HttpSessionActivationListener的用法？

[yi_zhangy]

• A container notifies all of the session attributes that implement the HttpSessionActivationListener interface when it migrates the session.
scwcd kit上面的一段话：字面意思是说当session在多个容器中移动的时候会触发所有session attribute 中实现HttpSessionActivationListener的对象。(我自己理解)

但我觉得应该是触发配置在web.xml中的HttpSessionActivationListener对象。如果两个容器直接移动
那2个容器配置的HttpSessionActivationListener是不是都应该被触发呢？
你们看怎么解释？

[yi_zhangy]

8. Which of the following is not a requirement of a distributable web application?
(Select one)
a It cannot depend on the notification events generated due to changes in the
ServletContext attribute list.
b It cannot depend on the notification events generated due to changes in the
session attribute list.
c It cannot depend on the notification events generated when a session is activated
or passivated.
d It cannot depend on the notification events generated when ServletContext
is created or destroyed.
e It cannot depend on the notification events generated when a session is created
or destroyed.
应该选什么？我觉得是c 你们怎么看？

[yi_zhangy]

大家回答一下咯