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Q. Implementation of interface HttpSessionListener

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Book : Java 2 Web Component Developer [Levi, Sybex]

These are the methods that an implementing class must define:
void sessionCreated(HttpSessionEvent e) This method is called when a session is created.
void sessionDestroyed(HttpSessionEvent e) This method is called to identify that a session has been invalidated.

Why is the second method correctly defined in the following example?
public void
(File)sess.getAttributeDestroyed(HttpSessionEvent e)

Consider Paul's rocket mass heater.
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