I want to execute quartz scheduler every 2, 3, 4 ... etc day from today or user selected date. could anyone help me, what would be the cron expression for above requirement ?
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Really. The [format for cron expressions](http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/crontrigger.html#format) is very well documented. There are also tons of tutorials, examples, and documentations in the web. Why not simply look them up? – Seelenvirtuose Jan 30 '19 at 07:55
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Thanks for your response but i visited lots of tutorials but did not find appropriate solution – prakash sharma Jan 30 '19 at 08:02
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@Seelenvirtuose you're wrong. read the question more thoroughly. The **from today or user selected date**-part is pretty tricky (unsolvable?). – user871611 Jan 30 '19 at 08:12
3 Answers
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cron doesn't support scheduling "from today". It designed to survive restart so all schedules must be absolute.
talex
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your answer seems very logical. I tried to google it up, but couldn't find anything (official) on this topic. Could you maybe provide a link? – user871611 Jan 30 '19 at 08:22
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it triggers at 12 every third day..
0 0 12 1/3 * ? *
The next 5 schedules are :
- Thursday, January 31, 2019 12:00 PM
- Friday, February 1, 2019 12:00 PM
- Monday, February 4, 2019 12:00 PM
- Thursday, February 7, 2019 12:00 PM
- Sunday, February 10, 2019 12:00 PM
Khalid Shah
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Thanks @Khalid this (0 0 12 1/3 * ? *) expression start executing from first day of month but i want expression like every 3rd day from today. ex if from date today then first 12 am 30/01/19, 12 am 02/02/19 etc – prakash sharma Jan 30 '19 at 08:07
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The expression is missing the **from today or user selected date**-part. – user871611 Jan 30 '19 at 08:08
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So we can not achieve above requirement from quartz scheduler correct ? – prakash sharma Jan 30 '19 at 08:10
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Would this be what you're looking for:
CronScheduleBuilder scheduleBuilder = CronScheduleBuilder
.cronSchedule(job.getCronExpression());
CronTrigger trigger = newTrigger()
.withIdentity(job.getTriggerName(),job.getTriggerGroup())
.startAt(job.getStartDate())
.withSchedule(scheduleBuilder).build();
scheduler.scheduleJob(jobDetail, trigger);
Hope that helps!
hd1
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This only solves the start date issue. As @talex mentioned in his answer (correct me if I'm wrong in your setup), cron doesn't support *from day x*. – user871611 Jan 30 '19 at 14:06
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Put it in a thread and [trigger it daily](https://stackoverflow.com/questions/20387881/how-to-run-certain-task-every-day-at-a-particular-time-using-scheduledexecutorse) and put a non-repeating job in on the thread? – hd1 Jan 31 '19 at 01:42