HOWTO run the APE (or any jruby script) via Apache CGI

In my previous post, I was running the APE via the command line because I couldn't figure out how I could run it as a CGI in Apache. I don't really want to run Tomcat just for this, and I've had bad experiences with Tomcat administration both for school and for work (which I guess is basically the same thing at this point). So after a bout of searching the Internets, I had found a post on JRuby on Rails which helped me greatly in configuring it. So, without further ado, here's the relevant apache configuration snippet:

SetEnv JRUBY_HOME /usr/share/jruby[1]
SetEnv JAVA_HOME /usr/lib/jvm/sun-jdk-1.5[1]
# Jing dependencies
SetEnv CLASSPATH ...[2]
AddHandler cgi-script .rb
Options +ExecCGI

Notes:

1. These values are Gentoo-specific. For JAVA_HOME, I used Java 5 as a precaution, because I wouldn't be surprised if it didn't work in version 1.4.x.
2. On Gentoo, they put all of the third-party jars in separate directories so that their java-config utility can manage them all separately for the system and the users. So, the value I had here (which I didn't want to reproduce here because it's way too long) was the result of java-config -d -p jing. You probably don't have to put this line in if jruby can find jing by itself.

For the APE, I had to add #!/bin/bash /usr/bin/jruby to the top of it. For some reason, CGI complains if you leave out the /bin/bash part of it.