Can someone show me an application (other than a real time one) that can't be solved with simple javac my_script.java, tomcat, and a database of ones choosing?

Can someone show me an application (other than a real time one) that can't be solved with simple javac my_script.java, tomcat, and a database of ones choosing? Dare I say that it might even be possible to run twitter at scale with just a simple NoSQL database and some scripts?