Maartens Notebook

I am moving my notebook to a new location. If you were using a bookmark, please update it to

This site is intended as a list of personal notes, interesting findings or whatsoever. I hope you’ll find it useful. If so, drop me a line, I would love to hear it!

Feel free to get in touch; for options, see below.

Recent notes
  • Building ASP.NET Core apps on CircleCI (Apr 2, 2018)

    Building ASP.NET Core apps on CircleCI

  • Simple UML drawing with PlantUML (Apr 1, 2018)

    Every now and then, there’s this moment where you feel a certain urge to draw a diagram. Oftentimes, I feel a similar urge to make a digital version of it. But I don’t always have professional tooling around - and no, PowerPoint or its friends are not what I’m looking for.

  • Impressions of the first JVMCON (Feb 1, 2018)

    Last Tuesday was the first edition of JVMCON. This conference has a special programme committee: its audience. When the Call for Papers closed, everyone who had a ticket could see the submitted papers. Only, they could not see who submitted the paper - which let them focus on the papers themselves. Out of almost 180 papers, they had to select 13…

  • I upgraded to Java 9 - Part II (Jan 23, 2018)

    A few weeks ago, I wrote about migrating an existing Spring-application to Java 9. When I finished, two things remained to be investigated:

    1. Code coverage for unit tests.
    2. A bunch of warnings when running the application in Tomcat.
  • I upgraded to Java 9 - here's what happened (Jan 12, 2018)

    I recently participated in a Twitter conversation about upgrading to Java 9. Like most of the people, my current projects are all on Java 8. Of course the question came up, why don’t you upgrade? Good question! Since I hadn’t even tried, I decided to see how far I could come…