Enterprise application development is a gold mine for applications of AOP. There are many crosscutting concerns found in a typical enterprise application, ranging from well-known security and transaction management to application- and technology-specific concerns. Using AOP leads to implementations that are easy to understand and easy to change. When we combine Spring with AspectJ, we get a pragmatic AOP solution. This demo-driven session shows how to implement common functionality needed by typical enterprise applications, with a focus on web applications. We will start with a barebones web application and develop aspects to incrementally add functionalities such as monitoring, exception handling, policy enforcement, transaction management, fault tolerance, and domain-object security.