Email Notifications and Reminders in Java Web app using Quartz Scheduler

Question

I want to develop a simple Java Web app to send an email notifications after some task is done, such as a request submitted for approval, and reminders (to say approvers) at regular intervals. I want to do this using the Quartz Scheduler. I am a newbie, so can anyone help me to start on this.

Thanks in Advance.

I copy and pasted the JAR file : quartz-1.8.0 in WEB-INF\lib and even in common\lib, then it is not found while importing in my Java file. :(

Answer 1

Create a servlet that starts at web-app init.

<web-app>
    ...
    <servlet>
     <servlet-name>Emailer</servlet-name>
     <servlet-class>my.servlet.Emailer</servlet-class>
     <load-on-startup>1</load-on-startup>
    </servlet>
    ...
</web-app>

In init() of the servlet configure your scheduler (the example below triggers every 10 minutes)

SchedulerFactory schFact = new org.quartz.impl.StdSchedulerFactory();
Scheduler sched = schFact.getScheduler();
JobDetail job = new JobDetail("job1", "group1", EmailerJob.class);
CronTrigger trigger = new CronTrigger("trigger1", "group1", "job1", "group1", "* 0/10 * * * ?");
sched.addJob(job, true);
sched.start();

Write a Class inplementing Job interface of Quartz.

EmailerJob implement Job{
        public void execute(JobExecutionContext arg0) throws JobExecutionException {
        //Code to send mails goes here
    }

}

P.S. The code above is not-tested, but it gives you a fair idea what to do.

As @jmort253 rightly pointed, Quartz tutorial is the best resource and if I remember correctly, they have an scheduled emailer example done somewhere in that.

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Update

Alright, Google to solve your issue. And here is your most detailed solution that anyone can give to you! Java – Job Scheduling in web application with quartz API

Edit#1 You may use ContextListener instead of servlet to initiate Quartz scheduler.

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Update 1

As @jhouse rightly mentioned that instead of writing your own Job that handle mailing, you can ask Quartz predefined SendMailJob class to do the same. Thanks @jhouse.