Spring Petclinic is a Spring Boot application built using Maven or Gradle. You can build a jar file and run it from the command line (it should work just as well with Java 17 or newer): ...

An example/reference implementation of Ory Hydra in Java with SpringBoot. Shows the basicis of OAuth2 integraiton with OIDC. Includes a full suite of integration tests using Testcontainers ...