Local OAuth2.0 Authorization Server Tutorial (2025) | Java 21 + Spring Security + JWT + DB + Session
Learn how to build a Local OAuth2.0 Authorization Server using Spring Security, Java 21, JWT, session authentication, and database connectivity — all using the latest 2025 Spring Boot & Spring Authorization Server updates.
In this step-by-step tutorial, we set up:
✔ Local OAuth2.0 Authorization Server
✔ Custom Login Page (username + password)
✔ Database-backed user authentication
✔ MySQL/PostgreSQL integration
✔ JWT access tokens + refresh tokens
✔ Session-based login support
✔ Client registration
✔ Secure OAuth2 flows (Authorization Code, Token)
✔ Modern Spring Security configurations (Java 21 compatible)
This tutorial uses:
• Spring Boot 4.x
• Spring Authorization Server (latest release)
• Java 21
• Spring Security 6+
• MySQL/PostgreSQL
• OAuth2 Client + Resource Server setup (optional) - upcoming videos
🔥 What You’ll Learn in This Video
✔ How OAuth2.0 Authorization Server works
✔ How to build an OAuth2.0 auth server locally
✔ How to create custom login with Spring Security
✔ How to store users in database (MySQL/PostgreSQL)
✔ How JWT generation + validation works in OAuth2.0
✔ How session authentication works
✔ How to register OAuth2 clients
✔ How to secure APIs using access tokens
✔ How Spring Security 2025 authorization flows work
Whether you're a Java developer, Spring Boot learner, or backend engineer, this project gives you real-world authentication skills.
👨💻 Technologies Used
Spring Boot • Spring Security • Spring Authorization Server • OAuth2.0 • JWT • Java 21 • MySQL • PostgreSQL • IntelliJ IDEA • Maven
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