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

1. You web application uses a lot of Java enumerated types in the domain model of the application. Built into each enum type is a method, getDisplay(), which returns a localized, user-oriented string. There are many uses for presenting enums within the web application, so your manager has asked you to create a custom tag that iterates over the set of enum values and processes the body of the tag once for each value; setting the value into a page-scoped attribute called, enumValue. Here is an example of how this tag is used:
1 0. <select name='season'>
1 1. <t:everyEnum type='com.example.Season'>
1 2. <option value='${enumValue}'>${enumValue.display}</option>
1 3. </t:everyEnum>
1 4. </select>
You have decided to use the Simple tag model to create this tag handler.
Which tag handler method will accomplish this goal?

A) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}
B) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(getJspContext().getWriter());
}
} (Exception e) { throw new JspException(e); }
}
C) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
pageContext.setAttribute("enumValue", value);
getJspBody().invoke(getOut());
}
} (Exception e) { throw new JspException(e); }
}
D) public void doTag() throw JspException {
try {
for ( Enum value : getEnumValues() ) {
getJspContext().setAttribute("enumValue", value);
getJspBody().invoke(null);
}
} (Exception e) { throw new JspException(e); }
}

2. Your web application requires the ability to load and remove web files dynamically to the web container's file system. Which two HTTP methods are used to perform these actions?
(Choose two.)

A) POST
B) DESTROY
C) PUT
D) DELETE
E) SEND
F) REMOVE

3. Given the definition of MyServlet:
1 1. public class MyServlet extends HttpServlet {
1 2. public void service(HttpServletRequest request,
1 3. HttpServletResponse response)
1 4. throws ServletException, IOException {
1 5. HttpSession session = request.getSession();
1 6 session.setAttribute("myAttribute","myAttributeValue");
1 7. session.invalidate();
1 8. response.getWriter().println("value=" +
1 9. session.getAttribute("myAttribute"));
2 0. }
2 1. }
What is the result when a request is sent to MyServlet?

A) An IllegalStateException is thrown at runtime.
B) The string "value=myAttributeValue" appears in the response stream.
C) The string "value=null" appears in the response stream.
D) An InvalidSessionException is thrown at runtime.

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

5. A developer has created a special servlet that is responsible for generating XML content that is sent to a data warehousing subsystem. This subsystem uses HTTP to request these large data files, which are compressed by the servlet to save internal network bandwidth.
The developer has received a request from management to create several more of these data warehousing servlets. The developer is about to copy and paste the compression code into each new servlet. Which design pattern can consolidate this compression code to be used by all of the data warehousing servlets?

A) Facade
B) View Helper
C) Composite Facade
D) Transfer Object
E) Intercepting Filter

Solutions: