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.

API Versioning In Spring Framework 7 by Rossen Stoyanchev @ Spring I/O 2025

Sunday August 24th, 2025 by Bjoern in Enterprise Software, Software
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GraphQL, Java, and Spring: The Latest Features by Rossen Stoyanchev @ Spring I/O 2024

Sunday April 27th, 2025 by Bjoern in Enterprise Software, Software
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OpenAPI 3 and Spring Boot 3 – What’s New? by Badr Nass Lahsen @ Spring I/O 2024

Sunday January 26th, 2025 by Bjoern in Enterprise Software, Software
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Making Spring Cloud Gateway Your Perfect API Gateway Solution by Dan Erez @ Spring I/O 2024

Sunday September 29th, 2024 by Bjoern in Enterprise Software, Software
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WireMock Spring Boot

WireMock is an API mocking tool that enables developers to simulate REST APIs during testing. In a system-under-test fashion, it allows us to remove external, potentially flaky, dependencies from our test environment to make our unit tests more focussed and more reliable. WireMock Spring Boot is a new library by consultant and prolific open source contributor Maciej Walkowiak that "drastically simplifies WireMock configuration in a Spring Boot and JUnit 5 application". Featuring a fully declarative WireMock setup and automatic Spring environment setup, ...
Sunday November 5th, 2023 by Bjoern in Enterprise Software, Software
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Problem Spring Web: A Library for Handling Problems in Spring Web MVC

Problem Spring Web is an implementation of the proposed application/problem+json HTTP API problem details response for Spring Web (im both its MVC and WebFlux flavours). Error responses should be a first-class citizen when it comes to providing REST APIs. These responses often are generated in an ad-hoc, non-standardised fashion, which not only makes handling such responses more difficult and tedious in client applications but also makes for less maintainable software in the back-end software providing the API. Problem Spring Web attempts to ...
Sunday October 23rd, 2022 by Bjoern in Enterprise Software, Software, Web Applications
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Documenting REST APIs Provided by Express Applications

swagger-jsdoc is an NPM library that allows us to generate an OpenAPI specification for REST APIs provided by an Express application. swagger-jsdoc consumes YAML-formatted OpenAPI specification segments within JSDoc comments annotated with the @openapi annotation and turns those into a comprehensive OpenAPI specification for our API. This specification, in turn, can for example be used for automatically having a Swagger UI documentation page created for our REST APIs (using Swagger UI Express, for instance). While annotating Express routes with syntactically and semantically correct OpenAPI ...
Sunday March 13th, 2022 by Bjoern in Software, Web Applications
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Automating Processes: Meeting Notes

One of the key benefits of business software, or as a matter of fact, any software, is automation of tedious, repetitive tasks. One of the three great virtues of a programmer according to Perl creator Larry Wall is laziness as defined in: "The quality that makes you go to great effort to reduce overall energy expenditure. It makes you write labor-saving programs that other people will find useful and document what you wrote so you don't have to answer so many ...
Sunday June 13th, 2021 by Bjoern in Business, Software
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CORS: What It Is and How It Works

Expanding on last week's article on best practices for REST API Design I'd like to point to a specific aspect working REST APIs frequently entails: A browser security feature called "Cross-Origin Resource Sharing (CORS)". This feature allows you to define which resources provided by a web application are supposed to be accessible from which origin, which in turn typically is comprised of protocol, host / domain name and port. This website's origin for example is https://bjoernkw.com:80 (port 80 is the default port ...
Sunday May 2nd, 2021 by Bjoern in Front End Development, Software, Web Applications
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