My name is Jan Ouwens and I’m a developer from the Netherlands. Currently, I work for Codestar. I do a bunch of things:
- EqualsVerifier - [site] [github] [java]
A tool to make rigourously testing Java’s equals and hashCode methods a one-liner
- Parallel Java - [github] [java]
A Todo Backend written in Java, without using annotations, to support my talk Java from a Parallel Universe
- PicoTest - [github] [java]
An ultra-minimal unit-testing framework, based on the JUnit 5 Platform
- Foobal - [site] [github] [scala]
A program I use to predict the outcome of soccer matches, so that I can participate in the family pool without needing to learn about the actual sport
- ReminderMail - [site] [github] [kotlin]
A small Android app that makes it easy to quickly send mails to yourself
- ComposeKey - [site] [github] [scala]
A bundle of text-expansion snippets for Alfred that mimic the behaviour of Linux’s compose key
- vim-reversal - [github] [vimscript]
A colorscheme for Vim that highlights identifiers and de-emphasizes keywords, so you can easily see what’s important in your code
- Java from a Parallel Universe - [link]
What Java would look like in a world where annotations were never invented.
Delivered at J-Spring.
- Don’t hack the platform? ☠️💣💥 - [link]
A funny anthology of tricks and hacks for the JVM.
Voted 2018’s “best non-Venkat talk” by the J-Fall audience!
Delivered at J-Fall, JavaZone, JBCNConf and more.
- Not all equals methods are created equal - [link]
How to write a good
equalsmethod, and to test it with EqualsVerifier.
Delivered at Devoxx.
- Growing a DSL for financial calculations - [link]
The story of how my colleague and I ‘discovered’ a Scala DSL for writing complex mortgage calculations.
Delivered at Typelevel Summit Oslo and Codestar Launch Event.
- 2011 - present, tr ouwens - [site] [english]
my tech blog
- My publications in the Dutch Java Magazine
- 2009 - 2012, Brief en leed - [site] [dutch]
a funny letter-writing blog I did with my friend Ralf
- January 2008, Voorstel voor een methode voor de kwantitatieve analyse en vergelijking van beeldverhalen - [PDF] [dutch]
a way too in-depth survey of Asterix jokes
- August 2005, The Performance of Wireless MPEG-2 Video Streaming - [PDF] [english]
my Master’s Thesis