Java Trigger ( Quartz )

Quartz  is a library that can be used to implement scheduler in JAVA application.

This library supports for modify Triggering in many variations.
You have to implement your class implementing Job class as "TestJob.java".

TestJob.java

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

public class TestJob implements Job {
    @Override
    public void execute(JobExecutionContext jec) throws JobExecutionException {
        System.out.println("Hello Quartz!");
    }
}

This "Schedule.java" will be triggered by 5 seconds.

Schedule.java 

import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;

public class Schedule {

    public static void main(String[] args) throws Exception {
        JobDetail job = JobBuilder.newJob(TestJob.class).withIdentity("testJob", "group1").build();

        Trigger trigger = TriggerBuilder
                .newTrigger()
                .withIdentity("dummyTriggerName", "group1")
                .withSchedule(
                SimpleScheduleBuilder.simpleSchedule()
                .withIntervalInSeconds(5).repeatForever())
                .build();

        Scheduler scheduler = new StdSchedulerFactory().getScheduler();
        scheduler.start();
        scheduler.scheduleJob(job, trigger);

    }
}


And you can use Quartz as a cron job.

Cron.java

import org.quartz.CronScheduleBuilder;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.impl.StdSchedulerFactory;

public class Cron 
{
    public static void main( String[] args ) throws Exception
    {
    JobDetail job = JobBuilder.newJob(TestJob.class)
.withIdentity("testJobName", "group1").build();

    Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("dummyTriggerName", "group1")
.withSchedule(
CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
.build();

    Scheduler scheduler = new StdSchedulerFactory().getScheduler();
    scheduler.start();
    scheduler.scheduleJob(job, trigger);

    }
}


Following libraries must be added to the projects.

• quartz-2.1.6.jar
• log4j-1.2.16.jar
• c3p0-0.9.1.1.jar
• slf4j-log4j12-1.6.1.jar
• slf4j-api-1.6.1.jar