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javacronquartz-scheduler

Java Quartz - cron expression

I have a report creator program made in Java that needs to run every Monday and I used Quartz for my scheduling part. The trick is, the amount of reports needed to be generated varies; depending if the Monday is the first of the month, or the succeeding Mondays.

To achieve this, what i did is create a trigger for each Monday of the month with the first Monday pointing to a specific job class while the rest of the Mondays(triggers) point to another job class.

        .withIdentity("trigger1", "group1")
        .withSchedule(cronSchedule("0 1 0 ? 1/1 MON#1 *"))
        .build();

        .withIdentity("trigger2", "group1")
        .withSchedule(cronSchedule("0 1 0 ? 1/1 MON#2 *"))
        .build();

and so on until i reach

        .withIdentity("trigger5", "group1")
        .withSchedule(cronSchedule("0 1 0 ? 1/1 MON#5 *"))
        .build();

It reached MON#5 because there could be 5 Mondays in a month; like this October. This is fine, it works (I think), but my question is this. Is there a way to combine my cron schedule so that I will only need one trigger for the succeeding mondays? Something like;

        .withSchedule(cronSchedule("0 1 0 ? 1/1 MON#2,MON#3,MON#4,MON#5 *"))

If there is, please kindly enlighten me. If I'm just missing something, something in my programming, or if there exists an unknown page in the labyrinth which is the web that leads me to the truth, then kindly point me to the right direction.

Your kind words are greatly appreciated. Thanks

p.s: I included a cron tag even though it says it's for UNIX computers. I believe there is little or no difference between Quartz cron and Unix cron. If there is, then please do tell.

Solution

  • It looks like there is no formal solution for your problem.

    Here is a quote from Quartz 2.0 documentation:

    The '#' character is allowed for the day-of-week field. This character is used to specify "the nth" XXX day of the month. For example, the value of "6#3" in the day-of-week field means the third Friday of the month (day 6 = Friday and "#3" = the 3rd one in the month). Other examples: "2#1" = the first Monday of the month and "4#5" = the fifth Wednesday of the month. Note that if you specify "#5" and there is not 5 of the given day-of-week in the month, then no firing will occur that month. If the '#' character is used, there can only be one expression in the day-of-week field ("3#1,6#3" is not valid, since there are two expressions).

    There is also an open bug on this.