Prepare for your next tech interview with these top Spring Boot interview questions and answers. Covering core concepts, annotations, REST APIs, JPA, security, and more — ideal for beginners to advanced developers.
🚀 Spring Boot Classified by Topic
1. 💻 Core Concepts
- Spring Framework
- Spring Boot Basics
- Spring Boot Starter Dependencies
- Auto Configuration
- Spring Boot Annotations
2. 🧱 Application Structure
- Project Structure (Maven/Gradle)
- Component Scanning
- Application Properties / YAML
- Profiles and Configuration Management
3. 🔧 Dependency Injection & Beans
- @Component, @Service, @Repository
- @Autowired and Constructor Injection
- Bean Lifecycle
- Custom Bean Configuration
4. 🌐 Web Development (REST APIs)
- Spring MVC with @RestController
- Request Mappings (@GetMapping, @PostMapping, etc.)
- Request/Response DTOs
- Exception Handling (@ControllerAdvice)
5. 🗄️ Data Access
- Spring Data JPA
- Hibernate Integration
- Repositories and Query Methods
- Transactions and Entity Mapping
6. 🔒 Security
- Spring Security Basics
- Authentication & Authorization
- JWT Token Integration
- OAuth2 and Role-Based Access Control
7. 🎯 Testing
- Unit Testing with JUnit & Mockito
- Integration Testing with @SpringBootTest
- Testing REST Endpoints (MockMvc / WebTestClient)
8. 🧪 DevOps & Deployment
- Application Packaging (JAR/WAR)
- Dockerizing Spring Boot Apps
- CI/CD with Jenkins/GitHub Actions
- Environment Variables & ConfigMaps
9. ☸️ Kubernetes & Cloud-Native
- Spring Boot with Kubernetes
- Helm Charts for Spring Boot
- Service Discovery with Spring Cloud
- Spring Boot in Docker & K8s Pipelines
10. 📈 Observability & Monitoring
- Actuator Endpoints
- Micrometer Metrics
- Integration with Prometheus/Grafana
- Distributed Tracing (Zipkin/Jaeger)
11. ⚙️ Advanced Topics
- Reactive Programming with WebFlux
- Caching (EhCache, Redis)
- Scheduling with @Scheduled
- Async Programming (@Async)
12. 🔄 Messaging & Integration
- Spring Boot + Kafka/RabbitMQ
- Event-Driven Architecture
- Integration with External APIs