A Tweet Density Web Service using Spring MVC

This Christmas I was all alone at my home and was getting seriously bored so I thought of writing some code. I started searching the web for some programming questions. Within half an hour, I found a very nice site where a real world programming question was asked(by real world they meant not a purely algorithmic question rather a real world problem that can be deployed on Amazon EC2). The question was, given a userName and count of tweets, “What is the hourly Tweet Density of a twitter user”?.