Posts tagged "Java"

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… And guess what: one of them was mine! I presented my talk for the early birds, and there were quite a lot of them! — Read more... →

A few weeks ago, I wrote about migrating an existing Spring-application to Java 9. When I finished, two things remained to be investigated: Code coverage for unit tests. A bunch of warnings when running the application in Tomcat. Code coverage for unit tests As Alan Bateman pointed out, upgrading JaCoCo to its latest version should resolve the issue about the $jacocoData field. In fact, I thought I had done that, but somehow I kept on getting the same error every single time. — Read more... →

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… The component I took for my experiment is a pretty simple Spring application. It doesn’t use Spring Boot. It exposes a few REST endpoints, and calls couple of webservices over SOAP. — Read more... →

Almost two months ago I visited Devoxx 2017. It’s about time to write some notes on the stuff I learnt there! Event Storming & DDD workshop The week started off with a full afternoon workshop led by Stijn Vanpoucke. The workshop consisted of small pieces of theory, alternated with exercises using post-it’s and markers. A few of the theoretic pieces: An event is something that has happened in the past. It is usually phrased in past tense. — Read more... →

It’s been a while since my last post! I recently have been reading a lot about the idea of “API management” or an “API gateway”. There’s a lot of commercial offerings in this field. Many of them promise you (to some extend) ultimate flexibility and endless possibilities. My preference is for “lean and mean” approaches where I can pick the building blocks that I need. In the long run, that offers more flexibility. — Read more... →

This year, I had the pleasure again to visit JavaOne. Not only did I attend the conference, I was also accepted to speak, which was quite a dream come true. The session catalog contains almost 500 sessions, and I obviously visited only a subset of them. I found two topics particularly interesting and decided to attend multiple sessions on each of them. “Prepare for JDK 9” and “Migrating to Java 9 Modules” Both sessions where more or less covering the same ground, although from a different perspective. — Read more... →

Wow, that was a busy and inspiring week! In one week, I’ve visited two conferences in two different countries to give talks on two different subjects. But the most inspiring part came from attending other sessions. I’ll highlight one session from both conferences. JBCNConf 2017 On JBCNConf, I’ve attented a session by Burr Sutter about Vert.x. This was a session full of energy, as Burr is really capable of making your enthusiastic of whatever he is talking on. — Read more... →

Sometimes you have a piece of logging that is very important, maybe even part of a business requirement. In that case, you might want to verify that in a unit test, so you can rest assured that this requirement is actually met. How to do that? Mock it away A first approach might be to just mock your logging framework in a unit test and verify it was called as you expected. — Read more... →

As a closing keynote on the second day of Jfokus, Jonas Bonér took the stage under the very clarifying title “Blah blah Microservices blah blah”, which turned out to mean “From microliths to microsystems”. As a first observation, he stated that no-one really likes microservices. They are kind of a necessary evil - because “doing” microservices comes at a cost. In fact, microservices are just a specialisation of an older concept called distributed systems. — Read more... →

The second day of Jfokus is just as action-packed as the first one. However, part of the action is me giving two talks. Both of them scheduled today, so a little less time for attending other sessions and blogging about them. I did attend some other sessions after lunch time, on which I’ll report below. Introduction to Machine Learning Directly after the lunch, James Ward gave an introduction to machine learning. — Read more... →