Is it possible to stop Ruby scripts from importing Java in JRuby?

Question

From this page: https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby

In a Ruby script, if you use require 'java', the script will be able to create things like JFrames and such.

It may sound odd, but, is it possible, in any way, to not allow such feature (disable importing Java)?

If you are curious as to why am I asking, it is because I'm developing some kind of game engine on Java, but it allows users to script with Ruby to control the game logic - only the game logic. I don't want to give the freedom of creating JFrames.

Even if you forbid Java, what stops the user from calling any other GUI library? Calling sleep(10000000)? Deleting the home directory? — Mechanical snail
– Mechanical snail, Commented Jan 7, 2013 at 20:36
you might check this thread out: ruby.11.n6.nabble.com/Prevent-Ruby-calling-Java-td3479685.html — scrappedcola
– scrappedcola, Commented Jan 7, 2013 at 20:38

Charles Oliver Nutter · Accepted Answer · 2013-01-07 23:14:03Z

1

One hack would be to put 'java' into loaded features (the $" array). Requires would then assume it's already loaded and not try to load it again. A user could certainly remove it from that array, and try again, though.

answered Jan 7, 2013 at 23:14

Charles Oliver Nutter

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