Tag: web technology

Questions Related to web technology

What method can be used to retrieve all the parameter names being sent as part of the request by the client?

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  1. Use the method 'HttpServletRequest.getParameterNames()' which will return an enumeration of parameter names.

  2. Use the method 'HttpServletResponse.getParameterNames()' which will return an enumeration of parameter names.

  3. Use the method 'HttpServletRequest.getAllParameters()' which will return an enumeration of parameter names.

  4. There is no direct support in the Servlet API to retrieve the name of all the parameters sent by the client.

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Correct Option: A

What will be the output of the following JSP code snippet at run-time when it is accessed the third time? The value of test is

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  1. The value of the 'test' variable will be 2.

  2. The value of the 'test' variable will be 0.

  3. The value of the 'test' variable will be 1.

  4. The variable 'test' must be declared at global scope, else a run-time error will occur

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Correct Option: C

Following is an excerpt taken from a Deployment Descriptor of some Web Application. app-name MockQuestions ContextInfoServlet scwcd14.chap03.ContextInfoServlet app-name ContextInfoServlet Which of the following code will output the message 'MockQuestions ContextInfoServlet' to the client browser (assuming that 'out' is a valid instance of type 'PrintWriter' class)?

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  1. out.println(config.getServletContext().getParameter("app-name")); out.println(config.getInitParameter("app-name"));

  2. out.println(config.getInitParameter("app-name")); out.println(config.getServletContext().getInitParameter("app-name"));

  3. out.println(config.getServletContext().getInitParameter("app-name")); out.println(config.getInitParameter("app-name"));

  4. out.println(config.getServletContext().getInitParameter("app-name")); out.println(config.getParameter("app-name"));

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Correct Option: C

Which of the following EL expression retrieves the value of the attribute by name 'attribute' found in HTTP's request object
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  1. ${request.getAttribute()}

  2. ${request.attribute}

  3. ${pageContext.request.getAttribute()}

  4. ${pageContext.request.attribute}

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Correct Option: D

A software company wants to develop a component that does many of the pre-processing stuffs like whether the requests are coming from authentic sources, filtering unwanted data in the request object. What type of pattern will be the best match for developing such a component?

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  1. Front Controller

  2. Business Controller

  3. Business Delegate

  4. Intercepting Filter

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Correct Option: D

What method can be used to retrieve all the parameter names being sent as part of the request by the client?

technology web technology

  1. Use the method 'HttpServletRequest.getParameterNames()' which will return an enumeration of parameter names.

  2. Use the method 'HttpServletResponse.getParameterNames()' which will return an enumeration of parameter names.

  3. Use the method 'HttpServletRequest.getAllParameters()' which will return an enumeration of parameter names.

  4. There is no direct support in the Servlet API to retrieve the name of all the parameters sent by the client.

Show answer
Correct Option: A

What is the equivalent action code for the following piece of JSP code snippet? EmployeeBean harry = (EmployeeBean)request.getAttribute("harry"); if (harry == null) { harry = new EmployeeBean(); request.setAttribute("harry", harry); }

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Show answer
Correct Option: C

Which of the following EL expression retrieves the value of the attribute by name 'attribute' found in HTTP's request object
technology web technology

  1. ${request.getAttribute()}

  2. ${request.attribute}

  3. ${pageContext.request.getAttribute()}

  4. ${pageContext.request.attribute}

Show answer
Correct Option: D

What will be the output of the following JSP code snippet at run-time when it is accessed the third time? The value of test is

technology web technology

  1. The value of the 'test' variable will be 2.

  2. The value of the 'test' variable will be 0.

  3. The value of the 'test' variable will be 1.

  4. The variable 'test' must be declared at global scope, else a run-time error will occur

Show answer
Correct Option: C

Given the deployment descriptor for a Web Application is

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  1. The Servlet will output 'javabeat null' in the Server Console.

  2. The Servlet will fail to load as the init param property 'no-name' is not mentioned in the deployment descriptor

  3. A NullPointerException will be raised as calling getServletConfig() in the init() method will return a null reference.

  4. The Servlet will output 'javabeat ' in the Server Console.

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Correct Option: A