Quartz Cron Expression for Hours 3, 9, 15, 21

1
votes

I'm using the Quartz Grails Plugin and I need to schedule a job that runs at 3am, 9am, 3pm, 9pm every day. This seems like a valid cron expression:

* 3,9,15,21 * * *

But Quartz doesn't support that. Is what I need to do possible?

1
grailscronquartz-schedulercronexpression

1 Answers

0
votes

In Quartz, there is an additional position to the expression. The first one represents seconds, not minutes, as it is for unix-style cron expressions. The other issue is with quartz support for specifying day-of-week and day-of-month:

Support for specifying both a day-of-week and a day-of-month value is not complete (you must currently use the '?' character in one of these fields).

This should work:

* * 3,9,15,21 * * ?

Take a look at this guide and the Quartz grails docs for more details.