HttpSessionAttributeListener (Servlet 5.0 API Documentation - Apache Tomcat 10.0.27)

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	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