294 lines (197 loc) · 4.39 KB

📘 Spring Framework Complete Roadmap.

🟢 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

🟢 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

🟢 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

🟢 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

🟢 POST, PUT, DELETE

Data Modification APIs

CRUD operations

POST

Create data

PUT

Update data

DELETE

Remove data

ResponseEntity

Control response & status codes

🟢 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

🟢 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

🟢 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

🟢 Transactions & Prepared Statements

PreparedStatement

Prevent SQL Injection

Transactions

Group operations

Commit & Rollback

Maintain consistency

🟢 Hibernate & ORM

ORM Introduction

Object Relational Mapping

JPA vs JDBC

Abstraction vs manual SQL

Hibernate Architecture

Session
SessionFactory

Hibernate Project

CRUD operations

🟢 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

🟢 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

🚀 Final Goal

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