There are many concepts and techniques for creating loosely coupled applications, is one of them. Events can eliminate many of dependencies in your code. Some times without events, SRP* is very hard to implement. Observable interface in java can help us to implement events (through Observer Pattern).
But wait, the goal of this post is a fast tutorial about Spring Event. Spring has some nice facilities for creating Event Driven Applications. You can raise a specific event in a bean and listen to it in the other bean.