Installing gems inside (J)Ruby code

Question

I am using JRuby along with Cucumber and is looking for a way of running

 jruby -S gem update --system
 jruby -S gem install cucumber

from within the Java ScriptEngine. No amount of Googling have let me to a solution to this problem. Basically I want to be able to do something like this

 ScriptEngineManager manager = new ScriptEngineManager();
 ScriptEngine jRubyEngine = manager.getEngineByName("jruby");
 : // some unknown code here
 jRubeEngine.eval("call gems install/update from inside JRuby")

Is there a way of accomplishing this?

In case anyone stumbles across this question, I recently created a screen cast here that might help: javajing.com/2012/06/01/ruby-from-java.html. I believe jruby-complete comes with a version of the gem command that you can make use of from java. For example, you can install the sass gem like so: java -jar jruby-complete-1.6.7.jar -S gem install -i ./sass-gems sass --no-rdoc --no-ri — Upgradingdave
– Upgradingdave, Commented Jul 11, 2012 at 12:25

Jörg W Mittag · Accepted Answer · 2010-02-12 16:34:17Z

7

RubyGems is just a Ruby library. The gem command is only a thin wrapper around the library. Everything you can do with the command, you can do with the library.

I've never actually used the library, but I guess what you want to look at is the Gem::DepencyInstaller and the code would look something like this (completely untested, just pulled out of my you-know-what):

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine jRubyEngine = manager.getEngineByName("jruby");
String s = "
  require 'rubygems'
  require 'rubygems/dependency_installer'
  Gem::DependencyInstaller.new.install('cucumber')
";
jRubyEngine.eval(s);

answered Feb 12, 2010 at 16:34

Jörg W Mittag

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