Tag: web technology

Questions Related to web technology

Which of the following statements are true about Java Servlets Technology?
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  1. A Servlet is a Server-side entity that will rest only on the Server.

  2. The life-cycle management of Servlets is done by the programmer.

  3. Java Servlet Technology provides support for handling XML requests through a special Servlet called XmlServlet.

  4. A Servlet instance is created by the client during the first request to the Servlet Container.

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Correct Option: A

Which of the following tags is used to set the timeout interval for HttpSession?

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  1. session-timeout

  2. session-min-time

  3. session-inactive-time

  4. session-interval-time

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Correct Option: A

Which of the following is used to define a Listener for HttpSessionListener class in Web Deployment Descriptor?

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  4. A listener for HttpSession cannot be specified statically inside a Deployment Descriptor, instead it can be programmatically mentioned.

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Correct Option: B

Which of the following listener(s) will be called when a Servlet Container initializes a Web Application?

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  1. ServletContextListener

  2. ApplicationListener

  3. ApplicationContextListener

  4. None of the above.

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Correct Option: A

Imagine that you want to set the inactive time for a particular servlet to 10 minutes. Which of the following is the preferred way to do it?

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  1. HttpSession.setMinInactiveInterval(10);

  2. HttpSession.setMinInactiveInterval(10 * 60);

  3. HttpSession.setMaxInactiveInterval(10 * 60);

  4. HttpSession.setMaxInactiveInterval(10);

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Correct Option: C

Which of the following method is used to send response in the form of character data to the client?
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  1. HttpServletRequest.getWriter();

  2. HttpServlerResponse.getCharacterWriter();

  3. HttpServetRequest.getOutputStream()

  4. HttpServletResonse.getWriter();

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Correct Option: D

Assuming that you are developing a Web Application called 'myApp'. You have a file called secret.txt which is part of the original Application, but you don't want your clients to gain access to it. What is the preferred way to do this?

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  1. Place the file 'secret.txt' in a directory called 'protected' in the 'myApp' Web Application.

  2. Place the file 'secret.txt' in a directory called 'private' in the 'myApp' Web Application.

  3. Place the file 'secret.txt' in a directory called 'WEB-INF' in the 'myApp' Web Application.

  4. Any filename starting with 'secret' are usually not accessible by the Clients, so this file can be places anywhere in the Web Application.

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Correct Option: C

Which of the following methods can be used to retrieve all the attributes names from ServletContext?

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  1. getAttributeNames()

  2. getAllAttributes()

  3. It is not possible to retrieve all the attributes in one call.

  4. getAttributes()

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Correct Option: A

Which of the following symbols is used to identifying the beginning of the query string and the consecutive name-value pairs in a request?
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  1. ? and &

  2. & and =

  3. ? and =

  4. % and &

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Correct Option: A

What will happen when the HttpSession.setAttribute() method is called the second time with the same attribute name?
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  1. An IllegalStateException exception will be thrown because of the presence of

  2. A second call to setAttribute() with the same attribute name will just replace the

  3. The behavior is not defined in the Servlet Specification.

  4. None of the above.

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Correct Option: B
Explanation:

To answer this question, the user needs to know about the HttpSession and its setAttribute() method.

Option A: This option is incorrect. IllegalStateException is thrown when we try to set an attribute on an already invalidated session, not when we set an attribute with the same name.

Option B: This option is correct. A second call to setAttribute() with the same attribute name will just replace the previous value associated with the attribute name with the new value.

Option C: This option is incorrect. The Servlet Specification does define the behavior of HttpSession.setAttribute() method when it is called the second time with the same attribute name.

Option D: This option is incorrect as option B is the correct answer.

Therefore, the correct answer is:

The Answer is: B. A second call to setAttribute() with the same attribute name will just replace the previous value associated with the attribute name with the new value.