Rakefile in atomic-0.0.2 vs Rakefile in atomic-0.0.3

@@ -6,5 +6,31 @@
 desc "Run tests"
 Rake::TestTask.new :test do |t|
   t.libs << "lib"
   t.test_files = FileList["test/**/*.rb"]
 end
+
+if defined?(JRUBY_VERSION)
+  require 'ant'
+
+  directory "pkg/classes"
+
+  desc "Clean up build artifacts"
+  task :clean do
+    rm_rf "pkg/classes"
+    rm_rf "lib/refqueue.jar"
+  end
+
+  desc "Compile the extension"
+  task :compile => "pkg/classes" do |t|
+    ant.javac :srcdir => "ext", :destdir => t.prerequisites.first,
+      :source => "1.5", :target => "1.5", :debug => true,
+      :classpath => "${java.class.path}:${sun.boot.class.path}"
+  end
+
+  desc "Build the jar"
+  task :jar => :compile do
+    ant.jar :basedir => "pkg/classes", :destfile => "lib/atomic_reference.jar", :includes => "**/*.class"
+  end
+
+  task :package => :jar
+end