Cron triggers

Fire every five minutes. It should fire on 0, 5, 10 ... 55 minute mark
"0 0/5 * * * ?"

Fire every hour
"0 0 * * * ?"

Fire every 2 hours. It should fire on the hours 0, 2, 4 ... 22
"0 0 0/2 * * ?"

Fire every 10 minutes. It should fire on the minutes 0, 10, 20 ... 50
"20 0/10 * * * ?"

Fire every half an hour between 8AM AM to 12PM
"0 0/30 8-12 * * ?"

Fire every tuesday at 12:15pm
"0 15 12 ? * TUE"

Fire everyday at 1:30am
"0 30 1 ? * MON-SUN"

Quartz

Example of creating multiple triggers for the same job. Plus example of job that just to run once

Maven Dependency

 <dependency>
  <groupId>org.quartz-scheduler</groupId>
  <artifactId>quartz</artifactId>
  <version>2.2.2</version>
 </dependency>

The Alarm job

package as.moes.job;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

import java.text.SimpleDateFormat;
import java.util.Date;

public class AlarmJob implements Job {

    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {

        if (null != jobExecutionContext.getNextFireTime())
            System.out.println("Trigger key..:" + jobExecutionContext.getTrigger().getKey().getName() + " "
                    + sdf.format(new Date()) + " "
                    + sdf.format(jobExecutionContext.getNextFireTime()) + " "
            );
        else
            System.out.println("Trigger key..:" + jobExecutionContext.getTrigger().getKey().getName() + " "
                    + sdf.format(new Date()) + " "
                    + "null "
            );

    }
}

The setup

    public static void setupAlarmJob(Date date, String identity, String... cronScheduleArray) throws SchedulerException {
        JobDetail job = JobBuilder.newJob(AlarmJob.class)
                .withIdentity(identity, identity)
                .build();

        Set triggerList = new HashSet();
        if (null != date)
            triggerList.add(
            TriggerBuilder
                    .newTrigger()
                    .startAt(date)
                    .build()
            );


        for (String cronSchedule : cronScheduleArray) {
            triggerList.add(setupAlarmTrigger(cronSchedule));
        }

        Map> map = new HashMap>();
        map.put(job, triggerList);

        scheduler = new StdSchedulerFactory().getScheduler();
        scheduler.start();
        scheduler.scheduleJobs(map, true);
    }

    public static void setupAlarmJob(String identity, String... cronScheduleArray) throws SchedulerException {
        setupAlarmJob(null, identity, cronScheduleArray);
    }

    public static Trigger setupAlarmTrigger(String cronSchedule) throws SchedulerException {
        return TriggerBuilder
                .newTrigger()
                .withIdentity(cronSchedule)
                .withSchedule(CronScheduleBuilder.cronSchedule(cronSchedule))
                .build();
    }