Java Quartz Interview Questions And Answers
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.