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Application Security for Java Developers

Copyright (C) 2025 Ionut Balosin

This project is licensed under the Apache License, Version 2.0. Please see the LICENSE file for full license.

API and Microservices Security

⏰ 40 minutes

👨‍💼 Conducted By Trainer

📖 Informational: Software Architecture Diagram

This software architecture diagram for the Pizza distributed application highlights key security aspects, including OAuth 2.0 flows (e.g., Token introspection, JWKS) and endpoint roles checks.

🏋️ Hands-On Demo

Note: Please ensure that the Docker daemon is running; otherwise, the commands will not execute successfully.

  1. Open a terminal and start the Pizza application, which includes multiple microservices running in Docker, by using the following command:

    ./bootstrap-pizza-application.sh

  2. Next, open Postman and import the Postman collections.

  3. From the provided Postman collections, choose one of the following OAuth 2.0 flows to obtain a proper JWT token:

    • Password Flow
    • Client Credentials Flow
    • Authorization Code Flow with PKCE (using the credentials demo_user:Test1234!) (recommended)

  4. Finally, initiate a pizza order request using the endpoint POST /pizza/orders. If the command succeeds, the response should be 201 Created.

  5. To view further request processing details, open the console logs of each Docker container by running:

    docker logs -f <CONTAINER_ID>

    where <CONTAINER_ID> can be retrieved by running:

    docker ps -a

  6. Additionally, to better understand the Token Introspection, JSON Web Key Set, and roles-based access control implementations, please check out the following modules: