Integrating Quartz Scheduler in Struts 2 Web Application

 
In our previous article we learn about Quartz 2 hello world example along with types of Triggers in Quartz 2, In this article we shall learn to Integrating Quartz 2 Scheduler in Struts 2 web Application. To know more about Quartz please visit its Official website.
 

Library required

 
Commonly Required Struts 2 Jars
commons-logging-1.1.1.jar
log4j-1.2.16.jar
quartz-2.2.1.jar
slf4j-api-1.6.6.jar
slf4j-log4j12-1.6.6.jar
 

Scheduler Job

 
Create a Quartz’s job

package com.quartz;

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

public class QuartzJob implements Job {
	public void execute(JobExecutionContext context)
			throws JobExecutionException {
		System.out.println("Struts 2 + Quartz 2.2.1");
	}
}

Servlet Listener

 
Now Create servlet listener class by implementing ServletContextListener interface and override contextInitialized and contextDestroyed methods with your logic’s.

package com.quartz;

import static org.quartz.JobBuilder.newJob;
import static org.quartz.TriggerBuilder.newTrigger;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.quartz.CronScheduleBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;

public class QuartzListener implements ServletContextListener {
	Scheduler scheduler = null;

	@Override
	public void contextInitialized(ServletContextEvent servletContext) {
		System.out.println("Context Initialized");
		
		try {
			// Setup the Job class and the Job group
			JobDetail job = newJob(QuartzJob.class).withIdentity(
					"CronQuartzJob", "Group").build();

			// Create a Trigger that fires every 5 minutes.
			Trigger trigger = newTrigger()
			.withIdentity("TriggerName", "Group")
			.withSchedule(CronScheduleBuilder.cronSchedule("0/5 * * * * ?"))
			.build();

			// Setup the Job and Trigger with Scheduler & schedule jobs
			scheduler = new StdSchedulerFactory().getScheduler();
			scheduler.start();
			scheduler.scheduleJob(job, trigger);
		}
		catch (SchedulerException e) {
			System.err.println(e.getMessage());
		}
	}

	@Override
	public void contextDestroyed(ServletContextEvent servletContext) {
		System.out.println("Context Destroyed");
		try
		{
			scheduler.shutdown();
		}
		catch (SchedulerException e)
		{
			System.err.println(e.getMessage());
		}
	}
}

 
Recommended Article

web.xml

 
Configure the listener class QuartzSchedulerListener.java into the web.xml file as shown below

<web-app>
<display-name>Quartz 2 + Struts 2</display-name>
<filter>
  <filter-name>struts2</filter-name>
  <filter-class>
       org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
   </filter-class>
</filter>
 
<filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
   <listener-class>
      com.quartz.QuartzListener
   </listener-class>
 </listener>
</web-app>

Demo

 
Now on starting the Tomcat Server, the project gets started, and so the listener class QuartzSchedulerListener.java registered in web.xml will be fired, and following logs is obtained at the console
 

 

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