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Qustion No. 1
A developer examines a list of potential enterprise applications and selects the most appropriate technologies to use for each application.
For which two applications is EJB an appropriate solution? (Choose two.)
A. To render a GUI for mobile clients.
B. As a container for web-tier components including JSP.
C. As a Web service endpoint accessed by non-Java clients.
D. To receive and respond to HTTP Post requests directly from a web browser.
E. As an online shopping cart which can persist across multiple sessions with a single client.
Answer: CE
Qustion No. 2
Which two are true about the client view of a message-driven bean? (Choose two.)
A. References to message destinations can be infected.
B. References to message destinations cannot be looked up in the client's JNDI namespace.
C. Clients of a message destination need to know that the destination is listened to by a pool of message consumers,
D. Clients of a message destination do NOT need to know that the destination is listened to by a message-driven bean.
Answer: BC
Explanation: Client components do not locate message-driven beans and invoke methods directly on them. Instead, a client accesses a message-driven bean through, for example, JMS by sending messages to the message destination for which the message-driven bean class is the MessageListener.
Reference: The Java EE 6 Tutorial, What is a Message-Driven Bean?
Qustion No. 3
Which is a valid use of the EJB 3.x TimerHandle object?
A. To retrieve all active timers associated with this bean
B. To adapt EJB 3.x timers to EJB 2.1 and earlier timers
C. To obtain a seralizable timer handle that may be persisted
D. To be implemented by EJB classes that are to be registered with the timer service
Answer: C
Explanation: The TimerHandle interface allows the bean provider to obtain a serializable timer handle that may be persisted.
Since timers are local objects, a timer handle must not be passed through a bean's remote business interface, remote interface or web service interface.
Reference: javax.ejb, Interface TimerHandle
Qustion No. 4
A developer writes a stateless session bean with one local business interface and with container-managed transactions. All business methods have transaction attribute REQUIRED. The bean has an injected field sessionCtx of the type SessionContext. Which two operations are allowed in a business method of the bean? (Choose two.)
A. sessionCtx. getEJBObject
B. sessionCtx.setRollbackOnly
C. sessionCtx. getMessageContext
D. sessionCtx. getBusinessObject
E. sessionCtx. getEJBLocalObject
Answer: BD
Qustion No. 5
Suppose a developer wants to create an automatic persistent timer that performs data validation every hour. Given the following stateless session bean:
@Stateless
Public class OrderVerificationBean
Private void verificationExternalOrders () {
/ / do something
}
What is the minimum modification you would need to make to the bean to create the automatic persistent timer?
A. Modify the verifyExternalOrders methos to look like this: @Schedule private void verifyExternalOrders () / do something
B. Modify the verifyExternalOrders method to look like this:
@Schedule (hour = “*”)
private void verifyExternalOrders ()
/ / do something
C. Modify the verifyExternalOrders method to look like this:
@Schedule (persistent = true)
private void verifyExceptionalOrders ()
/ / do something
D. Modify the verifyExternalOrders method to look like this:
@Schedule (hour = “*”, persistent = true)
private void verifyExceptionalOrders ()
/ / do something
Answer: B
Explanation:
Not D: Timers are persistent by default. If the server is shut down or crashes, persistent timers are saved and will become active again when the server is restarted. If a persistent timer expires while the server is down, the container will call the @Timeout method when the server is restarted.
Nonpersistent programmatic timers are created by calling TimerConfig.setPersistent(false) and passing the TimerConfig object to one of the timer-creation methods.
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