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2021 Dec 1Z0-868 test preparation

Q81. A retail company has a dashboard application that lets executive decision makers view current business information. This information includes gross sales, returned goods dollars, cost of labor, and other information. The information is updated on a continuous basis using a JMS queue. None of this information is critical, so the loss of a few messages is acceptable. Which JMS delivery mode meets these requirements and optimizes performance? 

A. best-effort 

B. at-most-once 

C. store-and-forward 

D. once-and-only-once 


Q82. A small company that sells avatar skins for virtual reality environments, has a static web site for advertising their wares. The web site was created by a talented graphic artist using a popular WYSIWYG (What You See Is What You Get) HTML editor and contains a great deal of JavaScript. The company wants to add server-side processing capabilities for the purpose of developing a shopping application. They are considering using JavaServer Faces (JSF). What is a potential disadvantage the JSF framework? 

A. The JavaScript will have to be rewritten to conform to JSF standards. 

B. JSF tags cannot be integrated into the HTML generated by WYSIWYG editors. 

C. The graphic artist cannot accurately preview the web pages offline with a generic WYSIWYG HTML editor. 

D. All the web pages will need to be converted into JSF before going into production, to keep the end users from losing a session context. 


Q83. A company has a legacy system that it is going to use Java EE technology to re-engineer. The legacy solution consists of active server pages and a relational database. The company is interested in changing DB vendors in the future and this requirement is key to moving forward. This is a web-based transactional sales system. The company will keep the relational database schema because it still meets business requirements and will not require re-engineering. What is the best solution? 

A. JSP, JDBC only 

B. JSP, servlets, JDBC only 

C. JSF, servlets, JPA, EJB3 

D. JSF, servlets, DAO, JDBC 


Q84. Your organization has an existing web-based Java e-commerce application that provides remote EJB interfaces. Your organization is interested in architecting a separate Java billing application that leverages some of the business logic contained in the e-commerce application. Which technology is ideal for this application? 



C. Java IDL 



Q85. Brokers at a firm currently use a two-tier application to execute stock transactions on behalf of their customers. Business components within the application enforce a number of complex business rules that ensure that stock transactions are executed properly. Management has decided that clients should be able to execute their own transactions to streamline operations. Management also wants clients to run the same existing two-tier application from their home computers. They have hired you to advise them on how to proceed to ensure that no illegal stock transactions are executed once the application is available directly to clients. Which two recommendations should you give to this brokerage firm? (Choose two.) 

A. The code already checks for correct execution so they can deliver the application to clients "as is." 

B. Checks for correctness should be rewritten as database constraints because the application running on the client might be modified. 

C. The application should be re-architected as a three-tier solution. That way, validation checks can be moved to a server-side business tier, which remains trustworthy. 

D. The application should be obfuscated before it is delivered to the client. That way, clients cannot modify it. Therefore, the validation checks currently implemented will remain trustworthy. 

Answer: B,C 

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Q86. A company architected and developed a Java EE application and now they are having problems with the scalability of the system. The application uses JSPs and servlets deployed to a web container, and stateless session beans and DAOs deployed to an EJB container. The application's non-functional requirement for scalability is to support 500 concurrent users during peak hours of operation. The application can currently support 500 concurrent users, but the response time is 200 percent of what it is acceptable. You have been hired as an architect and have been assigned to help resolve this problem. The company's management is concerned with the hardware budgeting. What initial advice would you give to the company? 

A. add another web server 

B. start a new project to re-architect the application 

C. monitor the application to determine the potential problem areas 

D. add more memory and processors to the hardware hosting the EJB container 


Q87. A company is considering re-architecting their application from a two-tier to a three-tier architecture. To see what impact the new architecture would have on their non-functional requirements (NFRs), they created a prototype. When they tested the prototype based on their three-tier architecture they noticed, contrary to expectations, that the prototype was less scalable than the original two-tier solution. Which two statements explain the result? (Choose two.) 

A. Clients end up competing for CPU cycles on the common business logic tier. 

B. Clients end up competing for resources on the back-end database used by the application. 

C. Clients did NOT share interest in any domain objects, but the business tier spent too much time coordinating among clients anyway. 

D. Clients did NOT share interest in any domain objects and the business tier ran out of memory to represent all domain objects required by the clients. 

Answer: A,D 

Q88. As the architect charged with refactoring an existing system, you have determined that the interactions between objects in the existing system are too complex and that the objects are tightly coupled. Furthermore, due to the coupling, additional functionality would require the modification of many objects in the system. Which pattern can fix this problem? 

A. Facade B. Mediator C. Template D. Prototype E. Command 

F. Abstraction 


Q89. A teenage fashion web site employs a dozen web designers skilled in graphic design, HTML, and some JavaScript experience. You were hired by the company to create an architecture that includes a small amount of dynamic content to integrate the web site with the company's order entry system. Which three web technologies would you train the web designers to use to create dynamic pages? (Choose three.) 

A. the servlet API 

B. JSP with standard tags 

C. JSP with JSTL database tags 

D. building new JSF components 

E. standard JSF component tags 

F. JSP with the Expression Language 

Answer: B,E,F 

Q90. A company has retained you to advise them on which standard methodology they should use when building their next-generation product suite using Java EE. 

The core requirements are as follows: 

The presentation tier must run inside a browser and deliver a compelling end-user experience. 

The business logic tier must support transactions. 

The persistence tier must be easy to develop, but not at the expense of runtime performance. 

The company is designing for the future, and wants to use the most future-proof approach possible. 

Which high-level solution most closely meets the stated requirements? 

A. JSPs using JSTL communicating with controllers / POJOs, with the persistence model implemented using JPA 

B. JSPs using scriptlets communicating with stateful session beans using controllers, with the persistence model implemented using JPA 

C. JSPs using JSTL communicating with stateless session beans using controllers, with the persistence model implemented using BMP entity beans 

D. JSPs using JSTL coupled with an Ajax-enabling JavaScript library communicating with stateless session beans using controllers, with the persistence model implemented using JPA