CronSequenceGenerator fails to accurately compute earliest next date when using second expression [SPR-9459]

[spring-projects-issues]

sebdotv opened SPR-9459 and commented

If using an expression containing seconds like "*/15 * 1-4 * * *", CronSequenceGenerator will compute the following next dates:

• from 01-june-2012 9:53:50 -> the next day at 1:00:00, which is correct
• from 01-june-2012 9:53:00 -> the next day at 1:00:15, which is not the earliest possible schedule (above)

Corresponding test case attached.

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Affects: 3.1.1

Attachments:

• CronSequenceGeneratorTest.java (1.10 kB)

Issue Links:

• Scheduled tasks seem to run twice [SPR-6859] #11525 Scheduled tasks seem to run twice
• CronSequenceGenerator.next() is not implemented as documented [SPR-14589] #19158 CronSequenceGenerator.next() is not implemented as documented

[spring-projects-issues]

Juergen Hoeller commented

I've refined CronSequenceGenerator's rounding up of seconds to address such second-specific cron expressions now, while retaining the desirable rounding-up behavior needed by other cases. To be released in 3.2.2.

Juergen