Hi, as mentioned Hibernate Validator is following suite and is not also on GitHub. Access is via: http://github.com/hibernate/hibernate-validator You find more info on how to get started with Validator here - http://community.jboss.org/wiki/ContributingtoHibernateValidator If you find inconsistent information somewhere let me know so that I can fix it. If you used to have access to the Validator code and you want to contribute let me know. --Hardy