📘 Spring Framework Complete Roadmap.

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🟢 Spring Framework Core

Introduction

• Overview of Spring Framework
• Why Spring is used

Message From Faisal

• Course overview / motivation

Tight and Loose Coupling

• Tight Coupling: Direct dependency between classes
• Loose Coupling: Uses abstraction (interfaces)

Dependency Injection (DI)

• Inject dependencies instead of creating them
• Types:
  • Constructor Injection
  • Setter Injection

Intro to Web Framework & Spring Framework

• What is a Web Framework?
• Why Spring?

Spring Concepts

• IOC (Inversion of Control)
• Beans
• Application Context

Setting up a Spring Project

• Using Maven / Gradle
• Project structure

Build Tools: Maven & Gradle

• Dependency management
• Build lifecycle

Creating Your First Bean

• Define and use a bean

Challenge: Manual DI → Spring DI

• Convert traditional object creation to Spring

IOC, DI & Problem Spring Solves

• Removes tight coupling
• Improves maintainability

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🟢 Annotations & Layered Architecture

Problems with Manual Config

• XML complexity
• Maintainability issues

Core Annotations

• @Component
• @ComponentScan
• @Configuration

@Autowired

• Automatic dependency injection

Stereotype Annotations

• @Service
• @Repository
• @Controller

Multiple Implementation Problem

• Solutions:
  • @Primary
  • @Qualifier

Bean Lifecycle

• Initialization → Usage → Destruction

Mixing @Bean & @Component

• Java config + Annotation config

Layered Architecture

• Controller → Service → Repository

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🟢 Spring Boot Introduction

What is Spring Boot?

• Auto configuration
• Embedded server

Creating a Project

• Spring Initializr

Spring Boot Starters

• Predefined dependencies

application.properties

• Configuration file

CommandLineRunner / ApplicationRunner

• Run code at startup

Interview Questions

• Common concepts

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🟢 First REST API

Introduction to REST

• REST principles

Create First API

• Basic controller

HTTP Methods & Status Codes

• GET, POST, PUT, DELETE

JSON Response

• Object → JSON

@RequestMapping

• Map HTTP requests

Request Flow

• DispatcherServlet → Controller → Service

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🟢 POST, PUT, DELETE

Data Modification APIs

• CRUD operations

POST

• Create data

PUT

• Update data

DELETE

• Remove data

ResponseEntity

• Control response & status codes

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🟢 Path Variables & Query Params

Dynamic URLs

• Passing data in URL

Path Variables

• @PathVariable

Query Parameters

• @RequestParam

Multiple Parameters

• Handle multiple inputs

@RequestHeader

• Access headers

Combine All

• Use together in one API

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🟢 Exception Handling & Logging

Exceptions in Spring Boot

• Runtime error handling

Service Layer Structure

• Clean architecture

Inbuilt Exception Handling

• Default exceptions

@ExceptionHandler

• Handle specific errors

Global Exception Handling

• @RestControllerAdvice

Custom Exceptions

• User-defined errors

Logging

• Levels:
  • INFO
  • DEBUG
  • ERROR

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🟢 JDBC Fundamentals

Why JDBC?

• Understand database basics

Setup with MySQL

• Add dependency

Database Connection

• Establish connection

Try-with-Resources

• Auto close resources

CRUD Operations

• INSERT
• SELECT
• UPDATE
• DELETE

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🟢 Transactions & Prepared Statements

PreparedStatement

• Prevent SQL Injection

Transactions

• Group operations

Commit & Rollback

• Maintain consistency

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🟢 Hibernate & ORM

ORM Introduction

• Object Relational Mapping

JPA vs JDBC

• Abstraction vs manual SQL

Hibernate Architecture

• Session
• SessionFactory

Hibernate Project

• CRUD operations

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🟢 Spring Boot + JPA Integration

JPA Deep Dive

• Advanced concepts

EntityManager

• Core JPA operations

Spring Boot Integration

• Combine with Spring Boot

Layered Structure

• Controller → Service → Repository

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🟢 JPA Relationships

Why Relationships?

• Connect tables

One-to-One

• Single mapping

One-to-Many / Many-to-One

• Parent-child relation

Many-to-Many

• Multiple connections

Cascading

• Auto save/update/delete

Level Up

• Advanced mappings

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🚀 Final Goal

• Build production-ready Spring Boot applications
• Master REST APIs, JPA, and backend architecture