Example Project for Security in Spring Boot and Microservices

In this project I'm demonstrating you the most interesting features of Spring Cloud Project for building microservice-based architecture.

I'm publishing on my blog and maintaining example repositories just as a hobby. But if you feel it's worth donating:

1. How to renew certificates in your Spring Boot apps on Kubernetes with Cert Manager and Stakater Reloader. The example is available in the branch master. A detailed guide may be found in the following article: Renew Certificates on Kubernetes with Cert Manager and Reloader
2. How to reload SslBundles with Spring Boot and run the apps on Kubernetes. A detailed guide may be found in the following article: Spring Boot SSL Hot Reload on Kubernetes
3. How to use OAuth2 with Spring Cloud and integrate Spring Boot app with Keycloak. A detailed guide may be found in the following article: Microservices with Spring Cloud Gateway, OAuth2 and Keycloak
4. How to use SAML2 with Spring Boot and integrate it with Keycloak through the OpenSAML Shibboleth library. A detailed guide may be found in the following article: Spring Boot with SAML2 and Keycloak

Getting Started

SSL

To access an example with Spring Boot SSLBundle go to the ssl directory.
First, run the secure-callme-bundle app:

cd ssl/secure-callme-bundle
mvn spring-boot:run

First, run the secure-caller-bundle app:

cd ssl/secure-caller-bundle
mvn spring-boot:run

Then call the endpoint exposed by the with the curl command:

curl https://localhost:8444/caller/ping --insecure

SAML2

To access an example with Spring Boot SAML 2.0 example go to the saml directory.
First, run the Keycloak container:

cd saml
docker compose up

Once the Keycloak is started go to callme-saml and run the app:

cd callme-saml
mvn spring-boot:run

OAuth2

To access an example with Spring Boot OAuth2 example go to the oauth directory.
While building the gateway app it runs Testcontainer with Keycloak and simulates a downstream service:

cd oauth/gateway
mvn clean package