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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. Given a web application in which the request parameter productID contains a product identifier. Which two EL expressions evaluate the value of the productID? (Choose two.)

A) ${params.productID}
B) ${paramValues.productID}
C) ${pageContext.request.productID}
D) ${productID}
E) ${paramValues.productID[0]}
F) ${params.productID[1]}
G) ${param.productID}

2. Given:
1 . package com.example;
2 .
3 . public abstract class AbstractItem {
4 . private String name;
...
13. }
Assume a concrete class com.example.ConcreteItem extends com.example.AbstractItem.
A servlet sets a session-scoped attribute called "item" that is an instance of com.example.ConcreteItem and then forwards to a JSP page.
Which two are valid standard action invocations that expose a scripting variable to the JSP page? (Choose two.)

A) <jsp:useBean id="item" class="com.example.ConcreteItem"
scope="session" />
B) <jsp:useBean id="item" type="com.example.ConcreteItem"
class="com.example.AbstractItem"
scope="session" />
C) <jsp:useBean id="com.example.ConcreteItem"
scope="session" />
D) <jsp:useBean id="item" type="com.example.ConcreteItem"
scope="session" />

3. The sl:shoppingList and sl:item tags output a shopping list to the response and are used as follows:
1 1. <sl:shoppingList>
1 2. <sl:item name="Bread" />
1 3. <sl:item name="Milk" />
1 4. <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?

A) ShoppingListTag can find the child instances of ItemSimpleTag by calling super.getChildren() and casting each to an ItemSimpleTag.
B) ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling findAncestorWithClass() on the PageContext and casting the result to ShoppingListTag.
C) ShoppingListTag can find the child instances of ItemSimpleTag by calling getChildren() on the PageContext and casting each to an ItemSimpleTag.
D) ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling getParent() and casting the result to ShoppingListTag.
E) It is impossible for ItemSimpleTag and ShoppingListTag to find each other in a tag hierarchy because one is a Simple tag and the other is a Classic tag.

4. For debugging purposes, you need to record how many times a given JSP is invoked before the user's session has been created. The JSP's destroy method stores this information to a database. Which JSP code snippet keeps track of this count for the lifetime of the JSP page?

A) <%! int count = 0;
if ( request.getSession(false) == null ) count++; %>
B) <%! int count = 0; %>
< % if ( request.getSession(false) == null ) count++; %>
C) <% int count = 0;
if ( request.getSession(false) == null ) count++; %>
D) <%@ int count = 0; %>
< % if ( request.getSession(false) == null ) count++; %>
E) <%@ int count = 0;
if ( request.getSession(false) == null ) count++; %>

5. You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client's license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the <context-param> of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter. Which code snippet will accomplish this goal?

A) String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.setInitParameter('licenseExtension', DEFAULT);
}
B) You cannot do this because context parameters CANNOT be altered programmatically.
C) String ext = context.getAttribute('licenseExtension');
if ( ext == null ) {
context.setAttribute('licenseExtension', DEFAULT);
}
D) String ext = context.getParameter('licenseExtension');
if ( ext == null ) {
context.setParameter('licenseExtension', DEFAULT);
}
E) String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.resetInitParameter('licenseExtension', DEFAULT);
}

Solutions: