Java SCWCD Online Test 2024, Java SCWCD Question Answers

You have a use case in your web application that adds several session-scoped attributes. At the end of the use case, one of these objects, the manager attribute, is removed and then it needs to decide which of the other session-scoped attributes to remove. How can this goal be accomplished?

Every page of your web site must include a common set of navigation menus at the top of the page. This menu is static HTML and changes frequently, so you have decided to use JSP’s static import mechanism. Which JSP code snippet accomplishes this goal?

You are building a Front Controller using a JSP page and you need to determine if the user’s session has NOT been created yet and perform some special processing for this case. Which scriptlet code snippet will perform this test?

For an HttpServletResponse response, which one create a custom header?

A JSP page needs to set the property of a given JavaBean to a value that is calculated with the JSP page. Which one jsp:setProperty attributes must be used to perform this initialization?

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 by the servlet to the JSP; furthermore, that JSP uses a custom tag and must also process this information. This information must NOT be accessible to any other servlet, JSP or session in the webapp. How can you accomplish this goal?

A developer is designing a web application that makes many fine-grained remote data requests for each client request. During testing, the developer discovers that the volume of remote requests significantly degrades performance of the application. Which design pattern provides a solution for this problem?

You are designing an n-tier Java EE application. You have already decided that some of your JSPs will need to get data from a Customer entity bean. You are trying to decide whether to use a Customer stub object or a Transfer Object. Which one statements are true?

You need to create a servlet filter that stores all request headers to a database for all requests to the web application’s home page “/index.jsp”. Which HttpServletRequest method allows you to retrieve all of the request headers?

A JSP page needs to instantiate a JavaBean to be used by only that page. Which one jsp:useBean attributes must be used to access this attribute in the JSP page?

Your web application requires the ability to load and remove web files dynamically to the web container’s file system. Which one HTTP methods are used to perform these actions?

You want to create a filter for your web application and your filter will implement javax.servlet.Filter. Which one statements are true?

You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client’s license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter. Which code snippet will accomplish this goal?

You are creating a new JSP page and you need to execute some code that acts when the page is first executed, but only once. Which one are possible mechanisms for performing this initialization code?

In an n-tier application, which two invocations are typically remote, not local?

A developer is designing the presentation tier for a web application which requires a centralized request handling to complete common processing required by each request. Which design pattern provides a solution to this problem?

The tl:taskList and tl:task tags output a set of tasks to the response and are used as
follows:
11. <tl:taskList>
12. <tl:task name=”Mow the lawn” />
13. <tl:task name=”Feed the dog” />
14. <tl:task name=”Do the laundry” />
15. </tl:taskList>
The tl:task tag supplies information about a single task while the tl:taskList tag does
the final output. The tag handler for tl:taskList is TaskListTag. The tag handler for
tl:task is TaskTag. Both tag handlers extend BodyTagSupport. Which allows the
tl:taskList tag to get the task names from its nested tl:task children?

Assume the tag handler for a st:simple tag extends SimpleTagSupport. In what way can scriptlet code be used in the body of st:simple?

Given: 11. <% java.util.Map map = new java.util.HashMap(); 12. request.setAttribute(“map”, map); 13. map.put(“a”, “b”); 14. map.put(“b”, “c”); 15. map.put(“c”, “d”); %> 16. <%– insert code here –%> Which one EL expressions, inserted at line 16, are valid and evaluate to “d”?

Which one is valid value for the <transport-guarantee> element inside a <securityconstraint> element of a web application deployment descriptor?