Eclipse refactoring can work in headless mode. We already have some code to analyse drls and get used classes and fields. 1) store all used classes and fields in a database 2) when a class refactoring is attempted use the database in 1) to select all the potentially impacted files and put them into a headless eclipse project 3) apply the refactoring and show the results to the user who may decline/accept(with commit comments) them. Accepting them results in each changed file being committed and the version increased. 4) allow additional work hooks, like deployment migration wizards/scripts to know what has changed as part of that patch. Any volunteers? I think the used fields currently only works on direct field accessors, bonus points will be needed to analyse expressions to also get the used classes and fields. Simples :) Mark