Quartz定机时制设置每天凌晨2点却执行好几遍

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" ><beans>    <bean id="statisticsService"        class="Stat.service.impl.StatisticsServiceImpl">    </bean>    <bean id="statisticsServiceDetail"        class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">        <property name="targetObject">            <ref bean="statisticsService" />        </property>        <property name="targetMethod">            <value>test</value>        </property>    </bean>    <!-- 配置调度任务,复杂定制模式,月份中的日期和星期不能同时设置   -->    <bean id="cronReportTrigger"        class="org.springframework.scheduling.quartz.CronTriggerBean">        <property name="jobDetail">            <ref bean="statisticsServiceDetail" />        </property>        <property name="cronExpression">            <value>0 0 2 ? * *</value>        </property>    </bean>    <!-- 启动调度 -->    <bean id="start"        class="org.springframework.scheduling.quartz.SchedulerFactoryBean">        <property name="triggers">            <list>                <ref bean="cronReportTrigger" />            </list>        </property>    </bean></beans>