Servlet

Question 1

GenericServlet implements Servlet interface.
Select one:
a. True
b. False

Answer 1

a. True

Question 2

How do you write a message back to the browser from inside a Servlet?
Select one:
a. HttpWriter out = response.getHttpWriter( ) out.println(HTML code)
b. BufferedWriter writer = new BufferedWriter(new FileWriter()) writer.write(HTML code)
c. PrintWriter out = response.getWriter( ) out.println(HTML code) 
d. HtmlWriter out = response.get HtmlWriter ( ) out.println(HTML code)

Answer 2

c. PrintWriter out = response.getWriter( ) out.println(HTML code)

Question 3

How many times are each lifecycle method of a servlet called?
Select one:
a. init once per request, service once per request, destroy once per request
b. init once per request, service once per request, destroy once
c. init once, service once, destroy once
d. init once, service once per request, destroy once

Answer 3

c. init once, service once, destroy once

Question 4

How would you pre-initialize a servlet?
Select one:
a. Override the init(ServletConfig config) method 
b. Override the init( ) method
c. You cannot pre-initialize a servlet
d. Use the load-on-startup tag

Answer 4

b. Override the init( ) method

Question 5

True or False. When a servlet throws an exception, the web container searches the configurations in web.xml that use the exception-type element for a match with the thrown exception type.
Select one:
a. True
b. False

Answer 5

a. True

Question 6

What file is used to map servlet configuration information? Write its full relative path.
Select one:
a. web.xml
b. servlet.xml
c. WEB/INF/web.xml
d. WEB-INF/web.xml

Answer 6

d. WEB-INF/web.xml

Question 7

What is not a property of a well-formed XML document?
Select one:
a. All tags should be properly nested
b. Empty tags are necessary to close with a forward slash
c. XML tags are case sensitive
d. Every start tag does not need an end tag

Answer 7

d. Every start tag does not need an end tag

Question 8

What is the difference between HTTP GET and POST methods?
Select one:
a. GET requests do not remain in the browser history
b. GET requests have no restrictions on data length
c. POST requests cannot be bookmarked
d. GET requests are never cached

Answer 8

c. POST requests cannot be bookmarked

Question 9

What is the difference between request.getRequestDispatcher forward and response sendRedirect?
Select one:
a. Forward is performed internally by the client
b. Forward is marginally slower than a redirect, since it requires two browser requests, not one
c. With forward, objects placed in the original request scope are not available to the second request
d. Browser is completely unaware that a forward has taken place, so its original URL remains intact

Answer 9

d. Browser is completely unaware that a forward has taken place, so its original URL remains intact

Question 10

What is the difference between ServletConfig and ServletContext?
Select one:
a. ServletContext object is only available in a Servlet and not a JSP.
b. ServletContext is available to all servlets. ServletConfig is available to only one servlet.
c. ServletConfig is available to all servlets. ServletContext is available to only one servlet.
d. ServletConfig object is only available in a JSP.

Answer 10

b. ServletContext is available to all servlets. ServletConfig is available to only one servlet.

Question 11

What is the difference between the no-arg init( ) method and the init(ServletConfig config) method?
Select one:
a. Servlets do not have an init( ) method
b. Servlets do not have an init(ServletConfig config) method
c. init(ServletConfig config) is a convenience method meant to be overridden
d. init(ServletConfig config) is called by the Servlet Container to initialize a servlet

Answer 11

d. init(ServletConfig config) is called by the Servlet Container to initialize a servlet

Question 12

What is the method signature of the doPost method?
Select one:
a. protected void doPost(HttpServletRequest request, HttpServletResponse response)
b. public PrintWriter doPost(HttpServletRequest request)
c. public void doPost(HttpServletRequest request, HttpServletResponse response)
d. protected HttpServletResponse doPost(HttpServletRequest request)

Answer 12

a. protected void doPost(HttpServletRequest request, HttpServletResponse response)

Question 13

Which code will retrieve all the cookies sent in an HTTP message?
Select one:
a. request.getSession( ).getCookies( )
b. response.getCookies( )
c. this.getCookies( )
d. request.getCookies( )

Answer 13

d. request.getCookies( )

Question 14

Which code will store a cookie on the client computer?
Select one:
a. request.addCookie( )
b. response.addCookie( ) 
c. this.putCookie( )
d. request.getSession( ).putCookie( )

Answer 14

b. response.addCookie( )

Question 15

Which is NOT a JSTL core library function?
Select one:
a. if
b. forEach
c. choose
d. formatNumber

Answer 15

d. formatNumber

Question 16

Which is NOT a way to invalidate a session?
Select one:
a. Add deployment descriptor in web.xml using session-timeout tag
b. Use the session.invalidate( ) method.
c. Set the max inactive interval for the session to the desire amount. Session is then automatically terminated
d. Implement a log-out feature in your application.

Answer 16

d. Implement a log-out feature in your application.

Question 17

Which tag in web.xml is used to add values to the ServletConfig object?
Select one:
a. servlet-param 
b. init-param
c. context-param
d. config-param

Answer 17

b. init-param

Question 18

Which tag in web.xml is used to add values to the ServletContext object?
Select one:
a. context-param
b. config-param
c. servlet-param
d. init-param

Answer 18

a. context-param

Question 19

Which tags are used to register a servlet in web.xml?
Select one:
a. servlet, servlet-name, servlet-class 
b. servlet, servlet-name
c. servlet
d. servlet, servlet-class

Answer 19

a. servlet, servlet-name, servlet-class