SCWCD : Building JSP Pages Using the Expression Language (EL) Mock Exam Practice Questions

Questions no -1 

If the servlet code

public class testServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
request.setAttribute("attribute1", "attribute1");
HttpSession session = request.getSession();
session.setAttribute("attribute2", "attribute2");
ServletContext application = getServletContext();
application.setAttribute("attribute3","attribute3");
RequestDispatcher dispatcher =
request.getRequestDispatcher("/test.jsp");
dispatcher.forward(request, response);
}
}

and in the test.jsp 

attribute1: 
attribute2: 
attribute3: 

What is the value of attribute1, attribute2, attribute3 ?



options
A)attribute1: attribute1 attribute2: attribute2 attribute3: attribute3
B)attribute1: attribute1 attribute2: null attribute3: null
C)attribute1: null attribute2: null attribute3: attribute3
D)attribute1: attribute1 attribute2: null attribute3: attribute3

Correct answer is : A

Explanations :  is same as  pageContext.findAttribute("attribute1").
pageContext.findAttribute() find in request then session then application scope.

Questions no -2 

If in test.jsp

${3+2-1} : 4

What is the output?



options
A)${3+2-1} : 4
B)$4 : 4
C)4 : 4
D)\4 : 4

Correct answer is : A

Explanations :
adding \ before EL , does not execute the EL.
${3+2-1} : 4 value is ${3+2-1} : 4