Problema com agendamento no Quatz: org.quartz.ObjectAlreadyExistsException

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Problema é o seguinte...

Estou fazendo um scheduler com o quatz pra fazer um backup do meu bd diariamente, porém, estou com esse problema:

org.quartz.ObjectAlreadyExistsException: Unable to store Job with name: 'JDBC Connection' and group: 'mysql', because one already exists with this identification. at org.quartz.simpl.RAMJobStore.storeJob(RAMJobStore.java:221) at org.quartz.simpl.RAMJobStore.storeJobAndTrigger(RAMJobStore.java:193) at org.quartz.core.QuartzScheduler.scheduleJob(QuartzScheduler.java:801) at org.quartz.impl.StdScheduler.scheduleJob(StdScheduler.java:243) at br.com.promogrape.java.scheduler.ConnectionScheduler.<init>(ConnectionScheduler.java:22) at br.com.promogrape.java.scheduler.ConnectionScheduler.contextInitialized(ConnectionScheduler.java:33) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445) at org.apache.catalina.core.StandardService.start(StandardService.java:519) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:581) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

Minhas classes estão assim:

public class ConnectionScheduler implements ServletContextListener {

	public ConnectionScheduler() throws Exception {
		SchedulerFactory sf = new StdSchedulerFactory();
		Scheduler sche = sf.getScheduler();
		sche.start();
		JobDetail jDetail = new JobDetail("JDBC Connection", "mysql",
				ConnectionJob.class);
		CronTrigger crTrigger = new CronTrigger("cronTrigger", "mysql",
				"0 0 23 * * ? *");
		sche.scheduleJob(jDetail, crTrigger);
	}

	@Override
	public void contextDestroyed(ServletContextEvent arg0) {
		// TODO Auto-generated method stub
	}

	@Override
	public void contextInitialized(ServletContextEvent arg0) {
		try {
			new ConnectionScheduler();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

public class ConnectionJob implements Job {

	private MySQLDumper dumper;

	public ConnectionJob() {
		dumper = new MySQLDumper();
	}

	public void execute(JobExecutionContext context)
			throws JobExecutionException {
		System.out.println("Job name:" + context.getJobDetail().getName());
		System.out.println("Group name:" + context.getJobDetail().getGroup());
		System.out.println("Trigger name:" + context.getTrigger().getName());
		System.out.println("Firing Time:" + context.getFireTime());

		try {
			dumper.export();
		} catch (Exception s) {
			s.printStackTrace();
			System.exit(0);
		}
	}
}

Na exception diz que o agendamento já existe, mas não entendo o pq se estou iniciando a aplicação.

Alguma idéia?

Abraço

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