Spring Boot Keycloak Authentication Demo

This is a simple Spring Boot application that demonstrates how to implement authentication and authorization using Keycloak.

Prerequisites

Before you can run this application, you need to have the following prerequisites installed on your machine:

• Java 17 or later
• Maven 3.6 or later
• Keycloak 18.0 or later

Setup

1. Clone this repository to your local machine: git clone https://github.com/your-username/spring-boot-keycloak-demo.git

2. Navigate to the project directory: cd spring-boot-keycloak-demo

3. Start Keycloak: kb.bat or kb.sh (depending on your operating system) start-dev -Djboss.http.port=8100

4. Import the realm-export.json file into Keycloak:

   • Open the Keycloak admin console at http://localhost:8080/auth/admin
   • Log in as the admin user (username: admin, password: admin)
   • Click on "Add realm" and select "Import realm"
   • Select the realm-export.json file from the project directory and click "Create"

5. Build and run the application: mvn spring-boot:run

6. Test the application:

• Open a web browser and navigate to http://localhost:8081
• You should be redirected to the Keycloak login page
• Log in with one of the predefined users (username: user1 or user2, password: password)
• You should be redirected back to the home page and see a welcome message with your username

Configuration

The application is configured to use the keycloak realm in Keycloak. The realm-export.json file contains the predefined users and roles used in this demo.

The application properties are defined in the application.properties file: