Spring Boot 4 + Spring Security 7 demo: Google OAuth 2.0 / OpenID Connect authentication

Microservice using OAuth 2.0 and OpenID Connect to authenticate with Google and get user information.

Technology stack:

• Java 17+
• Maven
• Spring Boot 4.0
• Spring Security 7
• OAuth2 Client
• AngularJS, HTML, CSS

1. Register your app in Google Cloud Console:

• Go to https://console.cloud.google.com and login with your Google account
• Create a new project or select an existing one
• Navigate to "APIs & Services" → "Credentials" → "Create Credentials" → "OAuth client ID"
• Application Type: "Web Application"
• Authorized redirect URIs: http://localhost:8181/login/oauth2/code/google
• Copy the Client ID and Client Secret

2. Configure the application:

Copy the example config and add your credentials:

cp src/main/resources/application-local.yml.example src/main/resources/application-local.yml

Edit application-local.yml with your Client ID and Client Secret.

3. Run the application:

mvn spring-boot:run -Dspring-boot.run.profiles=local

Alternative: use environment variables instead of application-local.yml:

export GOOGLE_CLIENT_ID=your-client-id
export GOOGLE_CLIENT_SECRET=your-client-secret
mvn spring-boot:run

4. Open browser:

Navigate to http://localhost:8181

Click "Google Login" to authenticate with your Google account.