Roy van Rijn

How fast can you process 1 BILLION rows of weather data in #Java? 😳 @royvanrijn.com takes on one of the internet's favorite performance challenges, squeezing every last millisecond out of Java through profiling, optimization, and sheer engineering obsession. Watch: youtu.be/pHZF-zJ3Bpg?...

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. www.royvanrijn.com/anatomy-of-a...

Meet Chuck, an AI-powered runtime companion for your Java applications. www.linkedin.com/posts/royvan...

@dashorst.bsky.social Found wicket "in the wild"... not working though haha. Hey @ns.nl, your portal is broken...

Going to New Zealand in two weeks... and I'm still not convinced platypuses are real, I'm pretty sure it's just beavers-with-strap-on-beaks.

MELBOURNE, Australia, December 4th - #FashionTech Meet-Up, come join! RSVP through the site (free) #Robotics #SmartTextiles #ML #Sensors events.humanitix.com/fashiontech-... Melbourne Dec 1 - 6 Brisbane Dec 6 - 10 Sydney Dec 10 - 13 Canberra Dec 13 - 15 NZ Dec 15 - Jan 5

Really looking forward to see everybody at J-Fall's speakers dinner tonight, who's going to be there?

The em-dash is a clear indicator text was generated by AI. What is the em-dash of generated code?

Periodic reminder…

Respect to the man in the ice cream van! 🚐 🍦

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

First speaker of the day is @wbauweraerts.bsky.social on moving from fragile to fearless tests. Perfect breakdown on how testing should be used to be able to test and deploy with confidence 💪🏼

There are still some spots available for the next @rotterdamjug.bsky.social meetup: www.meetup.com/rotterdamjug... RSVP now!

Drinks with @openvalue.eu at #Devoxx (as usual)... See you there?

If you don’t pay for YouTube, you’ll get some unskippable ads… Sooooo if a software conference doesn’t pay their speakers, should they be allowed to sell in-talk ad-segments? 😂 “This talk is made possible by Squarespace/NordVPN/Raid Shadow Legends/Brilliant”

I'm once again looking for awesome speakers and topics for upcoming @rotterdamjug.bsky.social meetup(s). The next one is probably going to be in the week of 27 - 31 October... 👻 🎃 If you're interested, DM me!

☕️ Caffeine is inevitable. Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...

Seen this series (in progress) @gunnarmorling.dev ? youtu.be/n-YK3B4_xPA?...

Join @royvanrijn.com at #YOW25, where he shows how Java can fly in his talk "Pushing Java to the Limits: Processing a Billion Rows in Under 2 Seconds" MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com

Roy, it looks like there is a typo in your resume, it says Scumm Master instead of Scrum Master. ... Nope.

1 billion rows<2s. 🚀 @royvanrijn.com joins #YOW25 & shows how Java can fly in his talk "Pushing Java to the Limits: Processing a Billion Rows in Under 2 Seconds" MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com

He made Windows (tm)?

Best slogan I could come up with for a software company from Rotterdam 😅 Get your @openvalue.eu Rotterdam laptop sticker at @joyofcoding.bsky.social later this month 👍🏼

Join me tomorrow at @rotterdamjug.bsky.social (Java User Group) with @andresalmiray.com! Andres will talk about deploying to production with confidence and I'll share how to be more productive when working with multicultural teams. www.meetup.com/rotterdamjug...

Israel has its Iron Dome. America will get a Golden Dome. I propose a similar project for the Netherlands, we can call it… the Thunder Dome.

Last week I tried surimi, didn’t like it, it tastes like crab.

This is by far the best and scariest AI-generated creation I’ve come across. (made with Veo 3)

A shift is happening in our family's € 1000,- investment challenge... I've started to make a comeback, almost back into the green, my partner finally started to drop a little, and kid 1 is in a free fall 😅 📉

What if Elon Musk and Trump are actually launching a campaign against South Africa and try to make Elon president there? It’s a country full of rare earth minerals…

What do you call a group of developers that disagree with each other on XML standards? 🥁 A SOAP opera.

Wanted to take a shower but I suddenly have this incredible urge to complain and mumble “everything used to be better”… odd.

TIL: SAP HANA, do you know what “HANA” stands for? “HochleistungsANalyseAnwendung”

Found a jumping spider (Marpissa muscosa) with a cool beard.

Turns out it is not AI we should be worried about... it is humans as always. theguardian.com/technology/202… It seems Grok at least is rebelling and standing up against false information...

Code never lies, comments do.

I’m getting a crash course on the lore of Italian brainrot. And I’m 100% convinced teenagers these days would love Salvador Dali.

Has anyone combined AI speech recognition with AI text/token prediction? Imagine a system that listens to you and finishes your sentences. Where you have live subtitles with a predicted continuation. I think this is super scary to interact with.

Interview question? Explain the difference between: java.util.Vector<E> and jdk.incubator.vector.Vector<E>

May the Fourth be with you all… I hope your coffee is strong and the Force is stronger. ⭐️

This week: Microsoft: “30% of our code is written by AI” Google: “over 30% of all new code is written by AI” Meta: “within 12-18 months *most* code will be written by AI” Are you ready for this shift?

I mean, why *not* put yourself into Thunderbirds...