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Jaap Coomans

@jaapcoomans.nl
138 followers 176 following 47 posts

Father | Husband | Developer | Java | Kotlin | @brabantjug.nl leader | Speaker | Craft beer sampler | Board game player | Willem II 🔴⚪🔵| He/him

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Reposted by Jaap Coomans
Brabant JUG @brabantjug.nl · 24/08/2026
Did you have a good holiday? We did, and we've been busy with arranging a fresh meetup for you with our friends at TOPDesk in Tilburg on 29 september! We're also preparing the next meetup, so keep an eye on our socials! www.meetup.com/brabant-jug/...
meetup.com
BrabantJUG @ TOPDesk, Tue, Sep 29, 2026, 5:00 PM | Meetup
## Details On 29 September, BrabantJUG will be hosting a meetup at TOPdesk! We have 2 great speakers lined up for you. **Geertjan Wielenga** will speak about **From CRUD t
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Jaap Coomans @jaapcoomans.nl · 11/06/2026
Two speakers, two stories, one message: take care of your model. Keep it alive and allow it to evolve. Two great complementay talks by Nico Krijnen and Omphile Matheolane. #dddeu
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Felienne Hermans @felienne.bsky.social · 11/06/2026
tl;dr We are focusing on the wrong things, on prestige and puzzles and not on building software for humanity. So even if LLMs are going to make building software quicker and less errorprone (I don't believe that, but let's for a sec) that is still net negative if are are building bad things
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Jaap Coomans @jaapcoomans.nl · 11/06/2026
"Conway's law is the closest thing software has to gravity" @indu-alagarsamy.bsky.social #dddeu
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Jaap Coomans @jaapcoomans.nl · 10/06/2026
@felienne.bsky.social closing keynote at @dddeu.bsky.social blew me away. First time ever I witnessed a minutes long standing ovation after a talk at a tech conference. She painfully exposed what is wrong in the software industry through her personal story. #dddeu
Felienne Hermans on stage at DDD Europe
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Jaap Coomans @jaapcoomans.nl · 10/06/2026
Finally managed to visit DDD Europe. Great conference so far. Just 4 sessions in, already packed with a lot of new insights. #dddeu
Eric Evans on stage during the opening keynote of DDD EuropeAntwerpen Centraal and a ferris wheel as seen from the entrance of the Elisabeth hallRaj Navakoti speaking about reverse engineering DDD.
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Brabant JUG @brabantjug.nl · 04/06/2026
Are you ready for @nljug.bsky.social #jspring? Come join us for a chat at the JUG corner!
A picture showing the BrabantJUG banner with our logo and qr codes for our socials.
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Brabant JUG @brabantjug.nl · 01/04/2026
On our way to @amsterdam.voxxeddays.com. You can find us in the JUG Square. See you at the hallway track 😉
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Sharat (Shar) Chander - 🟦🌊 @sharatchander.bsky.social · 31/03/2026
Well, my #Java journey has come to an end. Today my role at Oracle has been terminated. I’m open to any job leads y’all may have.
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Peter Hicks @poggs.com · 26/02/2026
Once again, going to @devoxx.uk has helped me work better. I needed some test data for an application for a customer, and remembered @jaapcoomans.nl's talk on DataFaker www.youtube.com/watch?v=-lKz... Result? A delighted customer and a happy developer :)
youtube.com
Fairies, Fakers and Factories: boost you tests with better test data by Jaap Coomans
YouTube video by Devoxx UK
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Nicolai Parlog @nipafx.dev · 26/11/2025
JUnit is undoubtedly one of the most important projects in the #Java ecosystem. And it's 100% free and open! Let me be frank: If we can't get THIS project to the point where a single maintainer can focus on it, then what does that say about our commitment to Free & Open Source Software? 1/3 ⏩
steady.page
Support JUnit
JUnit is maintained by a team of passionate volunteers. This is your chance to give back and support the project!
