Quartz Scheduler - How to get cron expression given job name and group name?

Posted on 2010-09-03
Last Modified: 2012-06-27

I'm using Quartz Scheduler v.1.8.0.

How do I get the cron expression which was assigned/attached to a Job and scheduled using CronTrigger?  I have the job name and group name in this case.  Though many Triggers can point to the same Job, in my case it is only one.

There is a method available in Scheduler class, Scheduler.getTriggersOfJob(jobName, groupName), but it returns only Trigger array.

NOTE: Class CronTrigger extends Trigger
Question by:Zoniac
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Accepted Solution

gremwell earned 100 total points
ID: 33602377
If there only one trigger per job, I would expect the array returned by getTriggersOfJob() contain one entry only. You can probably cast it (the first element of the array, not the array itself) to CronTrigger and invoke CronTrigger's getCronExpression() method.

Author Comment

ID: 33602559
> I would expect the array returned by getTriggersOfJob() contain one entry only

Yes, you're right.  In my case, it is only one trigger per job.

Author Comment

ID: 33602565
> You can probably cast it (the first element of the array, not the array  itself) to CronTrigger and invoke CronTrigger's getCronExpression()  method.

Yes, it works.

Code example shown below:

Trigger[] triggers = scheduler.getTriggersOfJob(jobName, groupName);
for (Trigger trigger : triggers) {
    if (trigger instanceof CronTrigger) {
        CronTrigger cronTrigger = (CronTrigger) trigger;
        String cronExpr = cronTrigger.getCronExpression();

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Author Closing Comment

ID: 33602631
Solution arrived.

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