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intermediate Phase · Amazon Interview Preparation

Spring Boot Questions

Spring Boot framework questions commonly asked.

1h
5 problems
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Dependency Injection Questions

Constructor Injection (Preferred)

  • Immutability, testability
  • Explicit dependencies
  • Required dependencies enforced

Bean Lifecycle

  1. Instantiation
  2. Populate properties (DI)
  3. BeanPostProcessor (before)
  4. @PostConstruct
  5. Bean ready
  6. @PreDestroy

Bean Scopes

  • singleton: one per container (default)
  • prototype: new per request
  • request: one per HTTP request

Key Points

  • Understanding Spring Boot Questions is essential for production systems
  • Always consider scalability and maintainability
  • Test thoroughly before deploying to production
  • Monitor performance and set up alerting

Common Patterns

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Spring Annotations

Stereotype

@Controller, @RestController, @Service, @Repository, @Component

Configuration

@Configuration, @Bean, @Value, @Profile

@Transactional

  • Rollback on RuntimeException (unchecked) by default
  • Propagation: REQUIRED, REQUIRES_NEW, NESTED
  • @Transactional is AOP-based proxy

Key Points

  • Understanding Spring Boot Questions is essential for production systems
  • Always consider scalability and maintainability
  • Test thoroughly before deploying to production
  • Monitor performance and set up alerting

Common Patterns

  1. Validation: Always validate input at the boundary
  2. Error Handling: Use structured error responses
  3. Logging: Log key events for debugging
  4. Testing: Unit, integration, and load tests
  5. Documentation: Keep docs updated with code changes

Practice Problems

0 / 3 solved
Implement Spring Boot Questions

Design and implement a solution for Spring Boot Questions in a backend system. Consider scalability, error handling, and production readiness.

Solution 
// Spring Boot Questions implementation
// Key aspects: validation, error handling, logging, testing

public class SpringBootQuestions {
    // Production-ready implementation
}
Spring Boot Questions Edge Cases

Identify and handle edge cases for Spring Boot Questions. What happens under high load, with invalid input, or during failures?

Solution 
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotency
Spring Boot Questions Testing Strategy

Write a testing strategy for Spring Boot Questions. Include unit tests, integration tests, and performance tests.

Solution 
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injection

Quiz

1. Preferred DI method in Spring?

Question 1 options

2. @Transactional rolls back on?

Question 2 options

3. What is a common mistake when implementing Spring Boot Questions?

Question 3 options

Flashcards

Question

Preferred DI method?

Click to reveal answer

Answer

Constructor injection - explicit, immutable, testable

Question

@Transactional rollback?

Click to reveal answer

Answer

Rolls back on RuntimeException by default

Question

Spring Boot Questions best practices

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Answer

Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.

Revision Notes

Key Takeaways

  • 1. Constructor injection preferred
  • 2. Bean lifecycle: instantiation -> DI -> init -> ready
  • 3. @Transactional rolls back on RuntimeException
  • 4. Stereotype: @Controller, @Service, @Repository

Interview Tips

  • • Explain why constructor injection is better
  • • Know bean lifecycle stages
  • • Discuss @Transactional pitfalls

Cheat Sheet

Spring Boot Interview

  • DI: Constructor injection (preferred)
  • Scopes: singleton (default), prototype, request, session
  • @Transactional: Rolls back on RuntimeException