解决.quartz.ObjectAlreadyExistsException: Unable to store Job : ‘jyGroup.jyJob‘, because one already

定时任务出现异常 ： org.quartz.ObjectAlreadyExistsException: Unable to store Job : 'jyGroup.jyJob', because one already exists with this identification.
2018-07-19 09:36:48.002  INFO 6128 --- [pool-1-thread-1] gentle.test.UserSyncTask   

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util"
       xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">

    <bean id="userSyncTask" class="gentle.test.UserSyncTask"></bean>

    <task:scheduled-tasks>
        <!--每 2 秒执行一次-->
        <task:scheduled ref="userSyncTask" method="cronDepartmentsAndUsersJob" cron="0/2 * * * * ?" />
    </task:scheduled-tasks>

</beans>

package gentle.test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Resource;
import java.text.SimpleDateFormat;
import java.util.Date;


public class UserSyncTask {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Resource
    SchedulerTest test;
    @Resource
    Show show;


    public void cronDepartmentsAndUsersJob() {

        logger.info("\n\n 定时--开始，当前时间： " + dateFormat().format(new Date()));
        test.addJob();
        logger.info("\n\n 定时--结束，当前时间：" + dateFormat().format(new Date()));
    }

    private SimpleDateFormat dateFormat() {
        return new SimpleDateFormat("HH:mm:ss");
    }
}

package gentle.test;

import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import java.util.Date;

/**
 * @author silence
 * @date 2018/7/17 11:37
 */
@Service("show")
public class Show implements Job {


    private static Logger _log = LoggerFactory.getLogger(Show.class);

    @Override
    public void execute(JobExecutionContext arg0) throws JobExecutionException {

        _log.info("\n\n-------------------------------\n " +
                "It is running and the time is : " + new Date()+
                "\n-------------------------------\n");
    }

}

package gentle.test;

import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Resource;
import java.text.SimpleDateFormat;
import java.util.Date;

public class UserSyncTask {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Resource
    SchedulerTest test;
    @Resource
    Show show;

    public void cronDepartmentsAndUsersJob() {

        logger.info("\n\n 定时--开始，当前时间： " + dateFormat().format(new Date()));
//        test.addJob();
        try {
            show.execute(null);
        } catch (JobExecutionException e) {
            e.printStackTrace();
        }
        logger.info("\n\n 定时--结束，当前时间：" + dateFormat().format(new Date()));
    }

    private SimpleDateFormat dateFormat() {
        return new SimpleDateFormat("HH:mm:ss");
    }
}