my blog. for you.

Let’s talk digital.

I’m an independent IT consultant and entrepreneur in the Internet and software business. I’m interested in design, enterprise applications, web apps and SaaS products. I design and develop business solutions and applications. I help companies in terms of software quality and knowledge transfer, e.g. with Angular and Spring Boot.

Taming Testing of AI Apps by Alex Soto @ Spring I/O 2025

Better Assertions With AssertJ by Tim te Beek @ Spring I/O 2025

Sunday September 21st, 2025 by Bjoern in Enterprise Software, Software

Testing Spring Boot @ConfigurationProperties

Making Configuration Properties Testable in Spring Boot One of Spring Boot’s most elegant features is its support for binding externalised configuration to strongly typed Java beans via @ConfigurationProperties. This makes managing application settings both expressive and maintainable. However, as with any other part of our code, we should ensure that these properties are tested — especially when they encapsulate non-trivial validation or logic. This Baeldung article on "Testing @ConfigurationProperties in Spring Boot" provides a comprehensive overview of how to do just that. The ...

Sunday May 18th, 2025 by Bjoern in Enterprise Software, Software

Secure, Test, Repeat: A Guide to Spring Security Integration Testing by Laurentiu Spilca @ Spring I/O 2024

Sunday May 11th, 2025 by Bjoern in Enterprise Software, Software

Automating Java Code Migration with OpenRewrite

Software development constantly evolves, and so do the libraries and frameworks we rely on. Keeping codebases up-to-date is crucial for long-term maintainability but often feels tedious and error-prone when done manually. Fortunately, tools like OpenRewrite offer an elegant solution: automating large-scale code changes in a reliable, repeatable way. In a recent article, Philip Riecks walks through a practical example of how OpenRewrite can be used to modernize Java code. Specifically, he demonstrates how to update outdated Mockito usage — migrating from the ...

Sunday May 4th, 2025 by Bjoern in Enterprise Software, Software

Testcontainers Support in Spring Boot

With SpringBoot 3.1, Spring Boot has introduced first-class support for Testcontainers during development time. Last year, Baeldung published an introductory article on how to use the now built-in Testcontainers support with Spring Boot.

Sunday March 16th, 2025 by Bjoern in General

Beyond Built-in: Advanced Testing Techniques for Spring Boot Applications by Michael Vitz @ Spring I/O 2024

Sunday September 8th, 2024 by Bjoern in Enterprise Software, Software

The Unknowns of JUnit 5 by Mike Kowalski @ Devoxx France 2022

Sunday March 31st, 2024 by Bjoern in Enterprise Software, Software

Spring Boot Tip: A Simplified Way of Creating ArgumentCaptors with Mockito 5.7.0

Martin Hock recently published this tip on a simplified way of creating Mockito ArgumentCaptors with Spring Boot 3.2.x: 💡 Mockito 5.7.0 (included in Spring Boot 3.2) introduced simplified way for creating argument captors: pic.twitter.com/MEdJ3dlwum— Maciej Walkowiak 🍃 (@maciejwalkowiak) December 13, 2023

Sunday January 7th, 2024 by Bjoern in Enterprise Software, Software

ArchUnit Spring Integration

ArchUnit is a tremendously useful library for enforcing Java application architecture via unit testing. Fellow software developer and consultant Roland Weisleder recently published a new library called ArchUnit Spring Integration that helps with - well - better integrating ArchUnit with Spring applications. By introducing a DSL, ArchUnit Spring Integration allows you to easily enforce constraints regarding common Spring stereotypes such as @RestController. For example, using ArchUnit Spring Integration you can make sure that methods annotated with @GetMapping (or other HTTP verb mappings, for ...

Sunday November 19th, 2023 by Bjoern in Enterprise Software, Software

Björn Wilmsmann

my blog. for you.

Let’s talk digital.