Quartz Tutorial : Configure Quartz in web Application

This Tutorial will guide you how to configure Quartz Scheduler in J2EE web Application.
To introduce quartz into the web application we need to specify a context listener into the web application which notify the event of context start up as well as shut down to start and stop the quartz scheduler.
Look in the fallowing example to plug qartz in to the web appliction

Step 1: Create the dynamic web application into the eclipse
Step 2: add the fallowing entries inside web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>TestQuartzApi</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<listener>
<listener-class>com.test.QuartzInitializerListener</listener-class>
</listener>
</web-app>

Step 3: Create your Job which implements Quartz's Job as fallows

package com.test;

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

public class MyJob implements Job {

@Override
public void execute(JobExecutionContext ctx) throws JobExecutionException {
System.out.println("Quartz is executing my Job");
}

}

Step4 : Create your QuartzInitializerListener class which implements ServletContextListner and override the contextInitialized method,in the contextInitialized method we are providing the configuration regarding Scheduler and Trigger as fallows

package com.test;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.impl.StdSchedulerFactory;

public class QuartzInitializerListener implements ServletContextListener {

public void contextDestroyed(ServletContextEvent arg0){}



public void contextInitialized(ServletContextEvent arg0)
{


System.out.println("Starting The Application");
try{
SchedulerFactory schedulerFactory = new StdSchedulerFactory();
Scheduler scheduler = schedulerFactory.getScheduler();

long ctime = System.currentTimeMillis();

JobDetail job = new JobDetail();
job.setName("MyJobName");
job.setJobClass(MyJob.class);

CronTrigger crt = new CronTrigger();
crt.setName("MyTriggerName");
crt.setCronExpression("0/30 * * * * ?");

scheduler.start();
scheduler.scheduleJob(job, crt);

}catch (Exception e) {
System.out.println(e);
}

}
}

Step 5: Make sure to include quartz api related jar in the build path and run your application,here you goes

Quartz Tutorial

Quartz is an open source job scheduling framework that provides simple but powerful mechanisms for job scheduling in Java applications. Quartz allows developers to schedule jobs by time interval or by time of day. It implements many-to-many relationships for jobs and triggers and can associate multiple jobs with different triggers.

Here I am providing a simple guide to Quartz API with the help of fallowing example

Step 1: Create a Simple java Application in eclipse.

Step 2: Add the fallowing jars to the classpath
quartz-1.6.0.jar
commons-collections-3.2.jar
commons-logging-1.1.1.jar
jta-1.1.jar


Step 3:Create your job which implements Job interface

package com.test;

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

public class MyJob implements Job {

@Override
public void execute(JobExecutionContext ctx) throws JobExecutionException {
System.out.println("Quartz is executing my Job");
}

}

Step 4: Create Your Schedular and test application

package com.test;

import java.text.ParseException;

import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;

public class JobSchedular {
public static void main(String[] args) throws ParseException, SchedulerException {
JobDetail job = new JobDetail();
job.setName("MyJobName");
job.setJobClass(MyJob.class);

CronTrigger crt = new CronTrigger();
crt.setName("MyTriggerName");
crt.setCronExpression("0/30 * * * * ");

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

}

Step 5: Here is the outcome