This is a proof of concept to demonstrate we can:

• run a sinatra app with jRuby
• run the app in a Java servlet container (Tomcat)
• run the app in Google's Appengine

Contains a small ruby sinatra application under small_app.

Make sure you have a working JDK in your machine before starting!

Some prior experience with Java, Appengine and Ruby would be advisable.

Sinatra with jRuby

• Install the ruby version
• Install bundler

gem install bundler
cd small_app
bundle

• Start the application bundle exec rackup
• Point your browser to http://localhost:9292

Run under Tomcat

• Install warbler

gem install warbler
cd small_app
warble

Now our ruby app is packaged in a format suitable for Java containers.

• Download Apache Tomcat
• Uncompress anywhere
• Start the server bin/startup.sh
• Point your browser to http://localhost:8080
• Go to applications manager
• Install the war file the warbler created small_app.war
• Point your browser to http://localhost:8080/small_app Now you can stop tomcat with bin/shutdown.sh.

Run under Appengine

• Download the SDK
• Uncompress anywhere
• Uncompress the war file inside appengine's directory, or symlink to the uncompressed war that tomcat created in webapps/small_app.war

Appengine applications need an appengine-web.xml. Create one next to web.xml in your WEB-INF war folder with the following contents:

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  <application>YOUR_APP_NAME</application>
  <version>1</version>
  <threadsafe>true</threadsafe>
</appengine-web-app>

• Start the appengine server bin/dev_appserver.sh small_app
• Deploy to appengine production servers. You'll have to create an app first. bin/appcfg.sh update small_app