Posts in Software Engineering

Announcing NKP 0.1: Static Analysis for Kotlin Projects

I’m excited to share the first MVP release of NKP (aNalysis of Kotlin Programs), a command-line tool for analyzing Kotlin codebases and uncovering architectural insights.

software-engineering en jvm architecture kotlin object-functional quality-assurance

Nov 01, 2025 Read more arrow_forward

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Java in the Technology Radar (JavaSpektrum)

I’ve written a new article for JavaSpektrum: “Java im Technology Radar – Totgesagte leben länger”. The piece looks back at Java’s journey through the eyes of the Thoughtworks Technology Radar...

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Sep 03, 2025 Read more arrow_forward

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Structured Concurrency in Java 24 (JavaSpektrum)

I’ve written an article for JavaSpektrum 2/2025 about Structured Concurrency in Java 24. The article covers JEP 499, Java’s fourth preview of Structured Concurrency, which aims to make concurrent programming...

software-engineering en java concurrency article jvm parallelism architecture

Mar 31, 2025 Read more arrow_forward

Who Ensures Quality in the Scaled Agile Framework (SAFe)?

As an external consultant in an Enabling Team for Cloud Architecture, I supported several teams and noticed that software development quality was lacking. This surprised me because the client was...

software-engineering en agile quality-assurance

May 31, 2024 Read more arrow_forward

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Test driven development of concurrent programs in Kotlin at KKon 2022

Concurrent and asynchronous applications can be written in Kotlin with coroutines in a precise and structured way. Unfortunately, concurrency often increases the complexity and it is difficult to create bug-free...

software-engineering en kotlin parallelism concurrency talk slides quality-assurance

Sep 13, 2022 Read more arrow_forward

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Coroutines in Kotlin at KKon 2021 Warmup

In my talk “Nebenläufigkeit mit Koroutinen strukturieren” at the KKon 2021 Warmup I explained how to structure and organize concurrent programs with coroutines in Kotlin.

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Apr 23, 2021 Read more arrow_forward

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The Ray Tracer Challenge in Kotlin

During the chrismas holiday I started a new ray tracer in Kotlin while following the book “The Ray Tracer Challenge.

software-engineering en kotlin graphics

Jan 10, 2021 Read more arrow_forward

Update of my website to Bootstrap 5

I updated my website so that it looks new and shiny and provides faster and easier access.

software-engineering en web

Dec 29, 2020 Read more arrow_forward

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Refactoring with the Mikado Method

At a client of ThoughtWorks I gave a talk about refactoring in line with the book “Mikado Method”. The book describes a method to plan and perform non-trivial refactorings of...

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Apr 02, 2020 Read more arrow_forward

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A short introduction to Kotlin

At a client of ThoughtWorks I gave a talk about the advantages of Kotlin.

software-engineering en kotlin jvm talk slides

Mar 04, 2020 Read more arrow_forward

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Plain react, hooks and/or Redux

At a client of ThoughtWorks I gave a short presentation about three different ways of state management in React.

software-engineering en talk slides javascript front-end

Mar 04, 2020 Read more arrow_forward

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Coroutines in Kotlin and Go in iX Developer - "Weniger warten, asynchron arbeiten"

In the article “Verteilte Systeme: weniger warten, asynchron arbeiten” (distributed systems: less waiting, asychronous working) in the german magazine iX Developer Moderne Softwareentwicklung - code(), build(), deploy() I explain the...

software-engineering en article kotlin concurrency parallelism golang

Dec 01, 2019 Read more arrow_forward

Migrating a ray tracer from Java and Groovy to Kotlin (part 3)

I continued to work on migrating my ray tracer to Kotlin. Now the scenes can be specified with a Kotlin DSL and all Groovy code is gone.

software-engineering en kotlin graphics

May 25, 2019 Read more arrow_forward

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Coroutines in Kotlin and Go on heise Developer

In the article “Weniger warten, asynchron arbeiten” (less waiting, asychronous working) published by heise Developer I explain the theoretical background of coroutines and how to use them in Kotlin and...

software-engineering en article kotlin concurrency parallelism golang

May 06, 2019 Read more arrow_forward

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Concurrency in Kotlin with coroutines

