HttpSessionAttributeListener

Methods of HttpSessionAttributeListener interface

1. void attributeAdded(HttpSessionBindingEvent event): Receives notification that an attribute has been added to a session.
2.  void attributeRemoved(HttpSessionBindingEvent event): Receives notification that an attribute has been removed from a session.
3. void attributeReplaced(HttpSessionBindingEvent event): Receives notification that an attribute has been replaced in a session.