Spring Tech Stack

📘 Table of Contents

🌱 Spring Framework

Introduction

  • What is Spring?
  • Features and advantages
  • Spring modules overview

Core Concepts

  • IoC and DI
  • Bean lifecycle, scopes
  • Autowiring and annotations

Configuration

  • XML vs Annotation
  • Java config and profiles

AOP

  • Concepts and use cases
  • Pointcuts, advices, aspects

⚡ Spring Boot

Introduction

  • Need for Spring Boot
  • Differences from Spring Framework

Project Setup

  • Spring Initializr
  • Maven/Gradle

Core Features

  • Auto configuration
  • Profiles and external configs
  • Embedded servers

REST APIs

  • Controllers, CRUD operations
  • Exception handling
  • Request validation

Testing

  • JUnit, Mockito

☁️ Spring Cloud

Overview

  • Challenges in microservices
  • Spring Cloud components

Config Server

  • Central config with Git
  • Client integration

Service Discovery

  • Eureka Server
  • Client registration

Load Balancing

  • Ribbon
  • REST + Feign clients

Circuit Breakers

  • Hystrix/Fallbacks

API Gateway

  • Spring Cloud Gateway
  • Filters and routing

🧩 Spring Microservices

Architecture

  • Monolith vs Microservices
  • Service granularity

Design

  • DDD basics
  • RESTful design practices

Implementation

  • Stateless services
  • Inter-service communication

Security

  • Spring Security
  • JWT + OAuth2

Event-Driven Approach

  • Kafka or RabbitMQ
  • Async communication

🗃️ Spring Data JPA

Introduction

  • What is Spring Data JPA?
  • Repository pattern

Entity Mapping

  • @Entity, @Id, @OneToMany
  • Relationships and FetchType

Queries

  • Derived query methods
  • JPQL and native queries

Pagination & Sorting

  • PageRequest
  • Sorting using Sort class

🛠️ Hibernate Framework

ORM Basics

  • Introduction to ORM
  • Hibernate vs JPA

Configuration

  • Hibernate.cfg.xml
  • SessionFactory, Sessions

Entity Mapping

  • One-to-one, many-to-many
  • Lazy vs Eager fetching

Queries

  • HQL, Criteria API
  • Named and native queries

Caching and Transactions

  • Transaction management

🐳 Docker

Introduction

  • What is Docker?
  • Benefits of containers

Docker Basics

  • Dockerfile
  • Docker CLI

Dockerize Spring Boot

  • Create Dockerfile
  • Build image and run

Docker Compose

  • Defining services
  • Networking and volumes

Docker in CI/CD

  • Using Docker in Jenkins
  • GitHub Actions

🔐 Security with Spring and JWT

Introduction to Spring Security

  • What is Spring Security?
  • Security filters and architecture

Authentication and Authorization

  • Basic vs Form login
  • Custom user details service
  • Role-based access control

JWT (JSON Web Token) Authentication

  • What is JWT?
  • JWT structure and flow
  • Generating and validating tokens

Implementing JWT in Spring Boot

  • Secure login endpoint to generate token
  • Filter to validate JWT in incoming requests
  • Stateless authentication flow

📚 Microservice Project 1 - Book Management System

🎯 Objective:

Build a microservices-based system to manage books, authors, and reviews.

🧩 Microservices:

  • 📖 Book Service: CRUD operations for books
  • 🧑‍💻 Author Service: Manage author details
  • ⭐ Review Service: Add and fetch reviews

🛠️ Tech Stack:

  • Spring Boot, Spring Data JPA
  • Spring Cloud Eureka, Config Server
  • Spring Cloud Gateway
  • Docker + Docker Compose
  • PostgreSQL or MongoDB

✨ Features:

  • REST APIs for CRUD
  • Service Discovery with Eureka
  • API Gateway with Spring Cloud Gateway
  • Centralized configuration
  • Inter-service communication using Feign
  • JWT-based authentication

🛒 Microservice Project 2 - Online Order Processing System

🎯 Objective:

Develop an order management platform for a simple e-commerce flow.

🧩 Microservices:

  • 📦 Product Service: Manage products
  • 📋 Order Service: Place and manage orders
  • 💳 Payment Service: Handle payments
  • 📢 Notification Service: Send order updates via email (mock service)

🛠️ Tech Stack:

  • Spring Boot, Spring Cloud
  • Kafka / Queue (for event-driven architecture)
  • Spring Security + JWT
  • Docker and Docker Compose
  • MySQL for persistence

✨ Features:

  • REST endpoints for each service
  • Kafka / Queue integration for async updates
  • Fault tolerance with Hystrix
  • Distributed tracing with Sleuth and Zipkin
  • Swagger/OpenAPI documentation