Oracle 1Z0-807 Online Practice Questions and Exam Preparation

Oracle 1Z0-807 Online Questions & Answers

• Question 81:

  Which option describes the design relationship between session beans and entity beans?

  A. Aggregation
  B. Separation of concerns
  C. Common reuse principle
  D. Liskov substitution principle
  E. Interface segregation principle
  B. Separation of concerns

• Question 82:

  Your application produces messages by client applications. The number of clients interested in the messages varies continuously at run time. Any client can process any message, but a message must be processed exactly once. How should the messages be delivered to the clients?

  A. Using a Java Message Service (JMS) topic
  B. Using a Java Message Service (JMS) queue
  C. Using XML over HTTP
  D. Using a Simple Object Access Protocol (SOAP) web service
  B. Using a Java Message Service (JMS) queue

• Question 83:

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

• Question 84:

  Which two statements are true about the timer service of a business component container?

  A. Timed notifications for all types of session beans can be scheduled by using this service.
  B. When the server is shut down, the timer is persisted automatically and becomes active again when the server is restarted.
  C. Each instance of message driven beans has unique timers.
  D. When stateful session bean instance is removed, the container detaches the timers associated with the instance and allocates them to the new instance.
  E. When a transaction is rolled hark, the timer creation within the transaction is also rolled back.
  B. When the server is shut down, the timer is persisted automatically and becomes active again when the server is restarted.
  E. When a transaction is rolled hark, the timer creation within the transaction is also rolled back.

• Question 85:

  Which statements are true about Java integration technologies?

  A. Remote Method Invocation (RMI) helps to connect subsystems in a loosely coupled manner.
  B. Java Message Service (JMS) helps in synchronous messaging between Java and non-Java systems.
  C. JMS helps to broadcast messages to multiple Java-based receivers.
  D. Java Connector Architecture (JCA) helps to integrate with heterogeneous legacy enterprise information systems.
  C. JMS helps to broadcast messages to multiple Java-based receivers.

• Question 86:

  Which type of application would benefit from using the Singleton pattern?

  A. An application that interacts with external systems in serial fashion.
  B. An application that interacts with external systems in parallel fashion.
  C. A clustered application that can support 200 concurrent users.
  D. An application that requires remote monitoring capabilities
  A. An application that interacts with external systems in serial fashion.

• Question 87:

  Your company has been using the ACME database vendor for many years. Recently, it started considering a migration to the XYZ database vendor, who uses different SQL dialed. The SQL engines in ACME and XYZ have significant differences in performance when executing the same SQL queries?

  Which is the best persistence technology for database migration?

  A. JPA
  B. JDBC
  C. CMP entity bean
  D. JDBC row set XML serialization
  A. JPA

• Question 88:

  Which statement is true about the use of security-related annotations in an enterprise bean?

  A. They can be used to specify permissions only on business methods.
  B. They can be used to specify permissions on a class or its business methods.
  C. They can be used to change an authentication mechanism.
  D. They can be used to acquire a secure connection using SSL.
  E. They can be inherited from a parent abstract class.
  B. They can be used to specify permissions on a class or its business methods.

• Question 89:

  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.
  A. The storage mechanism implemented in CommentManager must be private to CommentManager.
  C. The comments must be assessable directly only within CommentManager.

• Question 90:

  A company provides call center support for corporations world-wide. Each agent in the call center can be assigned to multiple call center customers. All the company's customers use Windows based user interfaces and it has Just signed a new customer that uses a Java EE back end and wants a rich interface.

  The company is developing a user interface for the new customer with the following requirements: Customer service representatives (CSRs) must be able to work with minimal training on the application.

  

  CSRs must be able to switch between call center systems quickly.

  

  Screens must have a windows look and feel.

  

  2000 agents spread across four locations must be able to use the system.

  

  Which recommendation would you make to this company about the user interface (UI)?

  A. Write the UI using JSP and JSTL.
  B. Write the UI using JSPs with embedded script lets.
  C. Write the UI using AJAX, Accessing servlets directly.
  D. Write the UI using Java Swing and describe using JNLP.
  D. Write the UI using Java Swing and describe using JNLP.