Jgit-ant is a project mainly written in Java, it's free.
ant wrapper to jgit
Minimalistic ant tasks wrapping jGit (http://www.eclipse.org/jgit/)
REASON
I am setting up a CI build for RestFixture. As I don't have access to the hosted CI server I am using and not being able to install git, i need a fully self contained java implementation of git for the sake of supporting my CI build.
CHANGELOG:
version 0.0.1
DOCUMENTATION
See build.sample.xml