Servlet Objective Questions with Answers & Explanations

Practice Servlet MCQs with Detailed Explanations

Answer at least 12 questions to submit and verify answers.

31 Name the location of compiled class files within a war file? Select the one correct answer.

/META-INF/classes

/classes

/WEB-INF/classes

/root/classes

32 I have a web application on tomcat. Here many servlets open their own separate connection to database. To optimize this application, I decided to ask all servlet developers to use same db connection. I need to initialize this connection, before any servlet / jsp will be accessed. I got following suggestions from my developers. Which is the best way to do it?

Initialize connection in the servlet itself and save connection

Putting the connection in the webapps init parameter

Make the connection code in a filter for every servlet and save the connection.

Make the connection in a context listener and save it.

33 I have an attribute class Class User{ String name; String address; String phoneNo; boolean isLogged; } This class will be added to the session when user logs in and removed from the session when user logs out. I want its isLogged flag to be changed when user login and logs out. Using which listener I can do it?

javax.servlet.ServletContextAttributeListener

javax.servlet.ServletSessionAttributeListener

javax.servlet.http.HttpSessionAttributeListener

javax.servlet.http.HttpSessionBindingListener

34 Which of the following statement is correct. Select the one correct answer.

The response from the dedicated server to a HEAD request consists of status line, content type and the document.

The response from the server to a GET request does not contain a document.

The setStatus method defined in the HttpServletRequest class takes an int as an argument and sets the status of Http response

The HttpServletResponse defines constants like SC_NOT_FOUND that may be used as a parameter to setStatus method

35 To send text output in a response, the following method of HttpServletResponse may be used to get the appropriate Writer/Stream object. Select the one correct answer.

getStream

getOutputStream

getBinaryStream

getWriter

36 When using HTML forms which of the folowing is true for POST method? Select the one correct answer.

POST allows users to bookmark URLs with parameters.

The POST method should not be used when large amount of data needs to be transferred.

POST allows secure data transmission over the http method.

POST method sends data in the body of the request.

37 HttpServlet extends

javax.servlet.GenericServlet class

javax.servlet.http.GenericServlet class

javax.servlet.http.HttpServletRequest interface

javax.servlet.ServletInputStream class

38 Which statement is false ?

URL rewriting can be used to track a session.

SSL has a built in mechanism to obtain the data to define a session.

The name of session tracking cookies must be JSESSIONID.

There is no restriction for name of the cookie tracking the session.

39 Which of the following code retrieves the Internet Protocol (IP) address of the client that sent the request?

request.getRemoteAddr()

response.getRemoteAddr()

Header.getRemoteAddr()

None of the above.

40 Which of the following code can be used to force any content in the buffer to be written to the client?

request.flushBuffer()

response.flush()

response.flushBuffer()

None of the above.

41 Which element of web.xml is used to specify the error handler in servlets?

error-page

error-handler

exception

exception-handler

42 Which of the following is true about javax.servlet.error.message?

This attribute gives exact error message which can be stored and analysed after storing in a java.lang.String data type.

This attribute gives information about exception type which can be stored and analysed after storing in a java.lang.Class data type.

This attribute gives status code which can be stored and analysed after storing in a java.lang.Integer data type.

This attribute gives information about URL calling the servlet and it can be stored and analysed after storing in a java.lang.String data type.

43 Which of the following code is used to set auto refresh of a page after 5 seconds?

session.setIntHeader("Refresh", 5)

response.setIntHeader("Refresh", 5)

request.setIntHeader("Refresh", 5)

None of the above

44 How can we get context init parameter and run some code before rest of the application can service a client?

ServletContextAttributeListener

ServletContextListener

HttpSessionListener

None of the Above

45 If you want to track active session or how many users are there? So which listener you should use.

ServletRequestListener

ServletContextListener

HttpSessionListener

HttpSessionBindingListener

46 Suppose you want to know each time request comes in, so that you can log it. Which listener is appropriate for that?

ServletRequestListener

ServletRequestAttributeListener

ServletContextListener

HttpRequestListener

47 You have an attribute class, and you want object of this type should be notified when they are bound to or removed from a session. So which listener is appropriate one?

HttpSessionBindingListener

HttpSessionAttributeListener

HttpSessionListener

All of the above

Servlet Objective Questions and Answers - Set 3

Practice Servlet MCQs with Detailed Explanations

31 Name the location of compiled class files within a war file? Select the one correct answer.

34 Which of the following statement is correct. Select the one correct answer.

35 To send text output in a response, the following method of HttpServletResponse may be used to get the appropriate Writer/Stream object. Select the one correct answer.

36 When using HTML forms which of the folowing is true for POST method? Select the one correct answer.

37 HttpServlet extends

38 Which statement is false ?

39 Which of the following code retrieves the Internet Protocol (IP) address of the client that sent the request?

40 Which of the following code can be used to force any content in the buffer to be written to the client?

41 Which element of web.xml is used to specify the error handler in servlets?

42 Which of the following is true about javax.servlet.error.message?

43 Which of the following code is used to set auto refresh of a page after 5 seconds?

44 How can we get context init parameter and run some code before rest of the application can service a client?

45 If you want to track active session or how many users are there? So which listener you should use.

46 Suppose you want to know each time request comes in, so that you can log it. Which listener is appropriate for that?

47 You have an attribute class, and you want object of this type should be notified when they are bound to or removed from a session. So which listener is appropriate one?

48 Which of these protocols are supported by HttpServlet?