Coroutines are a “new” way to handle concurrency on the JVM. I gave an introduction to coroutines in Kotlin at Thoughtworks. This is basically the translation of the german slides....

software-engineering en slides talk kotlin concurrency parallelism jvm

Apr 23, 2019 Read more arrow_forward

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Talk about coroutines in Kotlin at the parallel 2019 conference

Coroutines are a “new” way to handle concurrency on the JVM. At the para//el 2019 conference, I gave an introduction to coroutines in Kotlin.

software-engineering en slides talk kotlin concurrency parallelism jvm

Feb 21, 2019 Read more arrow_forward

Fusion of object oriented and functional programming

The fusion of Object Oriented Programming (OOP) and Functional Programming (FP) languages has become increasingly popular in recent years, with many programming languages now offering features and constructs from both...

software-engineering en kotlin object-functional scala functional-programming

Jan 02, 2019 Read more arrow_forward

Migrating a ray tracer from Java and Groovy to Kotlin (part 2)

I continued to work on migrating my ray tracer to Kotlin.

software-engineering en kotlin graphics

Oct 06, 2018 Read more arrow_forward

Migrating a ray tracer from Java and Groovy to Kotlin (part 1)

After reading the wonderful book Kotlin in Action I started to migrate my ray tracer from Java and Groovy to Kotlin.

software-engineering en kotlin graphics

Feb 25, 2018 Read more arrow_forward

EuroClojure 2017 in Berlin

In my first project for ThoughtWorks the backend is written in Clojure. Since the project was in Berlin, I visited the EuroClojure 2017 which takes place in Berlin this year,...

software-engineering en jvm functional-programming

Jul 22, 2017 Read more arrow_forward

Working for ThoughtWorks

After long considerations i decided to quit being a freelancer and joined ThoughtWorks in Hamburg, Germany.

software-engineering en thoughtworks

Feb 01, 2017 Read more arrow_forward

Updated library of geometric algorithms

Today I released an updated version of the library of geometric algorithms.

software-engineering algorithms en functional-programming

Nov 22, 2016 Read more arrow_forward

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Visualisierung von Familiennamen mit Node, Angular und D3 für Coding da Vinci Nord 2016

Im Rahmen des Kultur-Hackathons Coding da Vinci Nord 2016 habe ich eine Web-Applikation für die Analyse und Visualisierung der Verbreitung von Familiennamen erstellt. Hierzu habe ich u. a. Node.js, Express,...

software-engineering javascript web de java data front-end

Nov 10, 2016 Read more arrow_forward

Sehr guter Einstieg in das beste Test-Framework für die Java-Plattform

Das Spock-Framework ist momentan meiner Meinung nach das komfortabelste Test-Framework für die Java-Plattform. Da es auf der Sprache Groovy aufbaut ist es sehr ausdruckstark.

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Aug 12, 2016 Read more arrow_forward

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Reviewer of Introducing Data Science

I bought the book in early access (MEAP) and decided to help as a reviewer.

software-engineering review en

May 31, 2016 Read more arrow_forward

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Ray tracing with Groovy and Java

While I was reading the excellent book by Kevin Suffern "Ray tracing from the ground up", I implemented a ray tracer in Java and wrote a DSL in Groovy, to...

software-engineering groovy java model-driven jvm graphics en

Jul 08, 2015 Read more arrow_forward

Kovarianz und Kontravarianz in Scala

Das Thema "Kovarianz und Kontravarianz" wird zwar auch bei Wikipedia erklärt, ich versuche es hier mit eigenen Worten und Scala.

software-engineering scala jvm de object-functional

Jul 06, 2015 Read more arrow_forward

Covariance and Contravariance in Scala

I explain "covariance and contravariance" with some simple Scala examples.

software-engineering scala jvm en object-functional

Jul 06, 2015 Read more arrow_forward

Sehr gute Einführung in Scala

Scala ist ein wichtiger Meilenstein bei der Fusion von funktionaler und objektorientierter Programmierung. Diese Fusion ist noch nicht abgeschlossen, sondern ein “Entdeckungs-Prozess”, der noch ein paar Jahre andauern wird.

