Need to set the quartz cron expression dynamically

Question

I\'m using quartz in my web application (Servlet web app) following is snap of quartz.property file and the quartz.job.xml

quartz.property

#========         


        

Answer 1

CronTrigger cronTrigger = (CronTrigger) stdScheduler
                .getTrigger(triggerName,triggerGroupName);
CronTrigger newTriggerIns = new CronTrigger();
 newTriggerIns.setJobName(cronTrigger.getJobName());
 newTriggerIns.setName(triggerName);
 newTriggerIns.setCronExpression(newCronExpression);
 stdScheduler.rescheduleJob(triggerName,triggerGroupName,newTriggerIns);

In the above, take the existing trigger instance. Create one new trigger instance and set cron expression.

Then reschedule the existing instance with new one.

Answer 2

Use Quartz api. Programmatically take this trigger instance, cast it to CronTrigger instance and use it's setCronExpression to put expression dynamically.

Answer 3

Creating a new Trigger like this doesn't work.

CronTrigger cronTrigger = (CronTrigger) stdScheduler.getTrigger(triggerName,triggerGroupName);
CronTrigger newTriggerIns = new CronTrigger();
newTriggerIns.setJobName(cronTrigger.getJobName());
newTriggerIns.setName(triggerName);
newTriggerIns.setCronExpression(newCronExpression);
stdScheduler.rescheduleJob(triggerName,triggerGroupName,newTriggerIns); //doesn't work

You just have to edit the original trigger like this:

CronTrigger cronTrigger = (CronTrigger) stdScheduler.getTrigger(triggerName,triggerGroupName);
cronTrigger.setCronExpression(newCronExpression);
stdScheduler.rescheduleJob(triggerName,triggerGroupName,cronTrigger);