Oracle 1Z0-807 Online Practice Questions and Exam Preparation

Oracle 1Z0-807 Online Questions & Answers

• Question 11:

  A company has been soiling a desktop based billing application that has Character User Interface (CUI) application developed by using Java. The company would like to release the next version of this application with the following features: a GUI with a pluggable look- and-feel capability and the flexibility to support multiple database vendors.

  Which two technologies would you use in the new version?

  A. Swing
  B. JDBC
  C. JPA
  D. CMP
  E. AWT
  A. Swing
  B. JDBC

• Question 12:

  Your company requires all its developers to use a well-specified set of exception classes to model several common error conditions, many of the which are specific to its business. These exception classes are centrally maintained and come packaged in a library (a JAR file). The application you are developing needs to report a number of error conditions covered by this library to remote clients.

  Which paring of component type and remote access technology enables client applications to use the predefined exceptions as part of their natural programming model?

  A. Servlet accessed using HTTP
  B. Entity bean accessed using web services
  C. Stateless session bean accessed using Remote Method Invocation (RMI)
  D. Message-driven bean accessed using Java Message Service (JMS) queue
  C. Stateless session bean accessed using Remote Method Invocation (RMI)

• Question 13:

  Your application uses web services extensively and frequently to distribute large XML objects over HTTP. In addition, the application has been set particularly demanding performance and scalability service level agreements (SLAs). Which java API is best suited for your application?

  A. STAX
  B. DOM
  C. JAXB
  D. JAXR
  A. STAX

• Question 14:

  You have been recruited by an online retailer of footwear to conduct a review of their online systems. Your primary Finding is that the development team has implemented duplicated complex business logic as Java scripts directly into the JSPs, causing performance, scalability, and maintainability issues.

  Which two design patterns would you select to improve the current code base?

  A. View Helper
  B. From Controller
  C. Composite View
  D. Service-to-Worker
  E. Business Delegate
  B. From Controller
  D. Service-to-Worker

• Question 15:

  You are contracted to improve the performance of an application.

  While analyzing the application, you observe the following issues: Tight coupling between client and business objects

  

  Too many remote method Invocations between client and server

  

  Which design pattern is best suited to improving performance?

  A. Web Service Broker
  B. Value List Handler
  C. Data Access Object
  D. Service Activator
  B. Value List Handler

• Question 16:

  Your company is creating a Java EE corporate wide workflow system in winch significant internal business events are consumed by multiple applications. Due to multi-year development plans, many of these applications do not exist yet, even at the design stage. IT has defined standard data formats for these events in the form of small XML documents. Also, the rules for how an application filters and processes events are not fixed In advance and can change over the life or the application.

  Which combination of technologies is best for distributing and consuming these events throughout the company?

  A. Relational database and JDBC
  B. HTTP client library and servlets
  C. Remote Method Invocation (RMI) and stateless session beans
  D. Java Message Service (JMS) topics and message-driven beans
  E. JMS queues and message-driven beans
  D. Java Message Service (JMS) topics and message-driven beans

• Question 17:

  Which three principles are best practices when implementing a logging strategy for an enterprise application?

  A. Never print log messages to the console window.
  B. Use the appropriate logger level for logging information.
  C. Log messages for every method entry and exit.
  D. Include programmer-specific data in the log messages.
  E. Include the thread name and Java class name in log messages.
  B. Use the appropriate logger level for logging information.
  C. Log messages for every method entry and exit.
  D. Include programmer-specific data in the log messages.

• Question 18:

  Which three actions represent best practices when implementing an exception handling strategy for an application?

  A. Create a custom checked exception if an alternative action can be taken to resolve the exception.
  B. Create a custom unchecked exception if the action to resolve the exception cannot be defined.
  C. Always log the specific exception before re-throwing a wrapped exception.
  D. Always throw exceptions in methods that are designed for exception handling.
  E. Always include information specific to the error when logging an exception.
  A. Create a custom checked exception if an alternative action can be taken to resolve the exception.
  B. Create a custom unchecked exception if the action to resolve the exception cannot be defined.
  E. Always include information specific to the error when logging an exception.

• Question 19:

  You are the architect for XYZ bank. XYZ is redesigning their online banking offering and you need to ensure that the new design follows security best practices for the JEE platform. Select three security best practices for JEE applications.

  A. Schedule regular penetration testing.
  B. Log all security related application events.
  C. Implement an exception-handling strategy.
  D. Encrypt data, both on the wire and at rest.
  E. Use both programmatic and declarative security.
  F. Treat users as untrusted even when authenticated.
  B. Log all security related application events.
  C. Implement an exception-handling strategy.
  E. Use both programmatic and declarative security.

• Question 20:

  A company is extending is successful social networking site to support the following channels:

  instant messaging (IM), email messaging and text messaging/SMS. At present, the site has scaled 400% in one year using a standard MVC Web framework the application experiences large surges or spikes in demand and also periods of

  inactivity. Notification delivery to the three channels does not need to be guaranteed.

  Which solutions extends the current architecture and best meets the company's requirements?

  A. Send the notification inline, that is, within the normal HTTP request-response cycle.
  B. Place messaging on a Java messaging Service (JMS) queue and use message-driven beans (MDBs) to create and send notifications.
  C. Insert the messages into a database and use plain old Java Objects (POJOs) to read the messaging using JDBC and send notifications.
  D. Insert the messages into a database and use entity beans to read the messages using JDBC and send notifications.
  B. Place messaging on a Java messaging Service (JMS) queue and use message-driven beans (MDBs) to create and send notifications.