Spring Tutorial

1. Spring Introduction

What the core Spring Framework is, the problem of manually wiring dependencies, and how the IoC container solves it.

2. Dependency Injection & Beans

@Component, @Service and @Repository stereotypes, constructor vs field injection, the ApplicationContext, and bean scopes.

3. Spring Configuration & Profiles

Java-based @Configuration and @Bean, @ComponentScan, environment profiles, and property injection with @Value.

4. AOP & Proxies

@Aspect, a complete logging/timing aspect, how Spring AOP proxies actually work, and the self-invocation limitation.

5. Testing with Spring

@SpringBootTest and @MockBean, with a complete example testing a service and mocking one of its dependencies.

6. Spring Interview Questions

Commonly asked core Spring Framework interview questions with clear, practical answers.