Many improvements have been made since the last 2.2.1 release in 2017: https://github.com/apache/commons-jcs/compare/commons-jcs-2.2.1...master
JOSM always has been using the latest SVN version of JCS without any known problems. We would like to switch to Apache Ivy for dependency management and thus require a published release.
Can you craft a new 2.3 release of JCS? Are there any blockers?