Introduction to Caching — Spring Technical Interview Questions & Answers

Avoiding repeated expensive computations or DB calls.

Introduction to Caching

  • Caching stores a result so you do not repeat expensive work every time.
  • Good for heavy DB reads or slow calculations that change rarely.
  • Spring’s cache abstraction lets you switch providers later.
  • Always plan how data becomes stale and gets removed.
  • Cache for speed, but design invalidation.

Technical Interview Tip: Speed benefit + stale-data risk.

Code Examples for Introduction to Caching

Introduction to Caching — working example

// Topic: Introduction to Caching
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
class TopicController {
  @GetMapping("/api/topic")
  String topic() {
    return "Spring Boot: Introduction to Caching";
  }
}

Introduction to Caching: GET /api/topic returns this title string.

How to Explain Introduction to Caching to an Interviewer

What is Caching (sb cache intro)?

Used for a tiny REST app localhost:8080 Not just the heading

Give one small example of Caching (sb cache intro).

@SpringBootApplication + one controller Avoiding repeated expensive computations or DB calls

What mistake do beginners make with Caching (sb cache intro)?

calling Boot ‘just Spring XML’ Show the fix

Where do you use Caching (sb cache intro)?

localhost:8080 a tiny REST app