I need to compile my JRuby application into a standalone JAR file. How can I do this?
4 Answers
Check out rawr. It is a gem that packages your application in a JAR file.
If you want to compile for source code protection you must produce a .class file for each script in your project (as described here) and then replace the contents of the original script with
require 'the_corresponding_class_file'
for each of the compiled scripts.
To just run a script:
The JRuby site has a runnable JAR file that you can get at the JRuby download page. You want the JRuby complete JAR file. You can then run your application by doing
java -jar jruby-complete-1.4.0.jar <script>
I believe you can also build the same JAR file from source. In the downloaded source do
ant --projecthelp
To embed a Ruby script completely into a JAR file: Embedding JRuby in Java is a good starting point. You will probably want to unjar the jruby-complete.jar file, add your Java main class that either has the a callout to a JRuby script or has the Ruby code embedded in it, replace the manifest's main class to point to your new entry point, and jar it back up.
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