javax.servlet.http

## Interface HttpSessionAttributeListener

- All Superinterfaces:
    java.util.EventListener

      public 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:
    Servlet 2.3

- - ### Method Summary

    All Methods Instance Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `default void` | `attributeAdded(HttpSessionBindingEvent se)` Notification that an attribute has been added to a session.
    `default void` | `attributeRemoved(HttpSessionBindingEvent se)` Notification that an attribute has been removed from a session.
    `default void` | `attributeReplaced(HttpSessionBindingEvent se)` Notification that an attribute has been replaced in a session.

- - ### Method Detail

    - #### attributeAdded

          default void attributeAdded(HttpSessionBindingEvent se)

      Notification that an attribute has been added to a session. Called after the attribute is added. The default implementation is a NO-OP.
      Parameters:
        `se` - Information about the added attribute

    - #### attributeRemoved

          default void attributeRemoved(HttpSessionBindingEvent se)

      Notification that an attribute has been removed from a session. Called after the attribute is removed. The default implementation is a NO-OP.
      Parameters:
        `se` - Information about the removed attribute

    - #### attributeReplaced

          default void attributeReplaced(HttpSessionBindingEvent se)

      Notification that an attribute has been replaced in a session. Called after the attribute is replaced. The default implementation is a NO-OP.
      Parameters:
        `se` - Information about the replaced attribute

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