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

1. Given the JSP code:
< % request.setAttribute("foo", "bar"); %>
and the Classic tag handler code:
5 . public int doStartTag() throws JspException {
6 . // insert code here
7 . // return int
8 . }
Assume there are no other "foo" attributes in the web application.
Which invocation on the pageContext object, inserted at line 6, assigns "bar" to the variable x?

A) String x = (String) pageContext.getAttribute("foo");
B) String x = (String)
pageContext.getRequest().getAttribute("foo");
C) String x = (String) pageContext.getRequestScope("foo");
D) It is NOT possible to access the pageContext object from within doStartTag.
E) String x = (String) pageContext.getAttribute("foo",
PageContext.ANY_SCOPE);

2. Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?

A) Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
B) Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
C) Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
D) Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.

3. Which mechanism requires the client to provide its public key certificate?

A) HTTPS Client Authentication
B) Form Based Authentication
C) HTTP Digest Authentication
D) HTTP Basic Authentication

4. Your web application views all have the same header, which includes the <title> tag in the
< head> element of the rendered HTML. You have decided to remove this redundant HTML code from your JSPs and put it into a single JSP called /WEB-INF/jsp/header.jsp.
However, the title of each page is unique, so you have decided to use a variable called pageTitle to parameterize this in the header JSP, like this:
10. <title>${param.pageTitle}<title>
Which JSP code snippet should you use in your main view JSPs to insert the header and pass the pageTitle variable?

A) <jsp:insert page='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:insert>
B) <jsp:include page='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:include>
C) <jsp:include page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageTitle' value='Welcome Page' />
< /jsp:include>
D) <jsp:include file='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:include>
E) <jsp:insert page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageTitle' value='Welcome Page' />
< /jsp:insert>

5. You are building a web application with a scheduling component. On the JSP, you need to show the current date, the date of the previous week, and the date of the next week. To help you present this information, you have created the following EL functions in the 'd' namespace:
name: curDate; signature: java.util.Date currentDate()
name: addWeek; signature: java.util.Date addWeek(java.util.Date, int)
name: dateString; signature: java.util.String getDateString(java.util.Date)
Which EL code snippet will generate the string for the previous week?

A) ${d:dateString(addWeek(curDate(), -1))}
B) ${d:dateString[addWeek[curDate[], -1]]}
C) ${d:dateString(d:addWeek(d:curDate(), -1))}
D) ${d:dateString[d:addWeek[d:curDate[], -1]]}

Solutions: