RotterdamJUG

Follow this account to get updates on meetings by the RotterdamJUG (Java User Group).

[Roy van Rijn @royvanrijn]

For curious developers 🧠

I built "The Anatomy of an LLM", an interactive explainer showing how text becomes tokens, vectors, attention, transformer blocks, and finally generated text.

https://t.co/fgCeZuQwJf

[RotterdamJUG @RotterdamJUG]

Second and last speaker today is the amazing @KoTurk77 talking about JobRunr.

Next time we’ll see each other is at @VoxxedAmsterdam 😬👌🏼

[RotterdamJUG @RotterdamJUG]

Understanding and practicing FP jargon with @ties_ven 🧠

[RotterdamJUG @RotterdamJUG]

🚀 RotterdamJUG meetup this Thursday in The Hague (hosted by RISA IT)!

🧠 Functional Programming in Java — @ties_ven
⚙️ Async Job Processing with JobRunr — @KoTurk77

🎟 Bonus: Ticket to @VoxxedAmsterdam Days Amsterdam to win!

📅 Mar 19 • ⏰ 17:30
👉 https://t.co/pMAMnpwxrw

[RotterdamJUG @RotterdamJUG]

Next up we’re learning how to use Agentic AI/MCP using Kotlin with @dstibbe

[RotterdamJUG @RotterdamJUG]

First speaker of the day is @wbauweraerts on moving from fragile to fearless tests.

Perfect breakdown on how testing should be used to be able to test and deploy with confidence 💪🏼

[RotterdamJUG @RotterdamJUG]

Fearless testing 😨 + Agentic AI 🤖

Two killer talks at the next #RotterdamJUG!

Speakers: David Stibbe & Wouter Bauweraerts

Host: Lunatech 💙

https://t.co/iseQpSke8F

[Roy van Rijn @royvanrijn]

I'm once again looking for awesome speakers and topics for upcoming @RotterdamJUG meetup(s).

The next one is probably going to be in the week of 27 - 31 October... 👻 🎃

If you're interested, DM me!

[RotterdamJUG @RotterdamJUG]

Already at his 16th Java User Group of this Java anniversary year… 😮 (☕️ 30 🎂)

It’s @aalmiray showing us how to deploy with confidence 🚀

[RotterdamJUG @RotterdamJUG]

There are still a few spots available for our next meetup, sign up now!

And/or… share this link with your colleagues and any developers you know in the Rotterdam/The Hague area ♥️

https://t.co/QsSdVgv7lD

[RotterdamJUG @RotterdamJUG]

Next month we have the amazing @aalmiray and Rijo Sam to share their experiences and knowledge.

This time from Rijswijk, at an office of @Konecranes.

Reserve your spot now:
https://t.co/QsSdVgv7lD

[RotterdamJUG @RotterdamJUG]

Come give us a visit at the @VoxxedAmsterdam JUG square on the top floor.

[RotterdamJUG @RotterdamJUG]

Next up we have last minute super-sub Victor Rentea (@VictorRentea), who’s here for @VoxxedAmsterdam tomorrow.

He’s not only wildly entertaining, but is also teaching us a valuable lesson about hexagonal architecture by looking at it from the time it was invented back in 2005.

[RotterdamJUG @RotterdamJUG]

After some amazing food, at today’s host NAVARA, we have the first speaker: Hinse (@coduinix) teaching us all about the new Gatherers in the Streams of Java 24.

[RotterdamJUG @RotterdamJUG]

There are just a few spots left for our next meetup, with @starbuxman and @hinseterschuur!

https://t.co/WnxFe3s7T0

Thanks again to @VoxxedAmsterdam for flying Josh in! ✈️ Be sure to get your tickets today for the inaugural VoxxedDays event in the Netherlands 🇳🇱

[Voxxed Days Amsterdam @VoxxedAmsterdam]

What an incredible meetup yesterday at @RotterdamJUG! 🎉

A huge thank you to @royvanrijn and Bart Kerkvliet for an inspiring evening. And to @WeAreFrankNL for hosting in the heart of Rotterdam 💜 The location, the atmosphere, everything was perfect!

Highlights of the evening:
The event started with @KoTurk77 representing Voxxed Days Amsterdam, sharing why developers can’t afford to miss this conference. Then, we dove into two fascinating talks:
- @dashorst (@topicusbv): The power of #htmx. Key takeaway: htmx lets you perform REST calls directly from your html, eliminating the need for complex JavaScript 🚀
- Niels Meijer (WeAreFrank!): Scaling with #hazelcast. It is a great platform with some key considerations for optimal use. 🛠️

Special thanks to Jaco de Groot, CTO of WeAreFrank, for the warm welcome and, of course, the delicious pizzas! 🍕

What’s next?
Monday: The @ingnl Backend Summit; we’re excited to see what’s in store!
Tuesday: The @ApeldoornJUG at the @Belastingdienst. Thanks to @anton_ruiter for hosting! Here’s the lineup:
- Jan-Willem van Hermon: A deep dive into #containerhosting.
- Bram Starmans-van den Hout: Exploring #portals and #forms.
📅 Join us! Register here:
https://t.co/4Sf3EA4ptV
Attendance is free and offers a great opportunity to share knowledge and expand your network.

Together, let’s keep building a stronger #java community! ✨

#RotterdamJUG #ApeldoornJUG #ING #community @voxxed @Devoxx #devoxx

[RotterdamJUG @RotterdamJUG]

Next up we have Niels from today’s host WeAreFrank!.

He’s sharing a war story on using @hazelcast to decouple and horizontally scale their framework.

[RotterdamJUG @RotterdamJUG]

After a short presentation and a raffle by @VoxxedAmsterdam with a golden ticket 🎫 (by @KoTurk77) we have the first presentation of this evening:

Martijn @Dashorst is trying to get us to join the cult of HTMX…

Let’s see if he can convert us.

[RotterdamJUG @RotterdamJUG]

@dashorst @htmx_org This evening we’ll all be *your* disciples @dashorst

[RotterdamJUG @RotterdamJUG]

@MaritvanDijk77 @AmsterdamJug @utrechtjug @JUGNoord @ApeldoornJUG Did it anyway: https://t.co/SJ0VxvVn3A

[RotterdamJUG @RotterdamJUG]

@MaritvanDijk77 @AmsterdamJug @utrechtjug @JUGNoord @ApeldoornJUG