Spring Learning Journey

This repository contains my notes for learning the Spring Framework, as well as key concepts related to Object-Oriented Design, Design Patterns, and Software Architecture.

It also includes mini-projects that I will develop to learn Spring

I'm following these 2 resources:

1. Java Spring Framework 6 with Spring Boot 3 with Telusko (Udemy course)

2. Spring Start Here: Learn what you need and learn it well by Laurentiu Spilca (Book)

NOTE: These mini-projects are self-created for additional practice and are not directly provided by the course or the book

Spring Mini Projects

Spring Framework Introduction

• Project: Simple Dependency Injection Demo
• Description: Create a basic console application demonstrating Dependency Injection (DI) using XML configuration, annotations, and Java-based configuration.
• Dependencies: None (Core Spring only).
• Instructions:
  • Set up a new Maven project.
  • Create a configuration class with @Configuration annotation.
  • Define beans using @Bean method.
  • Demonstrate DI using a simple MessageService.

Working with Java-Based Configuration

• Project: Basic Calculator Application
• Description: Build a console-based calculator using Spring Beans configured with Java configuration (no XML).
• Dependencies: None (Core Spring only).
• Instructions:
  • Create a CalculatorService class with methods for addition, subtraction, etc.
  • Use @Configuration and @Component to configure beans.
  • Demonstrate usage with a main application class.

Spring Boot

• Project: Greeting API
• Description: Create a Spring Boot application with an HTTP endpoint that returns a greeting message.
• Dependencies: Spring Boot Starter Web.
• Instructions:
  • Create a Spring Boot project using Spring Initializr.
  • Add a controller with a @GetMapping for the greeting.
  • Test the API using a browser or Postman.

Spring JDBC

• Project: Student Management Console App
• Description: Develop a console application that uses Spring JDBC for CRUD operations on a Student database.
• Dependencies: Spring JDBC, H2 Database (or MySQL).
• Instructions:
  • Create a Student class and a StudentDAO interface.
  • Implement the DAO using JdbcTemplate.
  • Test CRUD operations using console input/output.

Spring Boot Web

• Project: Online Book Store (Basic)
• Description: Build a Spring Boot web application with a simple homepage listing book titles and an "Add Book" form.
• Dependencies: Spring Boot Starter Web, Thymeleaf.

Spring AOP

• Project: User Activity Logger
• Description: Add a logging aspect to an existing application that tracks user actions using Aspect-Oriented Programming (AOP).
• Dependencies: Spring Boot Starter AOP.
• Instructions:
  • Create an Aspect class using @Aspect annotation.
  • Add pointcuts for logging method calls.

Spring Security

• Project: Secure User Portal
• Description: Build a web app with user authentication using Spring Security.
• Dependencies: Spring Boot Starter Security.
• Instructions:
  • Configure security settings (in-memory users initially).
  • Add role-based access control.

JWT and OAuth2

• Project: Secure REST API with JWT
• Description: Secure your REST API with JWT for authentication.
• Dependencies: Spring Boot Starter Security, JWT.

Docker

• Project: Containerized Spring Boot Application
• Description: Dockerize a Spring Boot application.
• Dependencies: Docker.

Cloud Deployment

• Project: Deploy API to AWS
• Description: Deploy a Spring Boot app to AWS Elastic Beanstalk.
• Dependencies: AWS CLI, AWS Elastic Beanstalk.

Microservices

• Project: E-commerce Microservices Application
• Description: Build a system with Product, Order, and Payment microservices.
• Dependencies: Spring Cloud, Eureka, Feign, Gateway.

Spring AI

• Project: AI-Powered Chatbot API
• Description: Build a chatbot API using OpenAI API integrated with Spring Boot.
• Dependencies: OpenAI API, Spring Boot Starter Web.