Jörn Dinkla's Blog

Nov 01, 2025 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.

#jvm #architecture #kotlin #object-functional #quality-assurance

Sep 03, 2025 software-engineering

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...

#java #article #jvm #thoughtworks

Mar 31, 2025 software-engineering

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...

#java #concurrency #article #jvm #parallelism

Mar 04, 2020 software-engineering

A short introduction to Kotlin

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

#kotlin #jvm #talk #slides

Apr 23, 2019 software-engineering

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....

#slides #talk #kotlin #concurrency #parallelism #jvm

Jörn Dinkla at the parallel 2019 conference

Feb 21, 2019 software-engineering

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.

#slides #talk #kotlin #concurrency #parallelism #jvm

Jul 22, 2017 software-engineering

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,...

#jvm #functional-programming

Aug 12, 2016 software-engineering

A very good introduction to the best testing framework for the Java platform

In my opinion, the Spock Framework is currently the most convenient testing framework for the Java platform. Since it is built on the Groovy language, it is very expressive.

#tdd #review #jvm

Jul 08, 2015 software-engineering

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...

#groovy #java #model-driven #jvm #graphics

Jul 06, 2015 software-engineering

Covariance and Contravariance in Scala

The topic of covariance and contravariance is explained in many places (including Wikipedia). This post is my attempt to explain it in my own words, using Scala.

#scala #jvm #object-functional

Jul 06, 2015 software-engineering

Covariance and Contravariance in Scala

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

#scala #jvm #object-functional

Jul 02, 2015 big-data

k-d-trees with Apache Spark and Scala

This article shows how to use k-d-trees with Apache Spark.

#data #scala #jvm #object-functional

Jun 17, 2015 software-engineering

A very good introduction to Scala

Scala is an important milestone in the fusion of functional and object-oriented programming. This fusion is not yet complete, but rather a “discovery process” that will continue for a few...

#scala #review #jvm #object-functional

May 28, 2015 software-engineering

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.

#jvm #groovy #spring

May 27, 2015 software-engineering

Using Elasticsearch with Spring Boot - Technical background

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

#jvm #groovy #spring

May 26, 2015 software-engineering

Using Elasticsearch with Spring Boot - Installation and Usage

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

#jvm #groovy #spring

May 25, 2015 software-engineering

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.

#jvm #groovy #spring

Dec 17, 2014 software-engineering

Reviewer of Java 8 in Action

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

#review #java #scala #jvm #object-functional

Nov 11, 2013 software-engineering

Good Overview and Introduction

Anyone wanting to learn Grails cannot ignore “The Definitive Guide to Grails 2”.

#review #web #jvm #groovy

Dec 01, 2011 software-engineering

A Concise Introduction and Overview of Spring ROO

The book “Getting Started with Roo” is just over 50 pages long and provides a brief and high-level introduction to using Spring ROO.

#review #jvm

Dec 01, 2011 software-engineering

Very good in places, unpolished and too brief in others

Programming parallel and concurrent programs with shared memory and threads is complicated and very error-prone. Approaches such as Software Transactional Memory (STM), message-passing architectures, and actor models have been developed...

#parallelism #concurrency #jvm #review #object-functional

Dec 30, 2010 software-engineering

Using Scala and TestNG with Gradle

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

#scala #tdd #jvm #object-functional

Oct 11, 2009 software-engineering

Training: Test-Driven Development with JUnit 4

This training teaches test-driven development with a focus on JUnit 4. Other frameworks such as JUnit 3 and TestNG are briefly introduced as well (as of 2009).

#slides #jvm #tdd

Oct 09, 2009 software-engineering

Training: Ant in Depth

Apache Ant offers a lot of capabilities that many teams never end up using. This training dives into Ant’s more advanced features (as of 2009).

#slides #jvm

Aug 01, 2009 software-engineering

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...

#groovy #eclipse #model-driven #jvm #java

Feb 27, 2008 software-engineering

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...

#groovy #jvm

Feb 01, 2008 games

Dynamic Languages Shootout / OOP 2008

The german magazine JavaSpektrum organized the "Dynamic Languages Shootout" contest for the OOP 2008 conference. The challenge was to create a computer game similiar to Scrabble in a dynamically typed...

#groovy #jvm #parallelism #concurrency

Jan 27, 2008 software-engineering

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).

#ruby #model-driven #jvm

Jan 23, 2008 games

6th place at the Dynamic Languages Shootout at OOP 2008

The challenge was to implement Scrabble® in a dynamically typed programming language. I used Groovy and Grails.

#groovy #games #jvm

Jan 17, 2008 software-engineering

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.

#groovy #eclipse #jvm #java

Dec 01, 2007 software-engineering

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.

#eclipse #jvm #java

Nov 29, 2007 software-engineering

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.

#groovy #eclipse #model-driven #jvm

Nov 01, 2007 software-engineering

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...

#groovy #jvm #parallelism #concurrency

Oct 22, 2007 software-engineering

Using EMF with Groovy

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

#groovy #eclipse #model-driven #jvm

Oct 01, 2007 software-engineering

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.

#groovy #eclipse #model-driven #jvm #data

Apr 02, 2006 software-engineering

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.

#eclipse #jvm #java #model-driven #data

Mar 07, 2006 software-engineering

Eclipse SQL Editor Plugin

I wanted to find out how hard it is to build a language editor in Eclipse. Back then I didn’t know of any open-source SQL editor (and there wasn’t one...

#eclipse #jvm #java

May 10, 2005 software-engineering

Graphical Editors with Eclipse

Over Christmas 2004, I built an EMF plugin for family trees. Around Easter 2005, I finally found the time to develop a GEF-based editor for it.

#eclipse #jvm #java

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