NullPointerException on calling Sceduler.scheduleJob

Question

Hi,
I am new to the Quartz API.
On calling Sceduler.scheduleJob () method I am getting NullPointerException. I am not bale to figure out why this is happening.
Please see my Context Listener class below.
package com.ustri.batman.listener;
import java.text.ParseException;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;
import com.ustri.batman.reporter.ReportJob;
import com.ustri.batman.reporter.WIPReportJob;
public class ReportListener implements ServletContextListener {
     Scheduler sched;
     Scheduler wipSched;
     public void contextDestroyed(ServletContextEvent arg0) {
          // TODO Auto-generated method stub
          System.out
          .println("************inside context destroy********************");
          if (sched != null) {
               try {
                    sched.shutdown();
                    wipSched.shutdown();
               } catch (SchedulerException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
          System.out
          .println("************scheduler shut down********************");
     public void contextInitialized(ServletContextEvent arg0) {
          // TODO Auto-generated method stub
          System.out
                    .println("************inside context init********************");
          StdSchedulerFactory schedFact = new StdSchedulerFactory();
          try {
               sched = schedFact.getScheduler();
               JobDetail jobDetail = new JobDetail("Weekely Report",
                         "Report Generation", ReportJob.class);
               CronTrigger trigger = new CronTrigger("Weekely Report",
                         "Report Generation");
               trigger.setCronExpression("0 * * * * ?");
               JobDetail wipJobDetail = new JobDetail("WIP Report",
                         "WIP Report Generation", WIPReportJob.class);
               CronTrigger wipTrigger = new CronTrigger("WIP Report",
               "WIP Report Generation");
               wipTrigger.setCronExpression("0 * 15 ? * 7 *");
               sched.scheduleJob(jobDetail, trigger);
               wipSched.scheduleJob(wipJobDetail, wipTrigger);
               sched.start();
               wipSched.start();
               System.out
                         .println("**********************************scheduler started*********************************");
          } catch(NullPointerException e) {
                    e.printStackTrace();
          catch (SchedulerException e) {
               System.out.println("************* Caught SchedulerException ");
               e.printStackTrace();
          } catch (ParseException e) {
               System.out.println("************* ParseException ");
               e.printStackTrace();
Please help.
Thanks,
Neelambary

Answer 1

All,
I am currently reading 'commands' from a db and placing them into a job>scheduler + trigger.
I can perform this, But I always get a NullPointerException. The code will run, but it will not do so without producing this error:
Exception in thread "main" java.lang.NullPointerException
     at mybeans.SchedulerScheduler.runScheduler(SchedulerScheduler.java:61)
     at mybeans.SchedulerScheduler.main(SchedulerScheduler.java:31)
line 61 is :job.getJobDataMap().put("command", hash.get("command" + i).toString());
line 31 is:           scheduler.runScheduler();
My code is 2 classes.
1. is Command, which implements Job
public class Command implements Job {
     static Log log = LogFactory.getLog(EmailScheduler.class);
     public void execute(JobExecutionContext context){
          //every job has its own job detail.
          JobDataMap jobDataMap = context.getJobDetail().getJobDataMap();
          //System.out.println(jobDataMap.size());
          //String userid = jobDataMap.get("userid").toString();
          //String command = jobDataMap.get("command").toString();
          //iterate over key/value pairs.
          Iterator iter = jobDataMap.keySet().iterator();
          while(iter.hasNext()){
               Object key = iter.next();
               Object value = jobDataMap.get(key);
               System.out.println(key + " " + value);
               log.info("Key " + key + " - Value " + value);
          System.out.println("User id is: " + jobDataMap.get("userid") + "command is :" + jobDataMap.get("command") );
}//class end.
2. SchedulerScheduler which reads the db and schedules the jobs.
public class SchedulerScheduler {
     private JobPoll jobPoll;
     static Log log = LogFactory.getLog(EmailScheduler.class);
     public static void main(String[] args)throws SchedulerException {
          SchedulerScheduler scheduler = new SchedulerScheduler();
          scheduler.runScheduler();
     public void runScheduler(){
          Scheduler scheduler = null;
          try{
          //lets get our jobs from jobs db
               jobPoll = new JobPoll();
               Hashtable hash = jobPoll.pollJobs();
               int hashSize = hash.size();
          scheduler = StdSchedulerFactory.getDefaultScheduler();
          scheduler.start();
//System.out.println("Scheduling started at : " + new Date());
          //Now we have our jobs in a Hashtable, let's schedule them.
          //1st, add our hash to jobdetails and jobs.
               for(int i =0; i<hashSize; i++){
               JobDetail job = new JobDetail("eassistjob" + Integer.toString(i), "eassistgroup" + Integer.toString(i), Command.class);
                    job.getJobDataMap().put("command", hash.get("command" + i).toString());
                    job.getJobDataMap().put("userid", hash.get("userid" + i).toString());
          //create a trigger.=immediate start, runs twice, every 100,000 milliseconds(100seconds).
          Trigger trigger = TriggerUtils.makeImmediateTrigger(-1, 10000);
          trigger.setName("JobPollTrigger" + Integer.toString(i));
          //scheduler.addJob(job, false);
          scheduler.scheduleJob(job, trigger);
}catch(SchedulerException se){
     log.error(se);
M