Which of the following is true about Execution phase in JSP life cycle?

Whenever a browser requests a JSP and the page has been loaded and initialized, the JSP engine invokes the _jspService() method in the JSP.

The _jspService() method of a JSP is invoked once per request and is responsible for generating the response for that request.

The _jspService() method of a JSP generates responses to all seven of the HTTP methods ie. GET, POST, DELETE etc.

What is the use of <c:if> tag?

It evaluates an expression and displays its body content only if the expression evaluates to true.

It is used to check if jsp tag library is enabled or not.

What is the use of <c:catch> tag?

To catch any Throwable that occurs in its body and optionally exposes it.

To catch the runtime error and redirect to error page.

Which of the following is true about <jsp:setProperty> action?

The setProperty action sets the properties of a Bean.

The Bean must have been previously defined before using setProperty action.

The method forward(request, response) will__?

return back to the same method from where the forward was invoked

not return back to the same method from where the forward was invoked and the web pages navigation continues

Which of the following code can be used to redirect user to different url?

response.sendRedirect(location)

What is the difference between doing an include or a forward with a RequestDispatcher?

The forward method transfers control to the designated resource, while the include method invokes the designated resource, substitutes its output dynamically in the display, and returns control to the calling page

The two methods provide the same functionality, but with different levels of persistence

The forward method is deprecated as of JSP 1.1 and the include method should be used in order to substitute portions of a dynamic display at runtime

The include method transfers control to a dynamic resource, while the forward method allows for dynamic substitution of another JPS pages output, returning control to the calling resource

Considering the following Servlet code, choose the statements which are true: package com.nullhaus; import javax.servlet.annotation.*; import javax.servlet.http.*; @WebServlet(name="NullServlet") public class NullServlet extends HttpServlet { }

This is an invalid usage of @WebServlet annotation

This is a valid usage of @WebServlet annotation

Which of the following request attributes that an error-handling servlet can access to analyse the nature of error/exception?

javax.servlet.error.status_code

javax.servlet.error.exception_type

Which of the following is true about request scope?

Object created with request scope are accessible only from the pages which are processing the same request.

Object created with request scope are accessible only from the page in which they are created.

Object created with request scope are accessible only from the pages which reside in same application.

Considering the following HTML form code snippet and the servlet code, what will be the result of servlet invocation after the form has been submitted?  <form action="myServlet?var=q1&var=q2" method="POST"> <input name="var" type="hidden" value="q3" /> <input type="submit" /> </form>  package com.nullhaus; import javax.servlet.annotation.*; import javax.servlet.http.*; import java.io.*; import java.util.*; @WebServlet("/myServlet") public class NullServlet extends HttpServlet { public void doPost(HttpServletRequest req, HttpServletResponse resp) { String[] param = req.getParameterValues("var"); resp.getWriter().println(Arrays.toString(param)); } }

The above code doesn’t compile

Which statements are true about the web applications created with Servlets 3.0? (Choose two)

The web.xml file is not required

The WEB-INF/ directory is not required

The WEB-INF/ directory is required

Which of the following code is used to update an attribute in a HTTP Session object in servlets?

session.setAttribute(name, value)

session.alterAttribute(name, value)

session.updateAttribute(name, value)

The getSession() method with 'true' as its parameter [ getSession(true) ] it will return the appropriate session object when__

The session object is passed to another method

Which of the following code is used to set the session timeout in servlets?

session.setMaxInactiveInterval(interval)

response.setMaxInactiveInterval(interval)

request.setMaxInactiveInterval(interval)

Which of the following code is used to add an attribute in a HTTP Session object in servlets?

session.setAttribute(name,value)

session.addAttribute(name,value)

session.createAttribute(name,value)

What are the true sentences about Session-Id?

Session-IDs are usually stored in the cookies, URLs and hidden fields of Web pages

A session-ID is an unique identification

It is transmitted between the client and the server

What is the purpose of session management?

To store information on the server-side between HTTP requests

To manage the user's login and logout activities

To store information on the client-side between HTTP requests

To tell the web container to keep the HTTP connection alive so it can make subsequent requests without thedelay of making the TCP connection

Which of the following are the session tracking techniques?

URL rewriting, using session object, using cookies, using hidden fields

URL rewriting, using session object, using response object, using hidden fields

URL rewriting, using servlet object, using response object, using cookies

URL rewriting, using request object, using response object, using session object

Consider the following Deployment Descriptor code snippet: ... <filter> <filter-name>NullFilter 1</filter-name> <filter-class>com.nullhaus.NullFilter</filter-class> </filter> ... and the following Filter code: package com.nullhaus; import javax.servlet.annotation.*; import javax.servlet.*; @WebFilter(urlPatterns = {"/*"}, filterName="NullFilter 1") public class NullFilter implements Filter { // necessary methods goes here } Knowing that above DD snippet is the only filter-related part, how many filter instances will be created by the Servlet container?

Deployment Descriptor is invalid and the runtime exception will be thrown

Where filters are defined?

Filters are defined in the deployment descriptor file web.xml.

Filters are defined in the jsp pages.

What are the mechanisms available in ServletContextListener interface?

contextInitialized((),contextDestroyed()

contextInit(), contextService(), contextDestroyed()

contextInitialized(), contextService(), contextDestroyed()

Which of the following is true about filters?

Servlet Filters are Java classes that can be used to intercept requests from a client before they access a resource at back end

Servlet Filters are Java classes that can be used to manipulate responses from server before they are sent back to the client

Javaweb

Authored by Phương Đình

English

University

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51 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The include() method of RequestDispatcher

Sends a request to another resource like servlet, jsp or html

Includes resource of file like servlet, jsp or html

Appends the request and response objects to the current servlet

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What programming language(s) or scripting language(s) does Java Server Pages (JSP) support?

VBScript only

Jscript only

Java only

VBScript, Jscript and Java

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A JSP is transformed into a(n):

Java Applet

Java Servlet

Java Script

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the key difference between using a <jsp:forward> and HttpServletResponse.sendRedirect()?

forward executes on the server while sendRedirect() executes on the client

forward executes on the client while sendRedirect() executes on the server

The two methods perform identically

None of these

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following can not be used as the scope when using a JavaBean with JSP ?

application

response

request

session

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is wrong with the following code ? <% if( strPassword.equals("boss")) { <jsp:forward page="Welcome.jsp" flush="true"/> } else { } %>

Unmatched bracket in for statement

Flush attribute must be false

Keyword 'file' should be used instead of 'page' in the action

Actions cannot be used within scriptlet blocks

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Choose the statement that best describes the relationship between JSP and servlets:

Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage

JSP and servlets are unrelated technologies

Servlets and JSP are competing technologies for handling web requests. Servlets are being superseded by JSP, which is preferred. The two technologies are not useful in combination

JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage

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