Sun Java System Web Server 7.0 Update 4 Developer's Guide to Java Web Applications

The LifecycleEvent Class

The LifecycleEventclass is an interface from the point of view to the developer, even if programmatically it is a class. This interface is the means by which these events are represented. This class informs you of the kind of event that happened through the getEventType() method and the data associated with the event (through the getData() method).