java - Job scheduler not invoke -

jobdetail job = new jobdetail(); job.setname("dummyj"); job.setjobclass(notificationcreater.class);  simpletrigger trigger = new simpletrigger(); trigger.setname("mn"); trigger.setstarttime(new date(system.currenttimemillis() + 1000)); trigger.setrepeatcount(simpletrigger.repeat_indefinitely); trigger.setrepeatinterval(30000);  scheduler scheduler = new stdschedulerfactory().getscheduler(); scheduler.start(); scheduler.schedulejob(job, trigger); 

i using above code schedule activity in notificationcreater.class error message

error:-unable store job name: 'dummyj' , group: 'default', because 1 exists identification.

if using servlets, , want run job on application startup, guess how should proceed achieve.

the job class

public class dummyjob{  public dummyjob() throws parseexception, schedulerexception {  jobdetail job = new jobdetail(); job.setname("dummyj"); job.setjobclass(notificationcreater.class);  simpletrigger trigger = new simpletrigger(); trigger.setname("mn"); trigger.setstarttime(new date(system.currenttimemillis() + 1000)); trigger.setrepeatcount(simpletrigger.repeat_indefinitely); trigger.setrepeatinterval(30000);  scheduler scheduler = new stdschedulerfactory().getscheduler(); scheduler.start(); scheduler.schedulejob(job, trigger);  } } 

the servlet

public class jobinitializerservlet extends httpservlet {  /**  *   */ private static final long serialversionuid = 5102955939315248840l;  /**  * application logger log info, debug, error messages.  */ private static final logger app_logger = logger.getlogger("applogger");  /**  * @see servlet#init(servletconfig) initializes dummyjob  */ public void init(servletconfig config) throws servletexception {      try {         dummyjob scheduler = new dummyjob();     } catch (java.text.parseexception e) {         app_logger.error(e.getlocalizedmessage(), e);     } catch (schedulerexception e) {         app_logger.error(e.getlocalizedmessage(), e);     }  } 

}

and servlet mapping

<servlet>     <description>     </description>     <display-name>jobinitializerservlet</display-name>     <servlet-name>jobinitializerservlet</servlet-name>     <servlet-class>com.job.servlet.jobinitializerservlet</servlet-class>     <load-on-startup>1</load-on-startup> </servlet> 

this initiate job deploy or start application. hope helps.