Mattias Karlsson

Jfokus Developers Conference Sweden's largest developer conference focusing on Java, AI/ML, DevOps, and emerging technologies.

Looking forward to being part of the @jfokus.se 20 years anniversary edition 🤩!!!

I am honored to speak at such event about #Java performance and running machine learning models on GPU 💪!
Checkout all the cool topics and grab your ticket (limited availability) 🥳!!!

jfokus.se/schedule.html

Looking forward to speaking at @jfokus.se 2026!

I’ll be presenting “Level Up Your Java Streams with Gatherers” and show how gatherers can make your Java streams even more powerful.

📆 Feb 2–4
📍 Stockholm 🇸🇪

www.jfokus.se/talks.html?s...

Rumor has it there are still some tickets available 👀

Jfokus speaker banner with Shaun Smith and Fabio Niephaus presenting "GraaVM + Wasm: Fast, Efficient, Portable Apps".

I'm really looking forward to @jfokus.se which is coming up soon! It's always a great conference and you might still be able to find tickets so you can join @fniephaus.com and me as we sail our longship to the mysterious lands of #WebAssembly and @graalvm.org.

@jfokus.se is BACK for its 20th year and I’m so happy to be hosting a workshop on open source models & how to scale them up on #Kubernetes! We’ll feature projects including #vLLM + @langchain4j.dev + @promptfoo.bsky.social and more for enterprise AI deployment, app dev, and testing 🔥

🎃 Don’t fear the code!
Join #Jforum tonight with @hansolo.eu and Ove Lindström at DF Kompetens - talks on dependency hell & dead code 👻
Register here: jforum.confetti.events/jforum-125-m...
#community #developer #meetup

You have to start growing that beard and hair ;-)

🧵 Virtual Threads, Structured Concurrency & Scoped Values: Putting it all together with @balarawool.bsky.social (ING Bank).

Master the threads of Java’s new era ⚡
👉 www.jfokus.se

#Jfokus #DeveloperConference #Java #VirtualThreads #ProjectLoom #Concurrency #SpringBoot

Loved the discussion with Fredrik at @podsnack.se

Kodsnack 664 - På neutral plats, med Mattias Karlsson Fredrik snackar med Mattias Karlsson om Javaforums och Jfokus historia och nutid. Hur blir man plötsligt arrangör för en stor årlig konferens på bara 18 år? Mattias berättar om Javaforums historia och...

🎧 From Javaforum to Sweden’s biggest developer conference!

In this Kodsnack episode, Jfokus founder @matkar.bsky.social talks about the journey, lessons from organizing events and tips for aspiring speakers. 🇸🇪

👉 Listen (in Swedish):
kodsnack.se/664/
🔗 www.jfokus.se

#Jfokus #DeveloperConference

#DevoxxBE morning run with the @vaadin.com and @jfokus.se team. We are missing @theguywiththeduketattoo.com

#community #runningWithJakartaEE

Antwerp and @devoxx.com we meet again

Check out this newsletter!

🚀 Deep Dive Monday at #Jfokus — Building AI Agents with Spring & MCP with James Ward & Josh Long.

Learn to build RAG-ready, production-grade AI agents with Spring — fast & efficient. ⚡
www.jfokus.se

#DeveloperConference #AI #SpringBoot #MCP #RAG #Java #Agents

Hear, hear ..

Duke's Corner: Mattias Karlsson: I think it's Brilliant Jim Grisanzio from Oracle Java Developer Relations talks with Mattias Karlsson, Java Champion and prominent developer in the Java community who was also honored with the Java Community Lifetime Achiev...

Conversation with @matkar.bsky.social who was a recipient of the Java Community Lifetime Achievement recognition at Jfokus in 2024 by @sharatchander.bsky.social

dukescorner.libsyn.com/site/mattias...

YouTube video by Jfokus Trusting AI to Modernize Software at Scale by Tim te Beek

Generative AI can boost dev productivity ⚡— but scaling it safely is another story.

At AI-fokus 2024, Moderne showed how to design reliable workflows with OpenRewrite, validation, and context-aware tools.

Watch here 👉 youtu.be/ezkp0EI7AFo?...

#AIfokus #GenerativeAI #DevTools

That's a lot!

Thank you for your kind words. Its a great community :-)

Looking back at our brilliant Jfokus 2025 speakers ✨

Who will take the stage in 2026? 👉 CfS is open now! www.jfokus.se/iamahero

We have a @starbuxman.joshlong.com show at JUG Stockholm.

Scott "Java Man" McNealy at @javaone.bsky.social opening keynote

Thanks everyone!

Count me in!

Preparing for @devnexus.bsky.social together with the man @mayers.io

#Java peers, we have an amazing speaker line-up at #JavaOne 2025 including @jeanneboyarsky.bsky.social @frankgreco.bsky.social @lizeraes.bsky.social @mayers.io @matkar.bsky.social @venkats.bsky.social @brianvermeer.nl @maritvandijk.bsky.social . Register with J1D100_SM, save $100! javaone.com

I only have the SunSPOT...

Probably yes :-)

Bring the goodies ;-)

#Java peers, #JavaOne 2025 early bird reg ends on Feb 10. Sign up & save $100. Hear from Java luminaries such as @venkats.bsky.social @danvega.dev @starbuxman.joshlong.com @maritvandijk.bsky.social @malagupta.bsky.social @matkar.bsky.social @richard.fichtner.dev
Register here social.ora.cl/6018QnuQp

Today I started with winter running for the first time...