These are the release notes for Commons Collections v3.2.1:

Commons collections is a project to develop and maintain collection classes based on and inspired by the JDK collection framework. This project is JDK1.2 compatible, and does not use JDK1.5 generics.

This v3.2.1 release is simply a re-packaging of the v3.2 release, with appropriate OSGi meta data added to the jar's manifest file.

This release is fully source and binary compatible with v3.2. For changes since the v3.1 see the v3.2 Release Notes.