JJUG CCC is the largest Java community event organized by Japan Java User Group (JJUG), held twice a year in spring and autumn. It provides great sessions of Java-related technologies and practices and brings together Java engineers from different disciplines.

Let's all get together and have a lively discussion about Java!

The venue is Bellesalle Shinjuku Grand Conference Center.

◎Date

• 30th May. 2026 (Sat) 9:30 AM - 05:15 PM JST

◎Event page

• JJUG CCC 2026 Spring

◎Sessions

• Sessions
• Speakers
• Timetable

◎Agreement on our Code of Conduct

All attendances of JJUG CCC 2026 Spring must agree and obey our Code of Conduct in the following:
- JJUG CCC Code of Conduct

◎Feedbacks

Please send us your feedback on the event and each session.
- For the event: Feedback for the Event
- For each session: Feedback for Sessions

◎HashTag

• #jjug_ccc
• hashtags for each track: #jjug_ccc_a, #jjug_ccc_c, #jjug_ccc_e, #jjug_ccc_f, #jjug_ccc_g, #jjug_ccc_i, #jjug_ccc_j, #jjug_ccc_l, #jjug_ccc_m