Quarkus and WireMock. Dev Services for your projects

Quarkus offers many local development capabilities, including the recently released Dev Services that usually run with Testcontainers under the hood. We can leverage Dev Services to provide real-time API provider development experiences for Quarkus-based services and client apps.

In this session, I provide an overview of using Quarkus and its Dev Services in Gradle projects. We take WireMock as an example. I will demonstrate how to develop a REST API and a gRPC 3-tier client-service-database application using Quarkus and WireMock. DM for a Testcontainers edition!

Demo with Apache Maven: https://github.com/wiremock/wiremock-quarkus-devservice-demo
Demo with Gradle Build Tool: https://github.com/oleg-nenashev/gradle-quarkus-plugin-demo

NOTE: This presentation was modified on Oct 10, 2025, to exclude the IP of Gradle Inc. Extended introduction, Quarkus Plugin for Gradle Build Tool, and the respective demo details are no longer included in the slides.

Copyright Notice: Gradle, Inc. Gradle®, Develocity®, Build Scan®, and the Gradlephant logo are registered trademarks of Gradle, Inc. "Gradle" means "Gradle Build Tool" and does not reference Gradle, Inc. and/or its subsidiaries

Transcript

1. Oleg Nenashev @oleg_nenashev
2. NOTE: • This presentation was modified on Oct 10, 2025, to exclude IP of Gradle Inc. • Quarkus Plugin for Gradle Build Tool is no longer included in slides • Gradle®, Develocity®, Build Scan®, and the Gradlephant logo are registered trademarks of Gradle, Inc. "Gradle" means "Gradle Build Tool" and does not reference Gradle, Inc. and/or its subsidiaries. Former Edition at Türkiye Java Community, May 2024:
3. > whoami @oleg_nenashev oleg-nenashev Dr. Nenashev / Mr. Jenkins Developer tools hacker Community builder FOSS/DevRel consultant #RussiansAgainstPutin #StandWithUkraine
4. speakerdeck.com/onenashev
5. 5 rts.ch/info/regions/neuchatel/12836885-la-population-neuchateloise-en-hausse-malgre-un-recul-dans-les-montagnes.html
6. My Open [and not so] Communities Time * Once a contributor, [almost] always a contributor Neuchâtel
7. > whoami --quarkus • Jenkins on Quarkus experiments • Jenkinsfile Runner native exec with Quarkus • FaaScinator pet project 7
8. wiremock.org wiremock.org
9. > whoami --quarkus • Jenkins on Quarkus experiments • Jenkinsfile Runner native exec with Quarkus • FaaScinator pet project • WireMock Dev Service 9
10. speakerdeck.com/onenashev/developing-apps-with-quarkus-and-wiremock Presented at customer/ community meetings Soon: JCON, JUG.ch
11. Quarkus is great for building REST APIs 11 • Built-in support • Many extensions • Developer experience code.quarkus.io
12. APIs
13. 13 Source: https://medium.com/10-minutes-qa-story/api-testing-from-scratch-api-anatomy-f220856ce9b3
18. Ways to do API integration testing 1. Testing against Production/Staging servers 2. Testing against a simplified/containerized instance (e.g. Testcontainers) 3. Modeling (aka Mocking) at the API provider level (e.g. WireMock or Microcks) 4. Mocking at the code level by instrumenting it (Mockito, PowerMock) 18 Slow Fast Nope Accu- rate * For Testcontainers, see the slides
19. 19 wiremock.org/docs/stubbing IF (request_url) THEN (response) * * it gets MUCH more complex WireMock Config JSON: Client library response request Client App Mock API Server HTTP/2 API Mocking 101
20. API Mocking for Quarkus 20 Main implementation in Java Native lib, Docker images and Testcontainers modules Support for GraalVM Unofficial Quarkus Dev Service Sandbox CNCF Project Golang / Microservice arch Docker image, Testcontainers module Unofficial Quarkus Dev Service
21. 21 Staging & QA Tests Build Integration tests Build Tests Gaining confidence in you software “Shift Left”
22. WireMock Ecosystem & Features 22 wiremock.org/docs
23. WireMock Ecosystem & Features 23 wiremock.org/docs
25. 25 Quarkus Dev Services Powered By: • Quarkus Extensions • Quarkus Extensions + Testcontainers • Compose Specification: https://compose-spec.io Quarkus supports the automatic provisioning of unconfigured services in development and test mode. We refer to this capability as Dev Services
26. Quarkus Dev Services Configuration in application.properties 26
27. Quarkus Dev Services May be complex runtimes, with UI, etc. 27
28. 28 docs.quarkiverse.io/quarkus-wiremock/dev/index.html
29. 29 docs.quarkiverse.io/qu arkus-wiremock/dev/in dex.html#extension-co nfiguration-reference
30. Code-only Mode 30 docs.quarkiverse.io/quarkus-wiremock/dev/index.html
31. github.com/wiremock/wiremock-quarkus-devservice-demo
32. Resource Definition 32
33. @QuarkusTest or @QuarkusIntegrationTest 33
34. And a Quarkus Dev Service! docs.quarkiverse.io/quarkus-wiremock/dev/index.html 34
36. What I’m looking forward to? • Feedback on tools we used • Promoting WireMock and Microcks Dev Services as official ones • Quarkus developer experiences 36
37. References My demo: • with Apache Maven: github.com/wiremock/wiremock-quarkus-devservice-demo • with Gradle Build Tool: github.com/oleg-nenashev/gradle-quarkus-plugin-demo WireMock extension for Quarkus: • https://docs.quarkiverse.io/quarkus-wiremock • https://github.com/gscaramuzzino/quarkus-wiremock-testing • https://quarkus.io/guides/getting-started-testing#quarkus-test-resource 37
38. GitHub: oleg-nenashev Twitter: @oleg_nenashev QUESTIONS? Quarkus on Zulip, https://quarkusio.zulipchat.com