Sometimes unusual ideas are the best. What about holding a Java unconference at a relaxing hot spring (Onsen) deep in Japan? Having Java experts from Japan and all around the world together in a relaxing atmosphere to philosophize and exchange ideas.

This event started in 2017 . From 2020, the disorganizer will change from Sebastian & Stephen who are great Java Champions to JJUG (Japan Java User Group).

JOnsen 2020 dates are set.  Please reserve May 29th through May 31th.  The venue is Aomoriya in the northernmost of mainland Japan. 

The registration page was opened! Please join us!

Update 10/03/2020:
Due to concerns around the coronavirus (COVID-19), and in accordance with health guidance from the CDC, WHO, and other health authorities, we have decided to postpone JOnsen 2020. We intend to hold JOnsen 2020 in fall. We will announce the new dates as soon as the schedule is decided. We look forward to seeing you at JOnsen in fall! We thank you for your understanding and support.