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

1. 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) 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) ShoppingListTag can find the child instances of ItemSimpleTag by calling getChildren() on the PageContext and casting each to an ItemSimpleTag.
E) ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling getParent() and casting the result to ShoppingListTag.

2. 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++; %>

3. Given that a scoped attribute cart exists only in a user's session, which two, taken independently, ensure the scoped attribute cart no longer exists? (Choose two.)

A) <c:remove var="${cart}" />
B) ${cart = null}
C) <c:remove var="${cart}" scope="session" />
D) <c:remove var="cart" />
E) <c:remove scope="session">cart</c:remove>
F) <c:remove var="cart" scope="session" />
G) <c:remove scope="session">${cart}</c:remove>

4. You are creating an error page that provides a user-friendly screen whenever a server exception occurs. You want to hide the stack trace, but you do want to provide the exception's error message to the user so the user can provide it to the customer service agent at your company. Which EL code snippet inserts this error message into the error page?

A) Message: <b>${pageContext.exception.errorMessage}</b>
B) Message: <b>${exception.errorMessage}</b>
C) Message: <b>${exception.message}</b>
D) Message: <b>${request.exception.errorMessage}</b>
E) Message: <b>${pageContext.exception.message}</b>
F) Message: <b>${request.exception.message}</b>

5. Which two are characteristics of the Transfer Object design pattern? (Choose two.)

A) It increases the complexity of the remote interface by removing coarse-grained methods.
B) It increases network performance introducing multiple fine-grained remote requests which return very small amounts of data.
C) It increases the complexity of the design due to remote synchronization and version control issues.
D) It reduces network traffic by collapsing multiple remote requests into one.

Solutions: