Mattias Karlsson
@matkar.bsky.social
Jfokus founder, Java Champion, JUG leader, Software Vagabond, Family father, Motorcyclist & Kiva supporter. Check out @jfokus.bsky.social
Reposted by Mattias Karlsson
🎃 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
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
November 4, 2025 at 9:07 AM
🎃 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
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
Reposted by Mattias Karlsson
🧵 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
Master the threads of Java’s new era ⚡
👉 www.jfokus.se
#Jfokus #DeveloperConference #Java #VirtualThreads #ProjectLoom #Concurrency #SpringBoot
October 23, 2025 at 1:31 PM
🧵 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
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
Meetups - bäst utan Meetup?
Javaforums och @jfokus.se @matkar.bsky.social förklarar - tjänsten kanske inte riktigt är vad den en gång var längre.
Ett utdrag ur Kodsnack 664 - lyssna där poddar finns eller på kodsnack.se #podcast #meetups #konferenser
Javaforums och @jfokus.se @matkar.bsky.social förklarar - tjänsten kanske inte riktigt är vad den en gång var längre.
Ett utdrag ur Kodsnack 664 - lyssna där poddar finns eller på kodsnack.se #podcast #meetups #konferenser
October 9, 2025 at 2:02 PM
Loved the discussion with Fredrik at @podsnack.se
Reposted by Mattias Karlsson
🎧 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
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
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...
kodsnack.se
October 9, 2025 at 2:01 PM
🎧 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
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
#community #runningWithJakartaEE
October 9, 2025 at 5:35 AM
#DevoxxBE morning run with the @vaadin.com and @jfokus.se team. We are missing @theguywiththeduketattoo.com
#community #runningWithJakartaEE
#community #runningWithJakartaEE
Antwerp and @devoxx.com we meet again
October 6, 2025 at 4:12 PM
Antwerp and @devoxx.com we meet again
Check out this newsletter!
#Java peers:
Did you miss the September edition of the Java Newsletter? Content includes:
☕️ #Java25 release
☕️ Lifetime achievement interviews w/ @venkats.bsky.social @heinzkabutz.com @trishagee.bsky.social @matkar.bsky.social @horstmann.com @brjavaman.bsky.social
☕ and more!
➡️ tinyurl.com/mpswsd3e
Did you miss the September edition of the Java Newsletter? Content includes:
☕️ #Java25 release
☕️ Lifetime achievement interviews w/ @venkats.bsky.social @heinzkabutz.com @trishagee.bsky.social @matkar.bsky.social @horstmann.com @brjavaman.bsky.social
☕ and more!
➡️ tinyurl.com/mpswsd3e
October 6, 2025 at 9:42 AM
Check out this newsletter!
Reposted by Mattias Karlsson
🚀 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
Learn to build RAG-ready, production-grade AI agents with Spring — fast & efficient. ⚡
www.jfokus.se
#DeveloperConference #AI #SpringBoot #MCP #RAG #Java #Agents
October 6, 2025 at 9:27 AM
🚀 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
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 ..
Been reviewing submissions for @jfokus.se and while I've seen a lot of great talks pass by, I can't shake the feeling there are some viewpoints missing. 😉
So don't hold back your quirky, silly, weird or serious ideas for talks and submit them anyway! sessionize.com/jfokus-2026.
So don't hold back your quirky, silly, weird or serious ideas for talks and submit them anyway! sessionize.com/jfokus-2026.
Jfokus 2026: Call for Speakers
Jfokus is a general topics conference for a developer and tech audience. Jfokus conference, set to take place on February 2-4, 2026, at Stockholm Wate...
sessionize.com
September 21, 2025 at 7:46 PM
Hear, hear ..
Reposted by Mattias Karlsson
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...
dukescorner.libsyn.com/site/mattias...
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...
dukescorner.libsyn.com
September 15, 2025 at 3:59 PM
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...
dukescorner.libsyn.com/site/mattias...
Reposted by Mattias Karlsson
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
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
Trusting AI to Modernize Software at Scale by Tim te Beek
YouTube video by Jfokus
youtu.be
September 4, 2025 at 7:59 AM
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
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
Reposted by Mattias Karlsson
Looking back at our brilliant Jfokus 2025 speakers ✨
Who will take the stage in 2026? 👉 CfS is open now! www.jfokus.se/iamahero
Who will take the stage in 2026? 👉 CfS is open now! www.jfokus.se/iamahero
August 25, 2025 at 1:10 PM
Looking back at our brilliant Jfokus 2025 speakers ✨
Who will take the stage in 2026? 👉 CfS is open now! www.jfokus.se/iamahero
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.
May 20, 2025 at 5:31 PM
We have a @starbuxman.joshlong.com show at JUG Stockholm.
Scott "Java Man" McNealy at @javaone.bsky.social opening keynote
March 18, 2025 at 3:44 PM
Scott "Java Man" McNealy at @javaone.bsky.social opening keynote
Thanks everyone!
March 6, 2025 at 2:53 PM
Thanks everyone!
Count me in!
Reminder @devnexus.bsky.social! Meet at the Olympic Rings at the corner of Centennial Park at 6:30am tomorrow for a 5K morning run
I'll leave from the AC lobby at 6:25am
#runWithJakartaEE
#devnexus
I'll leave from the AC lobby at 6:25am
#runWithJakartaEE
#devnexus
March 5, 2025 at 1:41 AM
Count me in!
Preparing for @devnexus.bsky.social together with the man @mayers.io
March 2, 2025 at 12:36 AM
Preparing for @devnexus.bsky.social together with the man @mayers.io
Reposted by Mattias Karlsson
#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
February 25, 2025 at 4:00 PM
#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
Bring the goodies ;-)
I've started work on my "30 Years of Java" talk for @jfokus.se, and it's proving to be a lot of fun.
I just showed my son the Java ring and explained it had a computer in it. He did not seem convinced 😀
I've also got my PalmPilot up and running for the KVM and even a Livescribe Pulse smartpen.
I just showed my son the Java ring and explained it had a computer in it. He did not seem convinced 😀
I've also got my PalmPilot up and running for the KVM and even a Livescribe Pulse smartpen.
January 17, 2025 at 5:18 PM
Bring the goodies ;-)
Reposted by Mattias Karlsson
#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
Register here social.ora.cl/6018QnuQp
January 15, 2025 at 8:18 PM
#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
Register here social.ora.cl/6018QnuQp
Today I started with winter running for the first time...
January 14, 2025 at 5:19 PM
Today I started with winter running for the first time...
Closing 2024 with a leap of fait. Jump into 2025 with some fear, but hope for the best. Fear Less, Live More.
Happy New Year!
Happy New Year!
December 31, 2024 at 3:12 AM
Closing 2024 with a leap of fait. Jump into 2025 with some fear, but hope for the best. Fear Less, Live More.
Happy New Year!
Happy New Year!
Having a great time with @karianna.bsky.social
December 13, 2024 at 10:13 AM
Having a great time with @karianna.bsky.social
Some starter packs for newcomers to @bsky.app
Here are a few #Java and #JVM and #OpenJDK related starter packs:
Java Developer Community: bsky.app/starter-pack...
Java & JVM: bsky.app/starter-pack...
Java Champions: bsky.app/starter-pack...
Java Developer Community: bsky.app/starter-pack...
Java & JVM: bsky.app/starter-pack...
Java Champions: bsky.app/starter-pack...
bsky.app
December 4, 2024 at 8:48 PM
Some starter packs for newcomers to @bsky.app
Very nice dinner and planning with the @jfokus.se team!
November 30, 2024 at 7:54 AM
Very nice dinner and planning with the @jfokus.se team!