A developer wants to create an enterprise bean that uses the EJB Timer service. Which two are true? (Choose two.)

The correct answer is B. The bean can be used within a transaction. C. Once created, the timer will survive a container crash. B: An enterprise bean usually creates a timer within a transaction. If this transaction is rolled back, the timer creation also is rolled back. Similarly, if a bean cancels a timer within a transaction that gets rolled back, the timer cancellation is rolled back. C: Timers are…

Timer Service

Question

A developer wants to create an enterprise bean that uses the EJB Timer service. Which two are true? (Choose two.)

Options

AOnce created, a timer cannot be canceled.
BThe bean can be used within a transaction.
COnce created, the timer will survive a container crash.
DThe enterprise bean must implement the TimedObject interface.
EThe developer can use either a message-driven bean, stateless session bean, or stateful session bean.

How the community answered

(18 responses)

A
6% (1)
B
83% (15)
E
11% (2)

Explanation

B: An enterprise bean usually creates a timer within a transaction. If this transaction is rolled back, the timer creation also is rolled back. Similarly, if a bean cancels a timer within a transaction that gets rolled back, the timer cancellation is rolled back. C: 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 The Java EE 6Tutorial. PartNo: 821?Transactions andTimers

Topics

#EJB Timer service#persistent timer#TimedObject interface#transaction support

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