @Cacheable("books"), what happens when getBook(5) is called twice?