International Java Community Conference

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Free for all JUG Members !
1000x JUG tickets available.
First come first serve!

Recorded Sessions

Watch the recorded sessions of the last years


Latest from Twitter

Great! @silesiajug is back as a partner of #JCON2021! For all #JUG members we offer 1000 free #JavaUserGroup tickets, first come first serve! #JCON#java@Adam_…

22 hours ago

Great! @detroitjava is back as a partner of #JCON2021! For all #JUG members we offer 1000 free #JavaUserGroup tickets, first come first serve! #JCON#java@schu…

2 days ago

Wie #API-Gateways oder -Plattformen den Entwicklungsprozess von APIs nach der DevOps-Idee & dem CALMS-Modell positiv beeinflussen können, zeigt @dk_1977 im…

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3 days ago

Everybody talks about #CloudComputing & almost all want it. @siruslan talks to @MarkusKett about why he founded @Jelastic & how #Jelastic simplifies…

3 days ago

About JCON-ONLINE 2021

JCON-ONLINE 2021 is the big international Java community conference organized by the Java User Group Oberpfalz in cooperation with JAVAPRO Magazine. Java is our profession and JCON our passion and a lot of fun. We love to provide Java developers a spectacular 100% live conference that is open to the entire Java- User-Group communities world-wide.

Last year, more than 2,000 participants from 51 countries worldwide have joined the JCON- ONLINE 2020.

The 5th JCON edition is presented as an online live conference for the second time. All sessions will be streamed live and recorded.

Focus on Core Java & Cloud-Native Java

JCON traditionally focuses on Core Java, Serverside Java, APIs and Frameworks because that's what we as Java developers work with every day. However, the main topic will be Java-Cloud-Native and Microservices, because this is the future of Java and must-have for Java developers.


Core Java

Serverside Java

Cloud-Native Java & Microservices


Cloud Platforms & Container


Frameworks & APIs

JVM Languages




Agile & Culture




IDE & Tools

Database Development


JCON Content Board

Richard Fichtner

Founder JUG Oberpfalz, CEO of XDEV Software

Sven Ruppert

Developer Advocate at JFrog

Markus Kett

MicroStream, CEO & JAVAPRO Magazin, Chefredakteur

Matthias Gutheil

branch manager & software architect at Itemis

Sandra Ahlgrimm

Cloud Advocate at Microsoft

Sascha Hesse

Enterprise Architect Cloud Solutions at ALDI Nord SE & Co. oHG

Werner Keil

Director, Creative Arts & Technologies

parallel streams
main topics
live sessions

Featured Speakers 2021

Ivar Grimstad

Java Champion, Jakarta EE Developer Advocate
Eclipse Foundation

Emily Jiang

MicroProfile Guru,
STSM, Liberty Microservice Architect and Advocate

Graeme Rocher

Creator of Grails & Micronaut

Adam Bien

Freelancer, Buchautor, Java EE Experte

Reza Rahman

Principal Program Manager, Java on Azure at Microsoft

Eberhard Wolff


Hendrik Ebbers

Co-Founder & Senior Software Engineer
Karakun AG

Cesar Hernandez

Senior Software Engineer

Grace Jansen

IBM, Developer Advocate

Todd Sharp

Developer Advocate - Cloud And Autonomous DB

Mohamed Taman

Chief Solutions Architect @Effortel, JCP member, Speaker & Author

Mary Grygleski

Senior Developer Advocate at IBM and President of Chicago-JUG

Rory Preddy

Microsoft Senior Cloud Advocate

Diana Cheng

AWS Solutions Architect

Marcus Hellberg

Head of Community at Vaadin

Choose Your Ticket

JUG Pass - 4 Days


  • Access to all conference sessions
  • Q&A with speakers
  • Access to all recorded sessions
  • JUG members only

Full Pass - 4-Days


  • Access to all conference sessions
  • Q&A with speakers
  • Access to all recorded sessions


UCI Cinema Duesseldorf, Germany, 2019

Our Partners 2021

Since the start of JCON, it has been the continuous support from companies and organizations partnering with us to help create events that bring the Java community together. We thank each and every one of our partners for their fantastic support! Please take a few minutes to learn about our partners and let them know you appreciate their support of our community! 

Are you interested in partnering with us? Please stop by our sponsorship page


Store and load any Java Object Graph or Subgraphs partially, Relieved of Heavy-weight JPA. Microsecond Response Time. Ultra-High Throughput. Minimum of Latencies. Create Ultra-Fast In-Memory Database Applications & Microservices.

Azul, provider of the Java platform for the modern cloud enterprise,is the only company 100% focused on Java. Millions of Java developers, hundreds of millions of devices and the world’s most highly regarded businesses trust Azul to power their applications.

XDEV Software GmbH, based in Weiden/Bavaria, is a German software development company specializing in Java. Among other things, XDEV is the maintainer of various open-source developer tools.

Payara Services is a global open source company and a recognized leader in the creation of innovative infrastructure software for today and tomorrow. We provide industry-leading expertise, products, and services that enable our users to create world-class solutions across a diverse range of industries.

RapidClipse X is a visual Java development environment for the fast and efficient development of individual business applications. Save up to 90% development time.


Java User Group Oberpfalz is an open community to exchange ideas on current topics relating to the application of Java technology in Bavaria / Germany.

We offer contacts and exchanges within the regional Java community and regular talks and discussions on current Java topics.

JAVAPRO is the very first professional magazine for Java which is free of charge.