✅ 1. What is the Spring Framework and why is it used?
Answer:
Spring is a powerful Java framework used to build enterprise-level, scalable, and maintainable applications. It simplifies Java development by providing infrastructure support such as dependency management, transaction handling, security, and web application development.
Spring mainly helps developers by reducing boilerplate code and promoting loose coupling between components.
Why companies use Spring:
- Supports modular architecture
- Makes testing easier
- Provides built-in security and transaction management
- Integrates easily with databases and web technologies
- Supports microservices development
👉 In real-world projects, Spring is often combined with Spring Boot to speed up application development.
✅ 2. Explain Dependency Injection (DI) and Inversion of Control (IoC).
Answer:
Dependency Injection and IoC are the core concepts of Spring.
🔹 Inversion of Control (IoC)
IoC means Spring controls object creation and lifecycle instead of the developer manually creating objects using new keyword.
🔹 Dependency Injection (DI)
DI is the process where Spring automatically provides required dependencies to a class.
Types of Dependency Injection:
- Constructor Injection
- Setter Injection
- Field Injection
Example:
Instead of creating objects manually, Spring injects them using annotations like @Autowired.
Benefits:
- Loose coupling
- Better testability
- Cleaner code structure
✅ 3. What is Spring Boot and how is it different from Spring Framework?
Answer:
Spring Boot is an extension of Spring that simplifies configuration and speeds up application development.
🔹 Traditional Spring
- Requires heavy XML or manual configuration
- Needs external server setup
- Takes more setup time
🔹 Spring Boot
- Provides auto-configuration
- Includes embedded servers like Tomcat
- Uses starter dependencies
- Reduces development time drastically
Spring Boot is mostly used in modern backend and microservices development.
✅ 4. Explain Spring MVC Architecture Flow.
Answer:
Spring MVC follows the Model-View-Controller (MVC) design pattern.
🔹 Flow Explanation:
- Client sends request
- Dispatcher Servlet receives request
- Request forwarded to Controller
- Controller calls Service layer
- Service interacts with Repository/Database
- Response sent back through View or REST response
Why MVC is important:
- Separates business logic and UI
- Improves maintainability
- Makes applications scalable
✅ 5. What are commonly used Spring Annotations?
Answer:
Annotations help Spring manage components automatically.
🔹 Core Annotations:
- @Component → Marks a generic Spring component
- @Service → Marks business logic layer
- @Repository → Handles database operations
- @Controller → Handles web requests
- @RestController → Used for REST APIs
- @Autowired → Injects dependencies automatically
- @SpringBootApplication → Main configuration annotation
Why annotations are important:
- Reduce XML configuration
- Improve readability
- Enable auto component scanning
Understanding these concepts helps developers build scalable and production-ready backend applications. These questions are frequently asked because they test both theoretical knowledge and real-world development understanding.
for more tutorials: https://www.quipoin.com/tutorial/spring
Top comments (0)