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JCON Conference
@jcon.one
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Java Community Conferences - in-person.

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JCON Conference @jcon.one · Dec 9
Our #BlindTicket phase has ended – thanks to everyone who trusted us 🫶

Now unlocked: #EarlyBird is live with 20% off #JCON EUROPE 2026 tickets.
Cinedom cinema vibes, #Java community energy, still cheap...for a bit.

Join us on April 20–23, 2026, in Cologne
2026.europe.jcon.one...
#JCON2026
jcon.one
Excited for #JCON EUROPE 2026? See Vadym Kazulkin at #JCON2026 in Cologne talking about 'Serverless #Java Web Applications on #AWS Lambda with #Micronaut #Quarkus and #SpringBoot'

In this talk, I will present and compare several approaches of…

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 13, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Tim te Beek & Rick Ossendrijver at #JCON2026 in Cologne giving a #workshop about 'Break Your #Testing Habits'

Old habits are hard to break; did you know starting #JUnit test methods with test was last …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 12, 2026 at 4:00 PM
jcon.one
We are happy to have JUG Noord back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 12, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Philip Riecks at #JCON2026 in Cologne talking about 'Testing #SpringBoot Applications Demystified'

Testing plays a crucial role in software #development, allowing you to catch #bugs, ensure your #code …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 12, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Jos Roseboom at #JCON2026 in Cologne talking about 'When #ORM Becomes OMG: Performance Pitfalls in #JPA and Friends'

JPA makes #database interaction feel almost #magical—until your app grinds to a halt …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 11, 2026 at 4:00 PM
jcon.one
We are happy to have Jozi-Jug back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 11, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Marc Philipp at #JCON2026 in Cologne talking about 'The Road to #JUnit 6'

2025 was an unusual year for JUnit. Thanks to the Sovereign #Tech Fund, I had the opportunity to work #fulltime on the project …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 11, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Konstantin Diener at #JCON2026 in Cologne talking about 'It's the Empathy, Stupid!'

Bill Clinton had the campaign slogan “It’s the #economy, stupid”. The underlying idea is that #healthy economy is the …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 10, 2026 at 4:00 PM
jcon.one
We are happy to have Quarkus Club back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 10, 2026 at 3:30 PM
jcon.one
Want the easiest conversation starter at a #Java conference?
Wear the #neon. Someone will ask about it. You’ll end up discussing #JDK features like it’s 1999. ⚡️😄

Shirt: 25€ (excl. VAT) → 2026.europe.jcon.one...

#JCON2026 #JCON
February 10, 2026 at 2:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Aicha Laafia at #JCON2026 in Cologne talking about 'What the Duck?🦆 The Hidden Crisis in #Tech'

We #smile in meetings 😊 ship features 🚀 and post #wins ✨
But under the #surface? Most of us are #paddling ...

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 10, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Jayashree S Kumar at #JCON2026 in Cologne talking about 'Beyond the Hype: Unpacking the Latest Features of #JDK'

In this session, lets a journey through #Java’s evolution, highlighting …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 9, 2026 at 4:00 PM
jcon.one
We are happy to have Nicaragua JUG back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 9, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Marco Belladelli at #JCON2026 in Cologne talking about 'Talk to Your #Data: Natural Language Data Access in #Java with #Hibernate #Quarkus and #LangChain4j'

Explore how Hibernate ORM, Quarkus, and …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 9, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Scott Sosna at #JCON2026 in Cologne talking about 'Your #Code Base as a Crime Scene'

The objective of the #boardgame Cluedo is to deduce how, where, and …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 8, 2026 at 4:00 PM
jcon.one
We are happy to have JUG Peru back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 8, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Anja Kunkel at #JCON2026 in Cologne talking about 'Why Bad Decisions Happen'

Have you ever been in the following situation? You know for certain …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 8, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Ronald Dehuysser at #JCON2026 in Cologne talking about 'Green #AI with #JobRunr: Sustainable Training and Inference on the #JVM'

AI is booming - but so are its energy costs and carbon #emissions. …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 7, 2026 at 4:00 PM
jcon.one
We are happy to have SIOUG back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 7, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Jonathan Vila at #JCON2026 in Cologne talking about 'Seven Habits of Highly Effective AI Java #Coding'

🤖 #AI code assistants are everywhere in #Java development! They …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 7, 2026 at 8:00 AM
jcon.one
We’re still blown away 🤯

Cay Horstmann just stands in the city hall of #Stockholm, where the #NobelPrizes are being awarded & casually invites YOU to #JCON EUROPE 2026!

Catch his session “When #Greed Is Good: Understanding #Java Stream Performance”

🎟️https://2026.europe.jcon.one/tickets
February 6, 2026 at 6:00 PM
jcon.one
Excited for #JCON EUROPE 2026? See Brian Sam-Bodden at #JCON2026 in Cologne talking about 'Design Patterns for Multi-Agent Systems'

Teams building #AI beyond a single #prompt now choose among different …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 6, 2026 at 4:00 PM
jcon.one
We are happy to have JUG Barranquilla back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: pretix.eu/impuls/eur...

Become a partner JUG: jcon.koeln/#partner
February 6, 2026 at 3:30 PM
jcon.one
Excited for #JCON EUROPE 2026? See Bouke Nijhuis at #JCON2026 in Cologne talking about 'Moving Towards the European #Cloud'

The European cloud is often talked about, but how does it actually …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 6, 2026 at 8:00 AM
jcon.one
Excited for #JCON EUROPE 2026? See Piet van Dongen at #JCON2026 in Cologne talking about 'Creating Effective and Objective Architectural Decision Records #ADRs'

#Documenting decisions is like eating your veggies as a kid: they …

🎟️ 2026.europe.jcon.one/tickets
Free for #JUG members
February 5, 2026 at 4:00 PM