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| Listeners can either be [SessionListeners|SessionListener], [ContextListeners|ContextListener], or both. This is defined by which interface(s) they implement. |
| A listener is notified about various events, such as application or session events. |
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| !More Information |
| *[SessionListener|SessionListener] |
| *[ContextListener|ContextListener] |
| All listeners are defined the same way. Their function depends on which interface(s) they implement. |
| !Example code demonstrating the <[listener|web.xml.Listener]> and <[listener-class|web.xml.ListenerClass]> elements: |
| * [Context Listener] example, to listen for application create/destroy events |
| * [Session Listener] example, to listen for session create/destroy events |
| * [Session Attribute Listener] example, to listen for changes to session attributes |
| !See Also |
| * <[listener-class|web.xml.ListenerClass]> subelement |
