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## javax.servlet.http
Interface HttpSessionAttributeListener

All Superinterfaces:
  java.util.EventListener

    public interface HttpSessionAttributeListener

extends java.util.EventListener

Interface for receiving notification events about HttpSession attribute changes.

In order to receive these notification events, the implementation class must be either declared in the deployment descriptor of the web application, annotated with `WebListener`, or registered via one of the addListener methods defined on `ServletContext`.

The order in which implementations of this interface are invoked is unspecified.

Since:
  Servlet 2.3

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

Method Detail

### attributeAdded

    void attributeAdded(HttpSessionBindingEvent event)

  Receives notification that an attribute has been added to a session.

  Parameters:
    `event` - the HttpSessionBindingEvent containing the session and the name and value of the attribute that was added

### attributeRemoved

    void attributeRemoved(HttpSessionBindingEvent event)

  Receives notification that an attribute has been removed from a session.

  Parameters:
    `event` - the HttpSessionBindingEvent containing the session and the name and value of the attribute that was removed

### attributeReplaced

    void attributeReplaced(HttpSessionBindingEvent event)

  Receives notification that an attribute has been replaced in a session.

  Parameters:
    `event` - the HttpSessionBindingEvent containing the session and the name and (old) value of the attribute that was replaced

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