🚀 Spring Core - Complete FAANG Level Roadmap

✅ 1. Spring Core Introduction

• What is Spring Framework?
• Evolution of Spring
• Spring Modules (Core, Data, MVC, AOP, Security, Boot, Batch, etc.)
• Monolithic vs Microservices

Why Important?

This is the foundation. Expect interviewers to ask why Spring exists and how it compares to EJB/Struts.

✅ 2. IOC (Inversion of Control) & Dependency Injection

• What is IoC?
• ApplicationContext vs BeanFactory (Differences & Use Cases)
• DI Types:
  • Constructor Injection
  • Setter Injection
  • Field Injection (Why it’s discouraged)
• Bean Lifecycle (Creation, Initialization, Destruction)
• XML Config vs Java Config vs Annotation Config
• Spring Context Refresh Cycle (Internals)

FAANG Focus:

You must know the full bean lifecycle including:

• Instantiation (Reflection)