🚀 Master Keycloak + Spring Boot 3 Security | 90-Min Production OAuth2 Project 2026

🚀 *Master Enterprise Security: Get my free guide to securing 3 Spring Boot endpoints in 30 minutes:* https://learnwithiftekhar.kit.com/secure-your-api-in-30-minutes 💼 Need expert help with your backend? I offer 1-on-1 architecture consulting and freelance development for enterprise Java/Spring Boot projects. Let's talk: learnwithiftekhar@gmail.com In this comprehensive tutorial, we go beyond surface-level setup to build a fully secure Spring Boot 3 application using Keycloak and OAuth2. You will learn how to configure Keycloak via Docker, customize the Spring Security login flow, properly manage multi-system user sessions (OIDC logout), and implement fine-grained Role-Based Access Control (RBAC) by extracting custom roles from Keycloak's JWT claims. 🔗 Resources & Code: 💻 Get the Full Source Code: https://github.com/learnwithiftekhar/ 💬 Join the Discord Community: https://discord.gg/JZmFvSxw 📺 *Related Architecture Deep Dives:* ► Spring Boot Rate Limiting (Prevent DDoS): https://www.youtube.com/watch?v=7dVehIwAB-s ► Implement MFA in Spring Boot with Google Authenticator: https://www.youtube.com/watch?v=gfb6-BvjGwk ► Master programming by recreating tools: https://app.codecrafters.io/join?via=learnwithiftekhar Contents 00:00:00 Intro 00:00:42 Installing Keycloak 00:05:11 Keycloak Admin Configuration 00:07:55 Understanding Realms 00:10:25 Creating Client in Keycloak 00:14:30 Creating Roles (Admin, Manager, User) 00:15:27 Creating Users & Assigning Roles 00:19:52 Spring Boot Project Setup 00:24:23 Adding OAuth2 & Keycloak Configuration 00:29:05 First Login with Keycloak 00:31:12 Customizing Spring Security Configuration 00:33:51 Custom Login Page in Spring Boot 00:37:28 Styling Login Page with Tailwind 00:41:41 Building Home Page 00:50:19 Understanding Session & Logout Behavior 00:51:24 Implementing Proper Keycloak Logout 00:54:16 Creating Role-Based Dashboards 01:06:09 Role-Based Access Control (RBAC) 01:09:06 Why Roles Not Working (Deep Dive) 01:12:32 Extracting Roles from Access Token 01:24:50 Showing UI by Role 01:26:18 Final Demo & Wrap-Up Let's Connect: LinkedIn: https://www.linkedin.com/in/hossain-md-iftekhar/ X/Twitter: https://twitter.com/ifte_hsn