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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.

REST next level: Crafting domain-driven web APIs by Julien Topçu @ Spring I/O 2023

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Ruby on Rails: The Documentary

Ruby on Rails has one of the most faithful communities online, it also has one of the most controversial, rabble-rousing creators out there, Danish programmer, David Heinemeier Hansson. Widely known as DHH, David tells us how Rails went from a crazy idea to one of the most talked-about full-stack frameworks over the course of 20 years. Given that Ruby on Rails has been hugely influential and seminal in the software development industry for the last two decades, not least by inspiring ... Read more

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 ... Read more

Spring Boot & Flyway – How to Clear a Test Database Between Integration Tests

A few months ago, consultant and prolific open source contributor Maciej Walkowiak, of Spring Cloud AWS and just fame, wrote about clearing test databases between integration tests with Spring Boot and Flyway. The recipe / pattern for restoring a test database to its previous state (i.e. the state before a specific integration test has been executed) outlined in that article should come in handy to anyone working with Spring Boot. Moreover, the basic concept is generic enough to be applied to another ... Read more

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, ... Read more

Modern Web App Design Patterns:

After last week's post on The Modern JavaScript Tutorial, a comprehensive guide to modern JavaScript, as something of a follow-up, today I'd like to introduce you to (previously known as "Modern Web App Design Patterns"), an ebook on "design patterns and component patterns for building powerful web apps with vanilla JavaScript and React". The authors of provide design patterns and tips on how to improve the architecture of your web apps. follows a descriptive rather than prescriptive approach in ... Read more

The Modern JavaScript Tutorial

The Modern JavaScript Tutorial is a comprehensive guide to - well - modern JavaScript. Regularly updated and available both for free online (under a CC-BY-NC licence) and as an ebook, this tutorial introduces the reader to JavaScript as it is (or should be) written today. From JavaScript basics to object orientation, data types, functional programming and asynchronous behaviour, it covers everything the prospective JavaScript developer needs to know about writing high-quality, maintainable JavaScript code according to best practices. Read more

Why Spring Belongs In Your Data Stream (From Edge to Multi Cloud) by Fabrizio Marini @ Spring I/O 23

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Build resilient systems with Spring Cloud Contract and Testcontainers by Olga & Oleg @ Spring I/O 23

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The Easy Way to Run and Scale Spring Apps on Cloud by Sean Li & Adib Saikali @ Spring I/O 2023

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