software-engineering scala de review jvm object-functional

Jun 17, 2015 Read more arrow_forward

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Using Elasticsearch with Spring Boot - Analyzing the emails with Kibana

This is the last part in a series of four. It shows how to analyse the emails with Kibana.

software-engineering jvm groovy spring

May 28, 2015 Read more arrow_forward

Using Elasticsearch with Spring Boot - Technical background

This is the third part in a series of four. It explains the technical background.

software-engineering jvm groovy spring

May 27, 2015 Read more arrow_forward

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Using Elasticsearch with Spring Boot - Installation and Usage

This is the second part in a series of four. It shows installation and usage.

software-engineering jvm groovy spring

May 26, 2015 Read more arrow_forward

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Using Elasticsearch with Spring Boot

This article shows how to use Elastiksearch database with Spring Boot. It is the first in a series of four.

software-engineering jvm groovy spring

May 25, 2015 Read more arrow_forward

Measuring traffic on the PCI Express Bus (PCIe)

During my talk at the parallel 2015 conference i was asked how one can measure traffic on the PCI express bus. For multi GPU computing it is very important to...

software-engineering c++ en

Apr 24, 2015 Read more arrow_forward

OO mit JavaScript hervorragend erklärt

JavaScript hat einen Prototyp-basierten Ansatz zur Objektorientierung. Damit unterscheidet es sich stark von den üblichen objektorientierten Programmiersprachen, wie z. B. Java, C++ und Ruby.

software-engineering javascript de review

Apr 04, 2015 Read more arrow_forward

Trying out next-gen JavaScript now with ECMAScript 6

With Babel you can test many features of the upcoming next version of JavaScript called ECMAScript 6 now.

software-engineering javascript en

Apr 04, 2015 Read more arrow_forward

Examples for parallelism: ray tracer

I wanted to learn some frameworks for parallel computing and i decided to implement a simple ray tracer as a "visual benchmark".

software-engineering c++ java graphics en parallelism concurrency

Mar 03, 2015 Read more arrow_forward

Fortgeschrittenes ‘git'

Ich benutze git zwar schon ein paar Jahre, wollte aber mehr Hintergrundwissen haben und komplexere Abläufe kennenlernen. Das ist dem Buch “Git in Practice” zum einen gelungen, trotzdem habe ich...

software-engineering review de

Jan 29, 2015 Read more arrow_forward

Zu kurzer Einstieg in PaaS

“Understanding PaaS” ist ein sehr kleines Büchlein über die Grundlagen des Cloud Computings. Es kann gelesen werden, um sehr schnell in die Thematik einzusteigen. Es ist eher für Entwickler geschrieben,...

software-engineering review de

Jan 27, 2015 Read more arrow_forward

Fast definitiver Einstieg in MongoDB

“MongoDB: The Definitive Guide” ist ein gelungener Überblick auf MongoDB sowohl aus Entwickler- als auch als DBA-Perspektive. Jedenfalls soweit ich das als MongoDB-Einsteiger mit mehr als 11 Jahren Data-Warehousing-Projekterfahrung sagen...

software-engineering review de data javascript

Jan 16, 2015 Read more arrow_forward

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Reviewer of Java 8 in Action

I bought the book in early access (MEAP) and decided to help as a reviewer.

software-engineering review de java scala jvm object-functional

Dec 17, 2014 Read more arrow_forward

“Anspruchsvolles” JavaScript

Wenn es “anspruchsvolle” Literatur gibt, dann gibt es jetzt auch “anspruchsvollen” Code. “If Hemingway Wrote JavaScript” enthält viele lustige und lehrreiche Beispiele.

software-engineering javascript review de

Dec 17, 2014 Read more arrow_forward

Neuauflage erforderlich: Gutes Buch, aber leider nicht mehr aktuell

“Using OpenMP” ist eine gute Einführung und enthält ein paar gute Performancetipps.

