Spring is a well organized framework and IoC container that can be used in a modular way. In this article we are going to see how Spring can help us to develop applications by integrating it step by step into a tiny report engine. The main goal is the development of a engine that should be flexible enough to be used on a desktop as well as on a web client. The engine may access data stored in a database, file system or FTP server and in different formats like database columns, CSV or XML. Spring is going to play a key role because it facilitates the development of such an application based on reusable classes and interfaces.