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Brabant JUG @brabantjug.nl · 21/11/2025
Today we experienced the power of the #Java #Community Within 2 hours after one of our speakers had to cancel we found a great new speaker for this meetup. And even more were willing to step up. A big shout-out to the community!
media.tenor.com
a close up of a minion with the words face it you rock below it
ALT: a close up of a minion with the words face it you rock below it
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Brabant JUG @brabantjug.nl · 20/11/2025
Just 4 days until our next Meetup! This time Sioux will be hosting us in their Eindhoven office. 🗣️ @marianne-h.bsky.social - Unveiling the simple math that powers AI 🗣️ @josroseboom.bsky.social - When ORM becomes OMG: Performance Pitfalls in JPA and Friends www.meetup.com/brabant-jug/...
meetup.com
BrabantJUG @ Sioux Technologies, Mon, Nov 24, 2025, 5:30 PM | Meetup
On 24 November, BrabantJUG will be hosting our next meetup, this time at a new host: Sioux Technologies. Again we will have some great content for you. See you there! **Ti
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Andres Almiray @andresalmiray.com · 11/11/2025
Hi everyone! An ongoing reorganization at my current employer has prompted me to seek for a new role and would appreciate your support. I'm open to remote (anywhere) and hybrid roles in Switzerland. I have 25+ years experience as a software developer, 8 as devrel www.linkedin.com/posts/aalmir...
linkedin.com
#opensource #opentowork | Andres Almiray
Hi everyone! An ongoing reorganization at my current employer has prompted me to seek for a new role and would appreciate your support. I'm open to remote (anywhere) and hybrid roles in Switzerland (...
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Brabant JUG @brabantjug.nl · 06/11/2025
We're present at the community hub at @nljug.bsky.social #JFall today together with a lot of other friendly local JUGs. Come have a chat
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Jaap Coomans @jaapcoomans.nl · 06/11/2025
Ready for #JFall to start!
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Jaap Coomans @jaapcoomans.nl · 06/11/2025
Starting the day with a crime scene investigation... Who killed Duke? #JFall
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Jaap Coomans @jaapcoomans.nl · 09/10/2025
Primary reason for visiting #Devoxx whenever I can: Ask The Architects. Rarely enter with a specific question. Always walk out with tons of new insights. #askarch
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Jaap Coomans @jaapcoomans.nl · 09/10/2025
You know @devoxx.com has started when you're having Koffiekoeken in the morning. #Devoxx
A table filled with trays of all different kinds of Belgian Koffiekoeken.
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Ko Turk @handle.invalid · 08/10/2025
The Call for Papers for Voxxed Days Amsterdam 2026 is officially OPEN! 😎 Do you have the the knowledge, experience or have an idea to share to the #Java community? This is your chance! 📅 Date: April 1–2, 2026 📌 Submit your proposal: vdams26.cfp.dev
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NLJUG - Dutch Java User Group @nljug.bsky.social · 24/09/2025
𝐓𝐡𝐞 𝐯𝐞𝐫𝐲 𝐟𝐢𝐫𝐬𝐭 𝐛𝐚𝐭𝐜𝐡 𝐨𝐟 𝐉-𝐅𝐚𝐥𝐥 2025 𝐭𝐢𝐜𝐤𝐞𝐭𝐬 𝐠𝐨𝐞𝐬 𝐥𝐢𝐯𝐞 𝐭𝐨𝐦𝐨𝐫𝐫𝐨𝐰, 𝐒𝐞𝐩𝐭𝐞𝐦𝐛𝐞𝐫 25𝐭𝐡 𝐚𝐭 12:00 Better set your alarms, because these early tickets are always gone in a flash. Claim your ticket www.eventbrite.nl/e/j-fall-202... #NLJUG #Java #Jfall #Tickets
eventbrite.nl
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Brabant JUG @brabantjug.nl · 16/09/2025
After some drinks and good conversation we continue the evening with @davidvlijmincx.com speaking about Async IO with Java and C.
