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

1. Which activity supports the data integrity requirements of an application?

A) using HTTP Basic authentication
B) using an LDAP security realm
C) using HTTPS as a protocol
D) using forms-based authentication

2. Click the Exhibit button.
Given:
1 1. <% com.example.Advisor advisor = new com.example.Advisor(); %>
1 2. <% request.setAttribute("foo", advisor); %>
Assuming there are no other "foo" attributes in the web application, which three are valid
EL expressions for retrieving the advice property of advisor? (Choose three.)

A) ${requestScope["foo"["advice"]]}
B) ${request.foo.advice}
C) ${foo.advice}
D) ${requestScope[foo[advice]]}
E) ${requestScope["foo"]["advice"]}
F) ${requestScope.foo.advice}

3. Given:
1 . <% int[] nums = {42,420,4200};
2 . request.setAttribute("foo", nums); %>
3 . ${5 + 3 lt 6}
4 . ${requestScope['foo'][0] ne 10 div 0}
5 . ${10 div 0}
What is the result?

A) false true
B) false true 0
C) An exception is thrown.
D) true true Infinity
E) Compilation or translation fails.
F) false true Infinity
G) true true

4. You have been contracted to create a web site for a free dating service. One feature is the ability for one client to send a message to another client, which is displayed in the latter client's private page. Your contract explicitly states that security is a high priority.
Therefore, you need to prevent cross-site hacking in which one user inserts JavaScript code that is then rendered and invoked when another user views that content. Which two
JSTL code snippets will prevent cross-site hacking in the scenario above? (Choose two.)

A) <c:out>${message}</c:out>
B) <c:out value='${message}' />
C) <c:out value='${message}' eliminateXml='true' />
D) <c:out value='${message}' escapeXml='true' />
E) <c:out eliminateXml='true'>${message}</c:out>

5. 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) ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling getParent() and casting the result to ShoppingListTag.
B) ShoppingListTag can find the child instances of ItemSimpleTag by calling getChildren() on the PageContext and casting each to an ItemSimpleTag.
C) 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.
D) ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling findAncestorWithClass() on the PageContext and casting the result to ShoppingListTag.
E) ShoppingListTag can find the child instances of ItemSimpleTag by calling super.getChildren() and casting each to an ItemSimpleTag.

Solutions: