I'm trying to make a Java program that allows users to do some limited scripting with a Ruby DSL that I've written. The script the user writes is saved to a Proc object in JRuby. The problem arises in that the user can still access methods that are standard to Ruby, such as File.new, or creating classes, or basically messing with other internal logic of the program or computer.
Is there a way to limit the user's script to only the constraints of the DSL, using JRuby or Ruby or even Java? Or at least to remove the user's access to certain classes?