Spring Boot Backend Learning

This repository represents my structured backend development learning journey using Spring Boot.
It follows real-world backend architecture and industry best practices with a strong focus on clean layering, maintainability, and scalability.

The repository is organized module-wise and day-wise, exactly how backend development is learned in real projects.

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Architecture Overview

Clean layered architecture followed across all modules:

Controller
→ Service
→ Repository
→ Database

Supporting layers:

• DTO (request / response)
• Entity (JPA mapping)
• Exception (global handling)
• Config (application & security config)

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Modules Covered

Spring Boot Basics

• Dependency Injection
• Constructor Injection
• Bean lifecycle
• Configuration & profiles

Spring MVC

• Controller & View flow
• Thymeleaf integration
• Form handling
• Path params & query params
• MVC mini project (CRUD)

Spring REST APIs

• RESTful CRUD APIs
• JSON request/response
• DTO based APIs
• Validation
• Global exception handling
• Pagination & sorting
• Swagger API documentation
• REST mini project (Tourist Management System)

Spring Data JPA

• Entity mapping
• One-to-Many & Many-to-One relationships
• JpaRepository
• Custom finder methods
• JPQL queries
• Pagination & File Upload
• MySQL integration
• Complete Food Order Management System (User + Admin modules)

Spring Security

• Authentication & Authorization
• SecurityFilterChain
• HTTP Basic Authentication
• Securing REST APIs
• Role based access
• JWT Authentication
• JWT Authentication + Role Based Access
• OAuth2 Login – Google & GitHub

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Project Structure

spring-boot-learning/ │ ├── springboot-basic/ │ ├── springboot-basic-day1 │ └── springboot-basic-day2 │ ├── mvc-architecture/ │ ├── springboot-mvc-day1 │ ├── springboot-mvc-day2 │ ├── springboot-mvc-day3 │ ├── springboot-mvc-crud-day4 │ └── mvc-mini-project │ ├── RESTful-APIs/ │ ├── rest-day1-basics │ ├── rest-day2-input │ ├── rest-day3-crud │ ├── rest-day4-json │ ├── rest-day5-validation │ ├── rest-day6-exception-handling │ ├── rest-day7-integration │ ├── rest-day8-swagger │ ├── rest-day9-pagination-search-upload │ └── Tourist-Management-System │ ├── Data-JPA/ │ ├── jpa-day1-basics │ ├── jpa-day2-crud │ ├── jpa-day3-pagination-sorting │ ├── jpa-day4-relationships │ ├── jpa-day5-custom-queries │ └── Food-Order-Management-System │ ├── Spring-Security/ │ ├── spring-security-day1-basic-auth │ ├── spring-security-day2-inmemory-auth │ ├── spring-security-day3-db-auth │ ├── spring-security-day4-jwt │ ├── spring-security-day5-jwt-advanced │ └── spring-security-day6-oauth │ └── docs/

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Documentation

Detailed learning notes and explanations are maintained separately inside the docs/ folder to keep the main README clean.

Each document contains:

• Concepts learned
• Why it is used
• How it is implemented
• Project references

docs/ │ ├── springboot-basic/ │ ├── springboot-basic-day1.md │ └── springboot-basic-day2.md │ ├── mvc-architecture/ │ ├── springboot-mvc-day1.md │ ├── springboot-mvc-day2.md │ ├── springboot-mvc-day3.md │ ├── springboot-mvc-crud-day4.md │ └── mvc-mini-project.md │ ├── RESTful-APIs/ │ ├── rest-day1-basics.md │ ├── rest-day2-input.md │ ├── rest-day3-crud.md │ ├── rest-day4-json.md │ ├── rest-day5-validation.md │ ├── rest-day6-exception-handling.md │ ├── rest-day7-integration.md │ ├── rest-day8-swagger.md │ ├── rest-day9-pagination-search-upload.md │ └── Tourist-Management-System.md │ ├── Data-JPA/ │ ├── jpa-day1-basics.md │ ├── jpa-day2-crud.md │ ├── jpa-day3-pagination-sorting.md │ ├── jpa-day4-relationships.md │ ├── jpa-day5-custom-queries.md │ └── Food-Order-Management-System.md │ ├── Spring-Security/ │ ├── spring-security-day1-basic-auth.md │ ├── spring-security-day2-inmemory-auth.md │ ├── spring-security-day3-db-auth.md │ ├── spring-security-day4-jwt.md │ ├── spring-security-day5-jwt-advanced.md │ └── spring-security-day6-oauth.md

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Learning Status

• Spring Boot Basics — Completed
• Spring MVC — Completed
• Spring REST APIs — Completed
• Spring Data JPA — Completed
• Spring Security — In Progress

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Tech Stack

Core

• Java 21
• Spring Boot 4.0.2
• Maven

Backend Frameworks

• Spring MVC
• Spring REST APIs
• Spring Data JPA
• Spring Security (in progress)

Tools

• MySQL
• Hibernate
• Swagger / OpenAPI
• Postman
• Git & GitHub

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Purpose

• Build strong backend fundamentals
• Learn Spring Boot the right industry way
• Maintain a clean, professional GitHub portfolio
• Prepare for backend internships & placements

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Note

This repository is backend-focused.
Frontend, JWT, OAuth2, and production security setups are added gradually as part of advanced modules.

Repository Status

This repository contains my structured Spring Boot backend learning journey covering core modules such as Spring MVC, REST APIs, Spring Data JPA, and Spring Security. The main goal of this repository is to build strong backend fundamentals and document the concepts learned during development. Major real-world backend projects built during this learning phase are maintained in separate repositories.