A developer wants a web application to be notified when the application is about to be shut down.
Which two actions are necessary to accomplish this goal？（）

Your web site has many user-customizable features， for ...

单项选择题

Your web site has many user-customizable features， for example font and color preferences on web pages.Your IT department has already built a subsystem for user preferences using the Java SE platform’s lang.util.prefs package APIs， and you have been ordered to reuse this subsystem in your web application. Youneed to create an event listener that constructs the preferences factory and stores it in the applicationscope for later use. Furthermore， this factory requires that the URL to a database must be declared in thedeployment descriptor like this：

Servlet A receives a request that it forwards to servle...

单项选择题

Servlet A receives a request that it forwards to servlet B within another web application in the same webcontainer. Servlet A needs to share data with servlet B and that data must not be visible to other servlets inA’s web application.
In which object can the data that A shares with B be stored？（）

The sl：shoppingList and sl：item tags output a shopping ...

单项选择题

The sl：shoppingList and sl：item tags output a shopping list to the response and are used as follows：
11.<sl：shoppingList>
12.<sl：item name="Bread" />
13.<sl：item name="Milk" />
14.<sl：item name="Eggs" />
15.</sl：shoppingList>
The tag handler for sl：shoppingList is ShoppingListTag and the tag handler for sl：item is ItemSimpleTag.ShoppingListTag extends BodyTagSupport and ItemSimpleTag extends SimpleTagSupport.Which is true？（）