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Brabant JUG @brabantjug.nl · 16/09/2025
First up tonight is @balarawool.bsky.social, telling us about the secrets of Vector Databases.
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Brabant JUG @brabantjug.nl · 16/09/2025
@remcoder.bsky.social and Joep Weijers kicking of the gezelligste JUG of the Netherlands at TOPdesk!
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Jaap Coomans @jaapcoomans.nl · 29/08/2025
Come for the content, stay for the Brabantse gezelligheid!
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Brabant JUG @brabantjug.nl · 29/08/2025
Now the summer holiday is over, it's time for a great new BrabantJUG Meetup! On 16 September TOPdesk will be hosting us in #Tilburg. We have 2 great speakers: @balarawool.bsky.social: Making Sense of Vector Databases @davidvlijmincx.com: Async IO with Java and C www.meetup.com/brabant-jug/...
meetup.com
BrabantJUG @ TOPDesk, Tue, Sep 16, 2025, 5:00 PM | Meetup
## Details On 16 September, BrabantJUG will be hosting our next meetup at TOPdesk! We have 2 great speakers lined up for you. **David Vlijmincx** will speak about **Async
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Daniel Kocot @danielkocot.bsky.social · 02/04/2025
JavaLand 2025 was a blast! 🚀 Miriam & I talked OpenAPI & RESTful APIs. Shout-out to @jaapcoomans.nl for a great talk on contract-first API testing with Quarkus – awesome demo of real dev enablement! 💥
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Jaap Coomans @jaapcoomans.nl · 02/04/2025
Thanks to those at @javaland.bsky.social who attended my session. The demo code and the slides are on github: github.com/jaapcoomans/...
github.com
GitHub - jaapcoomans/contract-first-api-testing: Demo project for Contract-first API Testing
Demo project for Contract-first API Testing. Contribute to jaapcoomans/contract-first-api-testing development by creating an account on GitHub.
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Jaap Coomans @jaapcoomans.nl · 02/04/2025
Good morning @javaland.bsky.social Ready for some early morning testing? I will be speaking about contract-first API testing with Quarkus in room Bergwerk at 09:00. See you there?
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Jaap Coomans @jaapcoomans.nl · 01/04/2025
Nice passionate story about the Lukashian Calendar by Gert-Jan Schouten. Nice to be in a room full of calendar geeks. #JavaLand
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Jaap Coomans @jaapcoomans.nl · 01/04/2025
Nice to be back at #JavaLand. First time for me at the Nürburgring. #Jatumba
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Jaap Coomans @jaapcoomans.nl · 20/03/2025
Had a blast at mini.CONF Episode X tonight. Fun topics, great conversations and good food. #KENNIS #group9
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Jaap Coomans @jaapcoomans.nl · 20/03/2025
Waiting for the mini.CONF keynote to start.
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Jaap Coomans @jaapcoomans.nl · 20/03/2025
Getting ready for mini.CONF, our yearly #group9 conference. This year marks the 10th edition 🎉 with some great external speakers! @jqno.nl, @timtebeek.github.io and @rijosam.com will be speaking tonight.
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Jaap Coomans @jaapcoomans.nl · 05/03/2025
That's a first... Received an email with a PowerPoint attached with a single slide in A4 paper size that contains a letter. If only a tool existed for sending digital letters...
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Jago de Vreede @jagovreede.bsky.social · 24/02/2025
Tomorrow I'll give a sneak preview of my #javaone talk about native multiplatform in Java at the @brabantjug.nl also @andresalmiray.com will be there taking about Going beyond ORMs www.meetup.com/nl-NL/braban...
meetup.com
BrabantJUG @ WAES Eindhoven, di 25 feb 2025, 17:00 | Meetup
On 25 February, BrabantJUG will be hosting our 11th meetup! We have 2 great speakers lined up for you. **Andres Almiray** will speak about **Going beyond ORMs** and **Jago
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Brian Vermeer @brianvermeer.nl · 03/02/2025
We are making some changes to our @nljug.bsky.social J-Spring conference. For starters, the CFP is open. Read the instructions and submit your talk.
buff.ly
J-Spring 2025: Call for Papers
Thursday June 5th, 2025 | Jaarbeurs, Utrecht, The NetherlandsJ-Spring is the Java Spring conference organized by the NLJUG for the Java community. ...