software-engineering c++ parallelism concurrency review de

Mar 20, 2014 Read more arrow_forward

Zur Zeit beste Darstellung von Patterns für Shared-Mutability

Wenn man ein wenig Systematik in seine parallelen Programmierkünste bringen will, ist “Structured Parallel Programming: Patterns for Efficient Computation” das Buch zum Einsteigen.

software-engineering parallelism concurrency c++ review de opencl nvidia-cuda gpu-computing

Mar 11, 2014 Read more arrow_forward

Empfehlenswerter Klassiker in Neuauflage

Ich hatte damals 1992 schon die zweite Auflage gelesen. Seit dem hat sich sehr viel zum Positiven geändert, sowohl bei C++ als auch bei diesem „Klassiker“.

software-engineering c++ review de

Feb 25, 2014 Read more arrow_forward

Guter Überblick über C++ 11

In diesem kleinen Buch gibt der Erfinder von C++ einen Überblick auf die Neuigkeiten von C++ 11 und der STL.

software-engineering c++ review de

Feb 11, 2014 Read more arrow_forward

Gute Übersicht und Einführung

An “The Definitive Guide to Grails 2” kommt keiner vorbei, der Grails lernen will.

software-engineering review de web jvm groovy

Nov 11, 2013 Read more arrow_forward

Sehr viel Haskell, zu wenig funktionale Programmierung

Ich habe “Learn You a Haskell for Great Good” zur Auffrischung meiner Haskell-Kenntnisse gelesen. Während meines Studiums in den neunziger Jahren war ich begeisterter funktionaler Programmierer. Meine Diplomarbeit habe ich...

software-engineering functional-programming review de

Oct 15, 2013 Read more arrow_forward

Tipps mit sehr unterschiedlicher Qualität

Das Buch “97 Things Every Programmer Should Know” besteht aus 97 Abschnitten von unterschiedlichen Autoren zu oft auftretenden Fragen bei der Softwareerstellung.

software-engineering review de

Jul 30, 2013 Read more arrow_forward

Erste Schritte im API Design mit C++

“API Design for C++” ist eine hervorragende Einführung in die Implementierung von APIs mit C++.

software-engineering review de c++

Jul 07, 2012 Read more arrow_forward

Empfehlenswert als Nachschlagewerk

“Patterns for Parallel Programming” ist ein wichtiges Werk für ‘parallele Programmierer’.

software-engineering review de parallelism concurrency

Feb 23, 2012 Read more arrow_forward

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Slides: 'Introduction to Parallel Computing'

These slides are for a course about parallel computing.

software-engineering slides en parallelism concurrency

Dec 12, 2011 Read more arrow_forward

Gute Einführung in jQuery und das Drumherum

“Head First jQuery” ist im “Heads First”-Stil gehalten und richtet sich an Anfänger und Quereinsteiger, die bereits über Grundkenntnisse in HTML und CSS und Programmierkenntnisse verfügen.

software-engineering review de web

Dec 06, 2011 Read more arrow_forward

Knapper Einstieg und Überblick auf Spring ROO

Das Buch “Getting Started with Roo” hat nur etwas über 50 Seiten und beinhaltet eine kurze und oberflächige Einführung in die Benutzung von Spring ROO.

software-engineering review de jvm

Dec 01, 2011 Read more arrow_forward

Stellenweise sehr gut, stellenweise nicht ausgereift und zu knapp

Die Programmierung von parallelen und nebenläufigen Programmen mit Shared-Memory und Threads ist kompliziert und sehr fehleranfällig. Als Lösungsansätze wurden z. B. Software-Transactional-Memory (STM), Message-Passing-Architekturen und Aktoren-Modelle entwickelt. In “Programming Concurrency...

software-engineering parallelism concurrency jvm review de object-functional

Dec 01, 2011 Read more arrow_forward

Nur für 'Thread-Monkeys'

Mit dem Titel “The Art of Concurrency” wird ein hoher Anspruch geweckt, der nicht erfüllt wird. Der Untertitel “A Thread Monkey’s Guide to Writing Parallel Applications” wird dem Inhalt schon...

