Retrieve servletContext reference in quartz scheduler - servlets

Question

I am using Quartz Scheduler with my spring 3.0 based application. I am successfully able to create new schedulers and they are working fine.
I have seen thus reference.
But.. I am not able to retrieve servletContext in my quartz job file. can anyone help me for How to retrieve servletContext reference in executeInternal() method ??

Answer 1

I had a similar need. I sorted it out in a similar fashion to the solution presented here.
In my servlet context listener I am setting the servlet context using the job data map object which then is set for a job:
#Override
public void contextInitialized(ServletContextEvent sce) {
try {
//Create & start the scheduler.
StdSchedulerFactory factory = new StdSchedulerFactory();
factory.initialize(sce.getServletContext().getResourceAsStream("/WEB-INF/my_quartz.properties"));
scheduler = factory.getScheduler();
//pass the servlet context to the job
JobDataMap jobDataMap = new JobDataMap();
jobDataMap.put("servletContext", sce.getServletContext());
// define the job and tie it to our job's class
JobDetail job = newJob(ImageCheckJob.class).withIdentity("job1", "group1").usingJobData(jobDataMap).build();
// Trigger the job to run now, and then repeat every 3 seconds
Trigger trigger = newTrigger().withIdentity("trigger1", "group1").startNow()
.withSchedule(simpleSchedule().withIntervalInMilliseconds(3000L).repeatForever()).build();
// Tell quartz to schedule the job using our trigger
scheduler.scheduleJob(job, trigger);
// and start it off
scheduler.start();
} catch (SchedulerException ex) {
log.error(null, ex);
}
}
Then inside my job I am doing this:
#Override
public void execute(JobExecutionContext context) throws JobExecutionException {
ServletContext servletContext = (ServletContext) context.getMergedJobDataMap().get("servletContext");
//...
}
EDIT:
Also since you mention that you are using Spring I found this link, where in the last post a guy mentions to implement ServletContextAware. Personally, I would go with the JobDataMap, since that is its role.

Answer 2

Starting from Quartz 2.0, if you are starting the scheduler inside your webapp via QuartzInitializerServlet in your web.xml, you can store ServletContext in your SchedulerContext by setting scheduler-context-servlet-context-key as an init parameter as follows:
<!-- Quartz Scheduler Initializer Servlet -->
<servlet>
<servlet-name>QuartzInitializer</servlet-name>
<servlet-class>org.quartz.ee.servlet.QuartzInitializerServlet</servlet-class>
<init-param>
<param-name>shutdown-on-unload</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>start-scheduler-on-load</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>scheduler-context-servlet-context-key</param-name>
<param-value>servletContext</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
See the following reference in code: https://github.com/elventear/quartz-scheduler/blob/quartz-2.0.0-rc/quartz/src/main/java/org/quartz/ee/servlet/QuartzInitializerServlet.java#L122

Answer 3

To get to your ServletContext from a QuartzJob configure like Kalman said, Then here is some code to get a actual "servletContext"
private void initContext(JobExecutionContext jobContext) {
Scheduler scheduler = jobContext.getScheduler();
SchedulerContext schedulerContext = null;
try {
schedulerContext = scheduler.getContext();
} catch (SchedulerException e) {
e.printStackTrace();
}
ServletContext servletContext = (ServletContext)schedulerContext.get("servletContext");
System.out.println("ServletContextName : "+ servletContext.getServletContextName());