javax.servlet.http

## Interface HttpSessionListener

- All Superinterfaces:
    EventListener

      public interface HttpSessionListener
      extends EventListener

  Interface for receiving notification events about HttpSession lifecycle 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`.

  Implementations of this interface are invoked at their `sessionCreated(javax.servlet.http.HttpSessionEvent)` method in the order in which they have been declared, and at their `sessionDestroyed(javax.servlet.http.HttpSessionEvent)` method in reverse order.

  Since:
    Servlet 2.3
  See Also:
    `HttpSessionEvent`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `sessionCreated(HttpSessionEvent se)` Receives notification that a session has been created.
    `void` | `sessionDestroyed(HttpSessionEvent se)` Receives notification that a session is about to be invalidated.

- - ### Method Detail

    - #### sessionCreated

          void sessionCreated(HttpSessionEvent se)

      Receives notification that a session has been created.
      Parameters:
        `se` - the HttpSessionEvent containing the session

    - #### sessionDestroyed

          void sessionDestroyed(HttpSessionEvent se)

      Receives notification that a session is about to be invalidated.
      Parameters:
        `se` - the HttpSessionEvent containing the session

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