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## javax.servlet.http
Interface HttpSessionBindingListener

All Superinterfaces:
  java.util.EventListener

public interface HttpSessionBindingListener
extends java.util.EventListener

This listener lets session values know when they've been added to or removed from a session. This particularly useful when a session value needs to free resources at the session end.

Method Summary
`void` | `valueBound(HttpSessionBindingEvent event)` Called when the object is added to a session.
`void` | `valueUnbound(HttpSessionBindingEvent event)` Called when the object is removed from a session or the session is invalidated.

Method Detail

### valueBound

    public void valueBound(HttpSessionBindingEvent event)

  Called when the object is added to a session.
  Parameters:
    `event` - session event object

### valueUnbound

    public void valueUnbound(HttpSessionBindingEvent event)

  Called when the object is removed from a session or the session is invalidated.
  Parameters:
    `event` - session event object

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