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

1. Given a JSP page:
1 1. <n:recurse>
1 2. <n:recurse>
1 3. <n:recurse>
1 4. <n:recurse />
1 5. </n:recurse>
1 6. </n:recurse>
1 7. </n:recurse>
The tag handler for n:recurse extends SimpleTagSupport.
Assuming an n:recurse tag can either contain an empty body or another n:recurse tag, which strategy allows the tag handler for n:recurse to output the nesting depth of the deepest n:recurse tag?

A) Start a counter at 1. Call getChildTags(). If it returns null, output the value of the counter.
Otherwise, increment counter and continue from where getChildTags() is called. Skip processing of the body.
B) If the tag has a body, invoke the fragment for that body.Otherwise, start a counter at 1.
Call getParent(). If it returns null, output the value of the counter Otherwise, increment the counter and continue from where getParent() is called.
C) Create a private non-static attribute in the tag handler class called count of type int initialized to 0. Increment count in the doTag method. If the tag has a body, invoke the fragment for that body. Otherwise, output the value of count.
D) It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags.

2. Click the Exhibit button.
Assuming the tag library in the exhibit is imported with the prefix forum, which custom tag invocation produces a translation error in a JSP page?

A) <forum:message from="My Name" subject="My Subject">
< %= request.getParameter( "body" ) %>
< /forum:message>
B) <forum:message subject="My Subject">
My message body.
< /forum:message>
C) <forum:message from="My Name" subject="${param.subject}">
${param.body}
< /forum:message>
D) <forum:message from="My Name"
subject="<%= request.getParameter( "subject" ) %>">
My message body.
< /forum:message>
E) <forum:message from="My Name" subject="My Subject" />

3. Which path is required to be present within a WAR file?

A) /META-INF/index.xml
B) /classes
C) /WEB-INF/classes
D) /index.html
E) /WEB-INF/web.xml
F) /WEB-INF/index.html
G) /MANIFEST-INF

4. After a merger with another small business, your company has inherited a legacy WAR file but the original source files were lost. After reading the documentation of that web application, you discover that the WAR file contains a useful tag library that you want to reuse in your own webapp packaged as a WAR file.
What do you need to do to reuse this tag library?

A) Unpack the legacy WAR file, move the TLD file to the META-INF directory, repackage the whole thing as a JAR file, and place that JAR file in your webapp's library directory.
B) Unpack the legacy WAR file, move the TLD file to the META-INF directory, move the class files to the top-level directory, repackage the WAR, and place that WAR file in your webapp's WEB-INF directory.
C) Simply rename the legacy WAR file as a JAR file and place it in your webapp's library directory.
D) Unpack the legacy WAR file, move the TLD file to the META-INF directory, move the class files to the top-level directory, repackage the whole thing as a JAR file, and place that
JAR file in your webapp's library directory.

5. Given the web application deployment descriptor elements:
1 1. <filter>
1 2. <filter-name>ParamAdder</filter-name>
1 3. <filter-class>com.example.ParamAdder</filter-class>
1 4. </filter>
...
2 4. <filter-mapping>
2 5. <filter-name>ParamAdder</filter-name>
2 6. <servlet-name>MyServlet</servlet-name>
2 7. <!-- insert element here -->
2 8. </filter-mapping>
Which element, inserted at line 27, causes the ParamAdder filter to be applied when
MyServlet is invoked by another servlet using the RequestDispatcher.include method?

A) <include/>
B) <filter-condition>INCLUDE</filter-condition>
C) <filter-condition>include</filter-condition>
D) <dispatcher>INCLUDE</dispatcher>
E) <dispatcher>include</dispatcher>

Solutions: