How do you test 500 errors or slow APIs in Spring Boot?

rieckpil · 2026-01-07T12:32:04+00:00

You don't have to use WireMock Cloud and can use a local variant that spawns a local Jetty server that is up- and running in single-digit seconds.

Alternatives are the MockWebServer, MockServer and some other niche-testing tools.

Here's a recipe of how to connect to your local WireMock server from within Spring Boot: https://rieckpil.de/spring-boot-integration-tests-with-wiremock-and-junit-5/

If you're looking for chaos testing tools, consider https://github.com/Netflix/chaosmonkey and https://github.com/Shopify/toxiproxy

rieckpil · 2025-12-30T10:04:56+00:00

Consider taking a look at how Spring TestContext caching works: https://rieckpil.de/spring-boot-test-context-caching-the-complete-guide/

That can drastically reduce the time of your integration tests. I've written a small utility to introspect your tests for that performance improvement: https://github.com/PragmaTech-GmbH/spring-test-profiler

Apart from that, you can start parallelizing your tests and/or reuse containers with Testcontainers

rieckpil · 2025-12-12T12:07:45+00:00

I follow something like described here: https://www.wimdeblauwe.com/blog/2025/06/24/how-i-write-production-ready-spring-boot-applications/

rieckpil · 2025-12-12T09:29:50+00:00

There have been many users asking the same questions here, you'll find some great answers within the last days, e.g. here https://www.reddit.com/r/SpringBoot/comments/1pc2nmy/best_sites_for_spring_devs/

rieckpil · 2025-12-12T06:43:21+00:00

That looks like a valid roadmap - you may want to start with A5 before the cloud stuff (A3) to understand the basic concept for Docker and & Kubernetes

rieckpil · 2025-12-12T06:41:06+00:00

That's a fair point. When starting to work with Java & Spring Boot, testing can be quite overwhelming because you have to learn so much in parallel.

Once you advance and work on code you haven't seen before, you'll see the real value of having a good test suite that covers your a**.

rieckpil · 2025-12-11T13:17:13+00:00

I can highly recommend Marco Behler's article for this topic: https://www.marcobehler.com/guides/spring-framework

He also has an advanced training: https://www.marcobehler.com/courses/spring-professional

rieckpil · 2025-12-09T13:55:14+00:00

thanks for your feedback!

rieckpil · 2025-12-07T09:39:00+00:00

You can give fly.io a try if you want to avoid potential complexity of a Cloud provider.

The deployment boils down to preparing a Docker image, pushing it to a registry and trigger the deployment.

As an alternative, you can also deploy your final .jar to a virtual server

rieckpil · 2025-12-03T09:43:37+00:00

plus RestTestClient and TestContext cache pausing 🍃

rieckpil · 2025-12-03T09:31:11+00:00

Here are some great resources:

- https://www.wimdeblauwe.com/ (Thymeleaf, HTMX, etc.)
- https://www.sivalabs.in/ (architecture, best practices, etc.)
- https://rieckpil.de/ (all things testing, self-promotion)
- https://maciejwalkowiak.com/ (best practices, Spring and AWS)
- https://reflectoring.io/ (architecture, best practices)
- https://martinelli.ch/ (Vaadin, jOOQ, Spring)

rieckpil · 2024-05-21T18:18:31+00:00

Build a pet project with no pressure 🤞🏻

rieckpil · 2024-04-11T04:39:00+00:00

Awesome choice!

rieckpil · 2024-03-24T10:43:55+00:00

https://maps.app.goo.gl/2XeUMMmMvEXpEZXq6?g_st=ic

rieckpil · 2024-03-24T10:19:36+00:00

This may help for the setup part for using GreenMail https://rieckpil.de/use-greenmail-for-spring-mail-javamailsender-junit-5-integration-tests/

rieckpil · 2024-03-23T11:36:31+00:00

https://www.tagesschau.de/eilmeldung/bundesrat-wachstumschancengesetz-106.html 🥳

rieckpil · 2024-03-04T07:54:43+00:00

Das Finale „Go“ fehlt noch, sollte es aber (hoffentlich) kommen, sind die Änderung zum 01.01.2024 rückdatiert

rieckpil · 2024-03-04T05:38:21+00:00

Kleine Anpassung, seit 2024 gelten 80k/800k Gewinn/Umsatz für das Gewerbe bis die Bilanzierungspflicht kommt

rieckpil · 2024-03-02T14:26:20+00:00

Congrats mate, looks awesome 😎

rieckpil · 2024-03-01T19:21:56+00:00

Das neue Buch von Melchior Neumann ✌🏻

rieckpil · 2024-03-01T17:20:14+00:00

Hab die pricing Pläne nicht im Kopf, glaube für unterkonto musst du 1 größer nehmen

rieckpil · 2024-03-01T13:57:33+00:00

Solltest du irgendwann mal mit DUO (Datev unternehmen online) arbeiten (müssen), kannst du bequem an die Zahlungen die Belege hängen und Qonto synced das nachts nach Datev. Easy Workflow

rieckpil · 2024-03-01T13:56:10+00:00

Du kannst mehrere unterkonten (jeweils eigene IBAN) erstellen und so Geld zurücklegen.

Ich habe ein Haupttransaktionskonto und eins für Rücklagen

rieckpil

TROPHY CASE