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Gem bundler

A simple lib for bundling gems into jars. This obviously is intended for use with JRuby. Install the gem and create a rake task and a configuration file in your project:

your/config/gems.rb:

GemBundler.instance.configure do |g|
  g.gem "foo_gem"
  g.gem "path/to/a/gemfile/some_gem-0.3.2.gem" #version requirement will not work here
  g.gem "activerecord", ">= 2.3"

  g.setup "tmp/gems", "foo/lib"
end

Rake task:

require 'gem_bundler'
require 'path/to/your/config/gems.rb'

desc "Bundle gems into a JAR file"
task :bundle_gems do
  GemBundler.instance.bundle
end

This will install the configured gems into “tmp/gems” (this dir will be deleted, so be cautious), move any JAR files inside the gems to “foo/lib” and package the gems into “foo/lib/gems.jar”.

In your JRuby application you should put “foo/lib” onto your $LOAD_PATH (because the moved jars from the gems will probably be required) and require gems.jar.

See blog.nicksieger.com/articles/2009/01/10/jruby-1-1-6-gems-in-a-jar for details.

I use this mechanism to bundle gems to go with applications packaged using rawr.

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