Interview Questions.

Question 1. What Are The Three Key Components To Consider When Using Java Quartz?

Answer :

The scheduler, activity and trigger. The scheduler coordinates the execution of the job and the trigger sets up the c program languageperiod and frequency with which the process will run.

Question 2. How Do You Begin A Quartz Process So That It Will Start Executing Jobs?

Answer :

To begin a quartz procedure you must provoke all of the components, scheduler, activity and trigger, and then name the begin technique at the scheduler.

Trigger cause = TriggerBuilder.NewTrigger().WithIdentity("jcgTriggerName", "group1")
  .WithSchedule(CronScheduleBuilder.CronSchedule("0/five * * * * ?")).Build();
Scheduler scheduler;
scheduler = new StdSchedulerFactory().GetScheduler();
scheduler.Start();
JobKey jobKey = new JobKey("jcgJobName", "group1");
JobDetail activity = JobBuilder.NewJob(MyJob.Magnificence).WithIdentity(jobKey).Construct();
scheduler.ScheduleJob(task, cause);
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Question three. How Do I Check The Status Of A Running Job?

Answer :

The JobListener will permit you to take a look at the reputation of a running process.

JcgScheduler.GetListenerManager().AddJobListener(jcgJobListener, KeyMatcher.JobKeyEquals(new JobKey("jcgJobName", "jcgJobGroup")));
Question 4. How Is The Simpletrigger Used?

Answer :

A SimpleTrigger is used for a unmarried execution or an execution that repeated a selected wide variety of instances over a given c programming language.

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Question 5. How Do I Customize Thread Management?

Answer :

I set the thread pool elegance and corresponding thread pool homes that fall below org.Quartz.ThreadPool. The default thread pool is org.Quartz.Simpl.SimpleThreadPool.

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Question 6. How Is The Crontrigger Used?

Answer :

The CronTrigger is used to execute a process the use of a cron expression. A cron expression is a notation that represents a 2nd, minute, hour, day, month, or year in addition to the approaches to explicit unique characters like wildcards or tiers for the schedule.

Question 7. How Do You Store Job State?

Answer :

The JobDataMap is used to keep nation as a way to be provided to the process when it executes.

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Question 8. How Do You Handle Or Prevent Concurrent Execution Of Jobs?

Answer :

The DisallowConcurrentExecution annotation is used to prevent concurrent execution of that identical instance of jobs. The instance definition is controlled by the identifier in JobDetail.

Question 9. How Do You Update The Jobdatamap Between Execution Of Jobs?

Answer :

Use the PersistJobDataAfterExecution annotation to update the statistics in JobDataMap after the process executes efficiently.

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Question 10. What Types Of Exceptions Are Allowed From The Job Execute Method?

Answer :

The JobExecutionException is the most effective allowable exception from the process execute approach

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Question 11. What Happens When A Scheduled Job Fails To Trigger?

Answer :

The misfire situations is particular to every trigger. For the cron cause, a misfire situation is particular inside the process creation or will default to the clever coverage. To personalize the misfire situation precise to the cron cause there are 3 alternatives; withMisfireHandlingInstructionDoNothing, withMisfireHandlingInstructionFireAndProceed, withMisfireHandlingInstructionIgnoreMisfires.

You also can create a custom trigger by way of enforcing the TriggerListener interface and define the triggerMisfired technique.

1  public void triggerMisfired(Trigger trigger);

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Question 12. What Are Job Stores?

Answer :

Job stores manipulate how information is supplied to the scheduler, jobs, and triggers.

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Question 13. What Are Different Types Of Job Stores?

Answer :

There are three one-of-a-kind varieties of process shops provided through quartz; RAMJobStore, JDBCJobStore and TerracottaJobStore that furnished persistent process facts to quartz additives.

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Question 14. How Would You Stop A Running Job?

Answer :

You can stop a running job with the aid of calling interrupt on the scheduler and supplying the activity key. The activity which you are interrupting must enforce the InterruptableJob interface.

Sched.Interrupt(process.GetKey());
Question 15. What Is The Jobexecutioncontext?

Answer :

The JobExecutionContext is passed to the execute technique of an invoked task with the aid of the scheduler and it consists of a handle to the scheduler, a manage to the trigger and the JobDetail.

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Question sixteen. Name A Few Of The Bundled Jobs That Quartz Provides?

Answer :

A few of the roles that quartz provides for customers are FileScanJob, DirectoryScanJob, NativeJob, EJB3InvokerJob, SendQueueMessageJob, SendTopicMessageJob, JmxInvokerJob and SendMailJob. Documentation on these jobs exists in the JavaDoc for the quartz-jobs-*.Jar.