Java Interview Preparation
Caching Interview Questions
Spring caching, Redis integration, eviction, expiration, consistency, and cache stampede prevention.
Caching Interview Focus
Spring caching, Redis integration, eviction, expiration, consistency, and cache stampede prevention.
Interview questions
1. How do you enable caching in Spring Boot? Beginner
Enable caching with @EnableCaching. @Cacheable reads or stores a method result, @CachePut always runs the method and updates the cache, and @CacheEvict removes entries. Redis is a common shared provider for distributed applications; define keys, TTLs, and consistency rules carefully.
2. What is the purpose of @EnableCaching? Beginner
Enable caching with @EnableCaching. @Cacheable reads or stores a method result, @CachePut always runs the method and updates the cache, and @CacheEvict removes entries. Redis is a common shared provider for distributed applications; define keys, TTLs, and consistency rules carefully.
3. What is the difference between @Cacheable, @CachePut, and @CacheEvict? Intermediate
Enable caching with @EnableCaching. @Cacheable reads or stores a method result, @CachePut always runs the method and updates the cache, and @CacheEvict removes entries. Redis is a common shared provider for distributed applications; define keys, TTLs, and consistency rules carefully.
4. Which cache providers are supported? Beginner
Caching improves response time by reusing frequently requested data, but it requires clear expiry and consistency rules. Start with the definition, understand which problem it solves, and then apply it in a small example. In an interview, explain the normal use, the main trade-off, and one practical mistake to avoid.
5. How do you integrate Redis caching? Intermediate
Enable caching with @EnableCaching. @Cacheable reads or stores a method result, @CachePut always runs the method and updates the cache, and @CacheEvict removes entries. Redis is a common shared provider for distributed applications; define keys, TTLs, and consistency rules carefully.
6. What is cache eviction? Beginner
Caching improves response time by reusing frequently requested data, but it requires clear expiry and consistency rules. Start with the definition, understand which problem it solves, and then apply it in a small example. In an interview, explain the normal use, the main trade-off, and one practical mistake to avoid.
7. What is cache expiration? Beginner
Caching improves response time by reusing frequently requested data, but it requires clear expiry and consistency rules. Start with the definition, understand which problem it solves, and then apply it in a small example. In an interview, explain the normal use, the main trade-off, and one practical mistake to avoid.
8. What is the cache stampede problem? Advanced
A cache stampede occurs when many requests regenerate the same expired value at once. Use TTL jitter, locking, request coalescing, or stale-while-revalidate. Update or evict related entries when the source data changes.
9. How do you maintain cache consistency? Advanced
A cache stampede occurs when many requests regenerate the same expired value at once. Use TTL jitter, locking, request coalescing, or stale-while-revalidate. Update or evict related entries when the source data changes.
How to Prepare for Java Technical Interviews
Use this Java technical interview question bank to revise core concepts and practise explaining your decisions clearly. The questions cover Java fundamentals, object-oriented programming, collections, exceptions, multithreading, Spring Boot, Hibernate, databases, and other topics used in real software development interviews.
Start with the fundamentals, then move to scenario-based questions and advanced topics. Filter questions by difficulty to build confidence gradually. A strong answer should define the concept, explain why it matters, and include a practical example when appropriate.
Continue your preparation with the Java tutorials, or explore all interview preparation tracks for managerial and company-focused questions.