Java Servlet with Google App Engine

https://developers.google.com/appengine/downloads?hl=zh-TW#Google_App_Engine_SDK_for_Java

https://developers.google.com/appengine/docs/java/gettingstarted/

http://en.wikipedia.org/wiki/Java_Servlet

1. Create Application ID on GAE dashboard
2. Modify "application" tag in demos/guestbook/war/WEB-INF/appengine-web.xml
3. Update application (../../bin/appcfg.sh update war)

[Note] Looks like the index will not generate automatically, you need to put datastore-indexes.xml into war/WEB-INF dir