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## javax.servlet.http
Interface HttpSessionAttributeListener

public abstract interface HttpSessionAttributeListener
extends java.util.EventListener

This listener interface can be implemented in order to get notifications of changes to the attribute lists of sessions within this web application.

Since:
  v 2.3

Method Summary
`void` | `attributeAdded(HttpSessionBindingEvent se)` Notification that an attribute has been added to a session.
`void` | `attributeRemoved(HttpSessionBindingEvent se)` Notification that an attribute has been removed from a session.
`void` | `attributeReplaced(HttpSessionBindingEvent se)` Notification that an attribute has been replaced in a session.

Method Detail

### attributeAdded

    public void attributeAdded(HttpSessionBindingEvent se)

  Notification that an attribute has been added to a session. Called after the attribute is added.

### attributeRemoved

    public void attributeRemoved(HttpSessionBindingEvent se)

  Notification that an attribute has been removed from a session. Called after the attribute is removed.

### attributeReplaced

    public void attributeReplaced(HttpSessionBindingEvent se)

  Notification that an attribute has been replaced in a session. Called after the attribute is replaced.

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