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Question 31

Given:

You are creating an Alarm management system. When you create a new alarm, you want it to create an alert that is triggered once at the specified time.

Which method should you call on Line 9 to create the timer?

timerService.createCalendarTimer(alarmDate, config);

timerService.createSingleActionTimer(alarmDate, config);

timerService.createIntervalTimer(alarmDate, -l, config);

timerService.createTimer(alarmDate, -l, config);

Correct Answer: B

To create a timer that triggers once at a specified time, you should use the method that allows for a single-action timer. The correct method to use is TimerService.createSingleActionTimer(Date expiration, TimerConfig config). This method schedules a timer to expire at the given date and does not repeat. Hence, the appropriate method to call on Line 9 is "timerService.createSingleActionTimer(alarmDate, config);"

Discussion

kozionovOption: B

B https://docs.oracle.com/javaee/7/api/javax/ejb/TimerService.html#method.detail

orjavaOption: B

Answser B. TimerService.createTimer(Date initialExpiration, long intervalDuration, Serializable info) IllegalArgumentException - If initialExpiration is null, if initialExpiration.getTime() is negative, or if intervalDuration is negative.