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POJruby Gems-in-a-jar issue
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copied!<p>I am trying to write some code in ruby (using jruby) to be compiled to java bytecode with jrubyc and deployed to a remote machine where it will be run on the JVM (no ruby available there).</p> <p>Everything works fine as long as I am happy to stick with the standard jruby library. As explained on the jruby website, I simply copy the jruby-complete.jar library to the remote machine and include it in the classpath at runtime. I fire my compiled script and it works: cool!</p> <p>The problems start when I need some other libraries (typically rubygems) to run my script.<br> I am aware of cool stuff like rawr, -which I successfully tested- to put together all you need in a single package. However that is not the solution I am looking for: I will have many small scripts to run independently and I don't want each of them to grow to at least 10 MB just because I insanely include the jruby-complete.jar in each of them.</p> <p>What I would like is to compile a .jar for each of the libraries that I will need to use, put all of them in a common folder on the remote machine and include them at runtime in the classpath when I run my compiled jruby scripts on the JVM.<br> This said, I tried to follow the instructions here: <a href="http://blog.nicksieger.com/articles/2009/01/10/jruby-1-1-6-gems-in-a-jar" rel="nofollow noreferrer">http://blog.nicksieger.com/articles/2009/01/10/jruby-1-1-6-gems-in-a-jar</a><br> I tried exactly the example shown there, with the "chronic" gem. Going step by step:</p> <ol> <li>Install the gem locally: java -jar jruby-complete-1.1.6.jar -S gem install -i ./chronic chronic --no-rdoc --no-ri</li> <li>Package it into a jar: jar cf chronic.jar -C chronic .</li> <li><p>Write a two lines test script, saving it as testt.rb:</p> <blockquote> <p>require 'chronic'<br> Chronic.parse('tomorrow')</p> </blockquote></li> <li><p>Compile with: jrubyc testt.rb</p></li> <li>Run the resulting java class testt.class with the following (having both jruby-complete.jar and chronic.jar in the same folder as the java class): java -cp .:/jruby-complete.jar:./chronic.jar testt</li> </ol> <p>I get the following error:</p> <p>Exception in thread "main" file:/Users/ave2/NetBeansProjects/jrubywatir/lib/jruby-complete.jar!/METAINF/jruby.home/lib/ruby/site_ruby/shared/builtin/core_ext/symbol.rb:1:in `const_missing': uninitialized constant Chronic (NameError)<br> from testt.rb:2<br> ...internal jruby stack elided...<br> from Module.const_missing(testt.rb:2)<br> from (unknown).(unknown)(:1) </p> <p>I really don't understand what I am doing wrong, and I am totally stuck on this. I am a noob in Ruby, much more used to Python: don't miss a chance to convert an infidel! :-) Thanks. </p>

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