ArnhemJUG | 20 april

Chapter Arnhem '19, Tribe Java
20 april, 17:00 - 21:30
Nog plaatsen over


In the heart of downtown Arnhem, we are hosting the fourth meetup of this year. This time we may welcome Edwin Derks and Tom Cools.


  • 17.00 CET walk-in
  • 17:30 – 18:30 Food and drinks
  • 18.30 – 19.30 talk: Optimize your applications to the max with Jakarta EE and MicroProfile by Edwin Derks
  • 19.30 – 19.45 break
  • 19.45 – 20:45 talk: Modern Testing Patterns by Tom Cools
  • 20.45 – 21.30 drinks

Optimize your applications to the max with Jakarta EE and MicroProfile
When using complementary tools for optimal utilization in containers and scalable infrastructures, you can achieve optimal value when developing and running enterprise software. Jakarta EE’s mechanics and application server runtimes are perfect tools for achieving this goal, especially when complemented with MicroProfile. This applies whether you are building monoliths, microservices, or anything in between.

Attendees will learn how to optimally build, run and deploy such enterprise applications. Therefore, the session will show little application code, but focus on the concepts, tools, and configurations that are applicable. I will also compare some key concepts with competitors like Spring Framework to emphasize the benefits and downsides.

Key takeaways:

  • how to optimally build, run and deploy Jakarta EE and MicroProfile-based enterprise applications
  • how to set up the tooling and stack for applying Jakarta EE and MicroProfile in hyper-modern cloud-native software development with Kubernetes
  • key concepts that emphasize the benefits and downsides of competitors, like Spring Framework

About Edwin Derks
Edwin Derks is a Java Champion and Principal Consultant with Team Rockstars IT. He has a big passion for gathering and sharing knowledge about anything related to the Java ecosystem and cloud-driven development in general. He contributes to MicroProfile and Jakarta EE, writes articles and often speaks at conferences. In his spare time, he can often be found in the gym or having a good time at dance parties or metal concerts.

Modern Testing Patterns
Unit Tests by themselves give no guarantee that your system will work in a production environment. That’s where your code will have to work together with other resources like databases and APIs. Unfortunately, those are the kind of dependencies we try to avoid in tests by using mocking-frameworks. Risky business, because this means we’ll only know if the application really works when you push it to production.

In this session we’ll look at some strategies you can use to test your application without mocking your dependencies away. You’ll discover how tools like Liquibase, TestContainers, WireMock and Spring Cloud Contract can immensely improve your tests so you can deploy your application to production AND sleep at night.

About Tom Cools
Developer without borders, both geographically and technically. Active as a consultant with a focus on Java technologies.

Next to that I am a trainer and mentor who loves to share not only knowledge but also passion for our craft. I do this through mentorships (, guiding students at my alma mater or just helping strangers on Twitter and StackOverflow.

Married, our first kid on their way, 2 cats and happy owner of a whole lot of nerdy/techy stuff.

Currently working for Info Support nv. in Mechelen, Belgium.



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