JOnsen 2023

Thu, 01 Jun 2023 11:00 - Sat, 03 Jun 2023 13:00 JST

Hoshino Resorts RISONARE Yatsugatake

129-1, Kobuchisawa-cho, Hokuto-shi, Yamanashi-Ken 408-0044


Registration is closed

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¥40,000 at the door
If you want to join with family, it is changed event fee. Check the detail information below.


Welcome to the most relaxed Java unconference in the world!

About JOnsen 2023

JOnsen is an unconference for Java Developers and Java Communities in Japan and all over the world.

JOnsen 2023 will be held at Hoshino Resorts RISONARE Yatsugatake in Yamanashi Prefecture, which is about a 2-hour train ride away from Tokyo and boasts beautiful nature and delicious food. If you would like to attend JOnsen Unconference, please apply via this page.

Please note that there is a limit to the number of rooms, so if registrations exceed the limit, we may need to select attendees after the application period has closed. To attend this event, you must receive the approval and payment request email from JJUG (Japan Java User Group), rather than from Doorkeeper. We will send this email from April 20th to 30th.

Participation fees

One person

room type fee (Adult) fee (under 12)
Sharing a room 40,000 JPY 30,000 JPY
  • Accommodation fee (2 nights)
  • Breakfast and Dinner

are included.

Children under 7 years old are free if they share a bed with parents.

Transportation and lunch are not included. Please arrange them by yourself.
(We may share restaurants info for lunch later)

If you want to occupy one room with your family

room type fee (Adult) fee (under 12)
Four people in a room 40,000 JPY 30,000 JPY
Three people in a room 50,000 JPY 35,000 JPY
Two people in a room 60,000 JPY 40,000 JPY

Children under 7 years old are free if they share a bed with parents.


The payment detail will be announced in the approval email.
At the moment, we are considering the following schedule, but please be aware it is not fixed yet.

  • The payment methods: Credit card via peatix
  • The payment deadline: 15th May (Anywhere on Earth!)
  • The approval email will be sent to you from 20th April :)

If you have any questions, please contact us using this contact page!

Draft Schedule

Date Time Content
6/1(Thu) 13:00 Meeting up at RISONARE Yatsugatake
13:30-14:00 Opening
14:00- Unconference 1
18:00- Dinner
6/2(Fri) 8:00- Breakfast
10:00- Unconferene 2
12:00- Lunch
13:00- Unconference 3
15:00- Activities
19:00- Dinner
6/3(Sat) 8:00- Breakfast
10:00- Unconference 4
12:00- Lunch and Break up

Official Web Site


  • Japan Java User Group
    • Shin Tanimoto
    • Maaya Ishida

About this community

日本Javaユーザーグループ/Japan Java User Group

日本Javaユーザーグループ/Japan Java User Group

日本におけるJavaユーザーグループです。 公式サイト/Official site

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