Japan Java User Group Cross Community Conference

Japan Java User Group Cross Community Conference (JJUG CCC) is the largest Java community event in Japan, held twice yearly in spring and autumn. It features high-quality sessions on Java-related technologies and practical cases, providing a platform for Java developers to network and share knowledge. The 2025 Fall edition is planned as a fully in-person event in Tokyo with safety measures for COVID-19. JJUG also organizes monthly night seminars and supports local Java communities nationwide.