software-engineering review de parallelism concurrency c++

Nov 15, 2011 Read more arrow_forward

Dieses Buch wird Ihnen helfen, ein besserer Programmierer zu werden

“Dieses Buch wird Ihnen helfen, ein besserer Programmierer zu werden” steht als erster Satz in der Einleitung des Buchs “Der Pragmatische Programmierer”. Und ich bin der Meinung, dass es stimmt....

software-engineering review de agile

Nov 04, 2011 Read more arrow_forward

Hervorragendes Buch für Einsteiger und Fortgeschrittene

“Ray Tracing from the Ground Up” ist ein hervorragendes Buch für Einsteiger und Fortgeschrittene. Man merkt, dass sich der Autor viele Jahre mit dem Thema beschäftigt hat und dass er...

software-engineering review de graphics c++

Jan 10, 2011 Read more arrow_forward

Using Scala and TestNG with Gradle

During the christmas holidays i tried out Scala and TestNG with Gradle.

software-engineering scala tdd jvm object-functional

Dec 30, 2010 Read more arrow_forward

Sony Alienates Early PlayStation 3 Fans

On April 1st, Sony released an update for the PlayStation 3 that discontinued support for Linux. This move angered many, sparking intense reactions and discussions.

software-engineering parallelism concurrency en

Apr 07, 2010 Read more arrow_forward

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Schulung: 'Testgetriebene Entwicklung mit JUnit 4'

Diese Schulung vermittelt die testgetriebene Entwicklung mit dem Schwerpunkt auf JUnit 4. Andere Frameworks wie JUnit 3 und TestNG werden kurz eingeführt (Stand 2009).

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Oct 11, 2009 Read more arrow_forward

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Schulung 'Subversion'

In der Schulung über Subversion geht es um die Versionsverwaltung.

software-engineering slides de

Oct 10, 2009 Read more arrow_forward

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Schulung 'Ant im Detail'

Ant bietet immens viele Möglichkeiten, die den meisten nicht bekannt sind. Diese Schulung geht in die Tiefen von Ant (Stand 2009).

software-engineering slides de jvm

Oct 09, 2009 Read more arrow_forward

Groovy, EMF and UML2

I wrote the Groovy EMF builder and the Groovy UML2 builder. These tools use the builder concept of the programming language Groovy to ease the processing of Eclipse Modelling Framework...

software-engineering groovy eclipse model-driven en jvm java

Aug 01, 2009 Read more arrow_forward

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Hyper-Threading with the Intel Core i7

I have got a new computer. As alway i build it myself. How much faster is it?

software-engineering parallelism concurrency c++ en

Jun 14, 2009 Read more arrow_forward

Parallelization with Haskell - Easy as can be

The functional programming language Haskell provides a very easy way of parallelization.

software-engineering parallelism concurrency en functional-programming

Jun 07, 2009 Read more arrow_forward

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Real-Time RayTracer running on Intel Core i7

I tested my ray tracer on Intel Core i7 920 @2.67 MHz.

software-engineering parallelism concurrency graphics c++ en

Jun 04, 2009 Read more arrow_forward

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Real-Time RayTracer running on Core 2 Duo

I tested my ray tracer on my Mac Book Pro.

software-engineering parallelism concurrency graphics c++ en

May 24, 2009 Read more arrow_forward

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Parallelization with the Cell Broadband Engine

I wanted to learn about the cell broadband engine in the Playstation 3 and wrote a parallel ray tracer for it.

software-engineering parallelism concurrency graphics c++ en

May 19, 2009 Read more arrow_forward

New version of the library of geometric algorithms in Haskell

Almost 10 years after the initial release, i released an updated version of the library of geometric algorithms in Haskell. It now builds with Cabal and requires the Glasgow Haskell...

software-engineering functional-programming algorithms en

Feb 27, 2008 Read more arrow_forward

Memoization in Groovy with a Decorator

Memoization is a well known optimization technique to avoid repeated calculations. With dynamic programming languages like Groovy it is possible to extend the behaviour of an already exisiting class at...

software-engineering groovy jvm

Feb 27, 2008 Read more arrow_forward

Accessing EMF models with JRuby

JRuby provides access to Java packages, so it is possible to use packages created with the Eclipse Modeling Framework (EMF).

