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

1. You are building JSP pages that have a set of menus that are visible based on a user's security role. These menus are hand-crafted by your web design team; for example, the
SalesManager role has a menu in the file /WEB-INF/html/sales-mgr-menu.html. Which JSP code snippet should be used to make this menu visible to the user?

A) <jsp:if test='request.isUserInRole("SalesManager")'>
< jsp:include file='/WEB-INF/html/sales-mgr-menu.html' />
< /jsp:if>
B) <% if ( request.isUserInRole("SalesManager") ) { %>
< %@ include file='/WEB-INF/html/sales-mgr-menu.html' %>
< % } %>
C) <% if ( request.isUserInRole("SalesManager") ) { %>
< jsp:include file='/WEB-INF/html/sales-mgr-menu.html' />
< % } %>
D) <jsp:if test='request.isUserInRole("SalesManager")'>
< %@ include file='/WEB-INF/html/sales-mgr-menu.html' %>
< /jsp:if>

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

3. You want to create a filter for your web application and your filter will implement javax.servlet.Filter.
Which two statements are true? (Choose two.)

A) Your filter class must also implement javax.servlet.FilterChain.
B) Your filter class must implement a doFilter method that takes, among other things, an
HTTPServletRequest object and an HTTPServletResponse object.
C) Your filter class must implement an init method and a destroy method.
D) The method that your filter invokes on the object it received that implements javax.servlet.FilterChain can invoke either another filter or a servlet.
E) When your filter chains to the next filter, it should pass the same arguments it received in its doFilter method.

4. You have built your own light-weight templating mechanism. Your servlets, which handle each request, dispatch the request to one of a small set of template JSP pages. Each template JSP controls the layout of the view by inserting the header, body, and footer elements into specific locations within the template page. The URLs for these three elements are stored in request-scoped variables called, headerURL, bodyURL, and footerURL, respectively. These attribute names are never used for other purposes. Which
JSP code snippet should be used in the template JSP to insert the JSP content for the body of the page?

A) <jsp:include page='<%= bodyURL %>' />
B) <jsp:include page='${bodyURL}' />
C) <jsp:include file='${bodyURL}' />
D) <jsp:insert page='<%= bodyURL %>' />
E) <jsp:insert file='${bodyURL}' />
F) <jsp:insert page='${bodyURL}' />

5. Within the web application deployment descriptor, which defines a valid JNDI environment entry?

A) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-type>java.lang.String</env-entry-type>
< env-entry-value>This is an Example</env-entry-value>
< /env-entry>
B) <env-entry>
< env-entry-type>java.lang.Boolean</env-entry-type>
< env-entry-value>true</env-entry-value>
< /env-entry>
C) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-value>This is an Example</env-entry-value>
< /env-entry>
D) <env-entry>
< env-entry-name>param/MyExampleString</env-entry-name>
< env-entry-type>int</env-entry-type>
< env-entry-value>10</env-entry-value>
< /env-entry>

Solutions: