1Z0-807 Online Practice Questions and Answers

You are the architect of an existing project. Making changes to one component frequently requires making changes to many other components. Which action would reduce future maintenance costs?

A. Redesign the configuration and deployment.

B. Add an abstraction layer between the servlets and the EJB components.

C. Convert all stateful EJB components to stateless EJB components.

D. Expose the existing EJB components as web services.

A travel company re-architects its application from a two-tier to a three-tier architecture. To see what impact the new architecture has on its non-functional requirements (NFR), the company intends to build a prototype based on the new architecture.

The company compares the NFR metrics associated with the new prototype against the metrics from their original two-tier solution.

Which option is an advantage of the original two-tier solution?

A. It has better availability because it has fewer single points of failure.

B. It has better manageability because each client has its own copy of the application. 100% Real QandAs | 100% Real Pass

C. It has better performance because each client must use its own set of domain objects.

D. It has better scalability because each client can access the database independently of other clients.

Which three web applications work best when they are designed to be server-push enabled?

A. A news feed used for providing users with frequently updated news content

B. A web chat that allows users to communicate using easily accessible web interfaces

C. A live sporting event application, used to deliver current results during matches

D. An auction system that provides users with live online bidding

E. A graphics rendering application that generates visuals in an orderly fashion

An online library wants to introduce a feature where an email notification is generated whenever a book becomes available for circulation. This notification must be sent to only those members who have expressed interest in that book.

Which design pattern would you use to implement this requirement?

A. Observer

B. Payload Extractor

C. Asynchronous Resource Integrator

D. Web Service Broker

E. Service Starter

You are designing a new subsystem to store and scratch for user commands in a fashion company's website. On class, CommentManager, is responsible for accessing comment data and providing read-only access to other objects in the subsystem.

Which two implementation details are necessary for the Cementmanager class?

A. The storage mechanism implemented in CommentManager must be private to CommentManager.

B. All the accessor and mutator methods in CommentManager must have the static modifier in their declarations.

C. The comments must be assessable directly only within CommentManager.

D. CommentManager should be a singleton object.

Which two statements apply to unsigned applets?

A. They can access the client file system.

B. They can connect to third-party servers.

C. They can connect to the originating host.

D. They can invoke public methods of applets on a page.

E. They can load native libraries.

A company wants to design an internal website for the purpose of managing its numerous social events. The site will not have heavy traffic, but will require state to be persisted in a database. You have been tasked to complete this action item in your spare time.

Which two Java EE-based approaches are best suited for quick development?

A. Use JPA in the web tier only.

B. Use message-driven beans to manage the posting of events.

C. Use your domain model components as JavaServer Faces (JSF) managed beans.

D. Use an Enterprise javaBeans (EJB) container to service-inject the domain model and support a JPA deployment.

Your company is considering migrating a persistence module, originally implemented as CMP entity beans, to now use JPA.

Which two statements are true?

A. Each CMP entity bean can be mapped to a single JPA entity class.

B. The client code that accesses the CMP entity beans does not have to change.

C. IPA cannot capture all the kinds of relationships supported by CMP entity beans.

D. The resulting IPA persistence module can be used on both the client and the server.

E. The JNDI name of a JPA entity class can be customized to match that of the corresponding CMP entity bean.

F. Remote clients of the CMP entity beans must start using web services to access the JPA entity classes on the server.

Your web page design company is designing websites for all the stores in a local mall. Your company must create a consistent "look and fool" for these sites.

After this "look and feel- project has gone through demonstration, enhancement and approval iterations with the mall's .lions, you job is complete and the development of the actual B2C (Business to-Client) system will be handled by a different firm

Which architecture is most appropriate for your prototype project?

A. Two tier, web-centric

B. Three, web-centric

C. Three-tier, enterprise-centric

D. Three-tier, application-centric

ABC Travel offers a night reservation service, exposed as a web service. XYZ Stays offers a hotel reservation service, also exposed as a web service. ABC and XYZ will not change their web service. A startup company has contacted you for

advice about designing a new service that combines flight and hotel reservations, which they will offer as a web service.

The startup company plans to provide their service by implementing a portable Java EE solution that aggregates the two services offered by ABC Travel and XYZ Stays, a combined reservation succeeded.

Only if both the flight reservation and the hotel reservation succeed

Which is the most effective way to meet the business requirement?

A. The startup company should implement their new service as a web service that uses an XA transaction manager.

B. The startup company cannot implement their new service as a web service, but must use an enterprise JavaBean (EJB) component to gain transaction propagation.

C. The startup company should implement their new service as a web service by calling the two existing services, and implementing their own compensating transaction.

D. The startup company can implement their new service as a web service by calling the two existing services in a single transaction, relying on transaction propagation to support this business rule.