software-engineering ruby model-driven en jvm

Jan 27, 2008 Read more arrow_forward

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Writing Eclipse plugins with Groovy

Writing plugins for Eclipse with other languages than Java is not officially supported, but there is a way to write an Eclipse plugin with Groovy only.

software-engineering groovy eclipse en jvm java

Jan 17, 2008 Read more arrow_forward

Eclipse BugDays 2007

I participated at Eclipse BugDays in July, August, September, October, and November 2007 and helped debugging the Eclipse projects JDT, PDE/UI, and ECF.

software-engineering eclipse en jvm java

Dec 01, 2007 Read more arrow_forward

Using UML2 with Groovy

The UML2 project provides an EMF based implementation of the UML 2.x metamodel in Java. With the EMFBuilder it is possible to create and process UML2 models.

software-engineering groovy eclipse model-driven en jvm

Nov 29, 2007 Read more arrow_forward

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Rapid Application Development with Groovy

While i was cleaning up my hard disk on my Linux in 2007, i needed a program that displays the disk usage graphically. I didn't find a suitable one on...

software-engineering groovy jvm parallelism concurrency en

Nov 01, 2007 Read more arrow_forward

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Using EMF with Groovy

This article shows how Groovy can be used with the Eclipse Modeling Framework (EMF).

software-engineering groovy eclipse model-driven en jvm

Oct 22, 2007 Read more arrow_forward

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Editor for the Common Warehouse Metamodel (CWM)

The Common Warehouse Metamodel (CWM) is a standard by the Object Management Group (OMG). The intention of CWM is to define a standard for metadata in Data Warehouses and Business Intelligence applications.

software-engineering groovy eclipse model-driven en jvm data

Oct 01, 2007 Read more arrow_forward

Higher order Markov chains in Ruby - Ruby Quiz #74

Here’s my second solution for the quiz No 74. It generates text with a first or higher order Markov chains. See also the first order version.

software-engineering ruby en algorithms

Apr 11, 2006 Read more arrow_forward

Markov chains in Ruby - Ruby Quiz #74

Here’s my solution for the quiz No 74. It generates text with a first order Markov chain.

software-engineering ruby en algorithms

Apr 09, 2006 Read more arrow_forward

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Eclipse-Editor for data warehousing metadata with EMF

When i first heard of the Eclipse Modeling Framework (EMF) i got really excited, i tried it out and i wanted to use it.

software-engineering en eclipse jvm java model-driven data

Apr 02, 2006 Read more arrow_forward

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Eclipse SQL Editor Plugin

Ich wollte herausfinden, wie schwer es ist, in Eclipse einen Editor für eine Programmiersprache zu schreiben. Ich kannte damals keinen Open-Source-SQL Editor (auch für Eclipse gab es noch keinen) und...

software-engineering de eclipse jvm java

Mar 07, 2006 Read more arrow_forward

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Graphical Editors with Eclipse

Über Weihnachten 2004 schrieb ich ein EMF-Plugin für Familenstammbäume. Ostern 2005 fand ich dann die Zeit dafür, einen GEF-Editor dafür zu entwickeln.

software-engineering de eclipse jvm java

May 10, 2005 Read more arrow_forward

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Geometric algorithms in Haskell

In my diploma thesis I investigate functional programming and geometric algorithms

software-engineering algorithms en functional-programming

Oct 19, 1998 Read more arrow_forward

Dynamisches Scheduling in Realzeitsystemen

In dieser Seminararbeit für mein Hauptstudium habe ich 1996 Algorithmen für das Scheduling in verteilten Realzeitsystemen im Rahmen meines Informatikstudiums behandelt.

software-engineering parallelism concurrency algorithms de distributed

May 07, 1996 Read more arrow_forward

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Optimale schnelle List-Ranking- und Präfix-Algorithmen

In dieser Seminararbeit werden optimale Algorithmen für Präfixsummen behandelt.

software-engineering parallelism concurrency algorithms de

Feb 05, 1995 Read more arrow_forward

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Graphics programming in c't

Programming TrueColor graphics with the Diamond Speedstar 24x

software-engineering en graphics article

Mar 31, 1993 Read more arrow_forward