javax.servlet.http

## Interface HttpSessionIdListener

- All Superinterfaces:
    EventListener

      public interface HttpSessionIdListener
      extends EventListener

  Interface for receiving notification events about HttpSession id 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 3.1

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `sessionIdChanged(HttpSessionEvent event, String oldSessionId)` Receives notification that session id has been changed in a session.

- - ### Method Detail

    - #### sessionIdChanged

          void sessionIdChanged(HttpSessionEvent event,
                              String oldSessionId)

      Receives notification that session id has been changed in a session.
      Parameters:
        `event` - the HttpSessionBindingEvent containing the session and the name and (old) value of the attribute that was replaced
        `oldSessionId` - the old session id

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