Friends, I have happy to let you know that the revived and tested (more tests required) Jackrabbit 2 OCM has been uploaded here
http://code.google.com/p/jocm/ You can download the executable jar here http://jocm.googlecode.com/files/jacrabbit2-ocm-0.1.jar I will carry out tests for next couple of days and post detailed documentation too. In case we all agree I will move the code back into core Jackrabbit SVN. Let me know. ~dhrubo