Spring Boot 3, Spring Security, and Keycloak

Purpose

A sample java code to demonstrate a Spring Boot 3 integration with Keycloak 17. It utilize Keycloak login page, and fetch a user's attribute based on Keycloak user profile.

Version

• Spring Boot 3.0.4
• Keycloak 23
• Red Hat OpenJDK 17
• Grafana
• Prometheus

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Screenshots

Keycloak User Profile

JSON Response reading Keycloak Profile

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Blog Post

Explanation of this code can be seen on below Red Hat Developer article,

https://developers.redhat.com/articles/2023/07/24/how-integrate-spring-boot-3-spring-security-and-keycloak

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Keycloak with PostgreSQL, which includes Keycloak's monitoring using Prometheus and Grafana

1. Requires docker and compose
2. Parameterized using variables in the .env file
3. Up the project using command:

docker compose up -d

App	Port	Username	Password
Keycloak	8080	admin	keycloak
Prometheus	9090
Grafana	3000	admin	grafana
Gitlab	8084	root	brIyDjJaiZvEwxH43nOMZvd379vbbd/LMkKxkAsmd+U=

Useful commands	Discription
docker stats	Containers resource usage (--no-stream only pull the first result)
docker compose logs	Shows logs of containers (-f to follow logs)
docker compose down	Stop and remove containers (-v remove named volumes declared in the volumes section of the Compose file and anonymous volumes attached to containers)
docker system prune -a -f	Remove all unused containers, networks, images (--volumes prune volumes)
docker exec -it gitlab-ce grep 'Password:' /etc/gitlab/initial_root_password	Find Gitlab root user
`export DOCKERHOST=$(ifconfig	grep -E "([0-9]{1,3}.){3}[0-9]{1,3}"

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Disclaimer

This code is provided "as is" without any guarantee whatsoever. 
Feel free to fork, add, remove, change, or do whatever you want with it.