You are looking for a way to create sevenzip archives in Java? The SevenzipArchiveOutputStream provided by this project is written completely in Java and uses the LZMA encoding classes from 7zip.org.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.