Going ultra simple with JRuby, Tomcat and Rack

This one is for those that don't believe that web applications can be written in a single line :D With Rack and Warbler it is actually possible :D

First install the prerequisites and required gems as described in this post.

Create a file called config.ru with the following content

run lambda { |env| [ 200, { 'Content-Type'=>'text/plain' }, "Hello World!\n" ] }

Then run warbler like this:

jruby -S warble

... and deploy the resulting war file to tomcat. DONE!

Oh! And in case you were wondering: the performance of this application is just incredible! On a virtual machine with 2 cores at 2.19GHz each and 512MB RAM (Dell D830 laptop) it delivers around 2000 requests per second!

Ruby rocks!