Java SCWCD MCQ 2024, OCWCD Quiz, Java OCWCD Online Test

You are creating an error page that provides a user-friendly screen whenever a server exception occurs. You want to hide the stack trace, but you do want to provide the exception’s error message to the user so the user can provide it to the customer service agent at your company. Which EL code snippet inserts this error message into the error page?

Which statement is true if the doStartTag method returns EVAL_BODY_BUFFERED ?

Which basic authentication type is optional for a J2EE 1.4 compliant web container?

Which one directives are applicable only to tag files?

Given:
1. package com.example;
2.
3. public abstract class AbstractItem {
4. private String name;
…
13. }
Assume a concrete class com.example.ConcreteItem extends
com.example.AbstractItem. A servlet sets a session-scoped attribute called “item” that
is an instance of com.example.ConcreteItem and then forwards to a JSP page. Which
one is valid standard action invocations that expose a scripting variable to the JSP
page?

Which JSTL code snippet can be used to import content from another web resource?

A developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in a thread-safe manner. Which one can support this design goal?

For which one events can web application event listeners be registered?

You need to store a floating point number, called Tsquare, in the session scope. Which one code snippets allow you to retrieve this value?

Given: String value = getServletContext().getInitParameter(“foo”); in an HttpServlet
and a web application deployment descriptor that contains:
<context-param> <param-name>foo</param-name>
<param-value>frodo</param-value></context-param>
Which one are true?

You want to create a valid directory structure for your Java EE web application, and you want to put your web application into a WAR file called MyApp.war. Which one are true about the WAR file?

Given:
11. <servlet>
12. <servlet-name>catalog</servlet-name>
13. <jsp-file>/catalogTemplate.jsp</jsp-file>
<load-on-startup>10</load-on-startup>
15. </servlet>
Which one are true?

Your web application uses a simple architecture in which servlets handle requests and then forward to a JSP using a request dispatcher. You need to pass information calculated in the servlet to the JSP for view generation. This information must NOT be accessible to any other servlet, JSP or session in the webapp. Which one techniques can you use to accomplish this goal?

Given a Filter class definition with this method:
21. public void doFilter(ServletRequest request,
22. ServletResponse response,
23. FilterChain chain)
24. throws ServletException, IOException {
25. // insert code here
26. }
Which should you insert at line 25 to properly invoke the next filter in the chain, or the target servlet if there are no more filters?

Which path is required to be present within a WAR file?

Which one security mechanisms can be directed through a sub-element of the <userdata- constraint> element in a web application deployment descriptor?

Given an HttpServletRequest request:
22. String id = request.getParameter(“jsessionid”);
23. // insert code here
24. String name = (String) session.getAttribute(“name”);
Which one can be placed at line 23 to retrieve an existing HttpSession object?

A developer for the company web site has been told that users may turn off cookie support in their browsers. What must the developer do to ensure that these customers can still use the web application?

Which security mechanism uses the concept of a realm?

You are developing several tag libraries that will be sold for development of thirdparty web applications. You are about to publish the first three libraries as JAR files: container-tags.jar, advanced-html-form-tags.jar, and basic-html-form-tags.jar. Which one techniques are appropriate for packaging the TLD files for these tag libraries?