Sample Application for the Javaland 2026 "Raus aus der Mocking-Hölle"

This repository contains the code for conference talk "Raus aus der Mocking-Hölle" presented at Javaland March 10th 2026. It contains a Spring Boot sample application and various unit tests show-casing the difference between layered and CQRS-style architectures, to emphasize the advantages of testing, when using the latter one.

A JDK 21+ and Docker is required to start the sample application as follows:

./gradlew bootRun

The application is listening on port 8080 and its REST API can be executed using http://localhost:8080/swagger-ui/index.html or via the Bruno collection.

The relevant test cases used within the talk are:

• BookServiceTest (layered)
• BookLendingTest (CQRS)
• EmailHandlerTest (Unit)

All tests can be executed using:

./gradlew check

Feel free to contact us via mail, if you have questions and/or feedback: frank.scheffler(at)digitalfrontiers.de or nikolai.neugebauer(at)digitalfrontiers.de.