Small project to show how one job can have multiple triggers that fire at different moments.

Originally, this repo was created to support this StackOverflow question. That issue was resolved by correcting the Liquibase change log. After that, the code here is still useful, as an example on using Quartz scheduler.

To initialize the database, run gradlew -PappArgs="['init']" bootRun. This will load the Quartz database schema in the database jdbc:mariadb://localhost:3306/qrtz, with the user name qrtz and the password qrtz. Edit application.properties if you want to use something different. Next, it creates a Quartz job named ExampleJob in the group ExampleGroup.

To run the job twice, with delays of 5 and 10 seconds, run gradlew bootRun. This is the way the jobs are scheduled:

schedule(UUID.randomUUID(), Date.from(ZonedDateTime.now().plusSeconds(5).toInstant()));
schedule(UUID.randomUUID(), Date.from(ZonedDateTime.now().plusSeconds(10).toInstant()));

The schedule method is implemented as follows:

private void schedule(UUID userId, Date date) throws SchedulerException
{
	logger.info("Scheduling job {} in group {} at {}", JOB_NAME, GROUP_NAME, date);
	
	JobDetail job = scheduler.getJobDetail(JobKey.jobKey(JOB_NAME, GROUP_NAME));
	TriggerKey triggerKey = TriggerKey.triggerKey(TRIGGER_NAME + "_" + userId, GROUP_NAME.toString());
	Trigger trigger = newTrigger()
			.forJob(job)
			.withIdentity(triggerKey)
			.usingJobData(new JobDataMap(Collections.singletonMap(ExampleJob.USER_ID_KEY, userId.toString())))
			.startAt(date)
			.withSchedule(simpleSchedule().withMisfireHandlingInstructionFireNow())
			.build();
	scheduler.scheduleJob(trigger);
}

Hope it's somehow useful.