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Brabant JUG @brabantjug.nl · 03/02/2025
Our next meetup will be on 25 February at the WAES office in Eindhoven. We have 2 great speakers with awesome stories: @andresalmiray.com Going Beyond ORMs @jagovreede.bsky.social Building a multiplatform SDKMAN in JavaFX Register now to join www.meetup.com/nl-NL/braban...
meetup.com
BrabantJUG @ WAES Eindhoven, di 25 feb 2025, 17:00 | Meetup
On 25 February, BrabantJUG will be hosting our 11th meetup! We have 2 great speakers lined up for you. **Andres Almiray** will speak about **Going beyond ORMs** and **Jago
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Brabant JUG @brabantjug.nl · 11/12/2024
Our next speaker of today is @rijosam.com speaking about the lessons learned from a global team.
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Brabant JUG @brabantjug.nl · 11/12/2024
Right before the break our special guest @koturk.nl tells us about @amsterdam.voxxeddays.com
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Brabant JUG @brabantjug.nl · 11/12/2024
And we're off with the first session by Dirk Janssen.
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Jaap Coomans @jaapcoomans.nl · 29/11/2024
In the Netherlands 29 November marks the day of Sint Pannekoek (Saint Pancake) I wish you all a happy and blessed Saint Pancake.
Two pans with pancakes on a stove.
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Brabant JUG @brabantjug.nl · 29/11/2024
Just a little less than 2 weeks until our next meetup on 11 December at Ilionx in Den Bosch. Our speakers: @rijosam.bsky.social: Tulips to Turmeric: Lessons Learned from a Global Team Dirk Janssen: Application Life Cycle Management with 400+ interfaces www.meetup.com/brabant-jug/...
meetup.com
BrabantJUG @ Ilionx Den Bosch, Wed, Dec 11, 2024, 5:00 PM | Meetup
We are back with another meetup! This time we are very grateful to be welcomed by a new host: Ilionx in Den Bosch. For your evening of learning and inspiration we have two
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Jaap Coomans @jaapcoomans.nl · 19/11/2024
IMO terrible practice to introduce this as opt-out. Especially in a minor release. Our firewall has our back, but if this is #liquibase ethics to push FOSS users into a paid plan then I'll gladly reconsider using the tool at all.
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Jaap Coomans @jaapcoomans.nl · 07/11/2024
Remember, remember, the 13th of November (2006). Thanks @sharatchander.bsky.social #JFall
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Jaap Coomans @jaapcoomans.nl · 07/11/2024
@tcoolsit.bsky.social braving the keynote at #JFall
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Jaap Coomans @jaapcoomans.nl · 07/11/2024
First conference visit after a year of other priorities. Excited to be back 🤩 #jfall
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Jaap Coomans @jaapcoomans.nl · 05/09/2023
Unfortunately no @javazone.bsky.social for me this year. To manage my fomo I showed my kids the Oslo Spektrum this summer.
Me and my kids in front of the entrance of the Oslo Spektrum.
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Jaap Coomans @jaapcoomans.nl · 04/09/2023
I feel like I won the lottery! 🥳 Because well... I actually DID win the lottery! The prize? The right to purchase a @devoxx.bsky.social ticket! 🥳🥳🥳
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Jaap Coomans @jaapcoomans.nl · 02/07/2023
Using the bird app on my Android device kills my Mastodon and BlueSky feeds too. Guess it's eating up a lot of resources in the background while DDoS-ing itself because of the rate limit? No longer dare to touch it...
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