spring Quartz定时调度问题？

我想用MethodInvokingJobDetailFactoryBean来实现定时对数据库的操作，我是按照书上配置的，为什么Tomcat启动时加载老不成功，求高手赐教:  
  我的配置如下：第一个是自己写的实际完成功能的类
<bean id="actualWork"
class="com.boco.common.schedule.ActualWork">
</bean>
  
  
 <bean id="job" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"> 
<property name="targetObject">
<ref bean="actualWork"/>
</property>
<property name="targetMethod">
<value>execute</value>
</property>

<property name="concurrent" value="false"></property>
</bean>
<bean id="simpleTrigger"
class="org.springframework.scheduling.quartz.SimpleTriggerBean">
<property name="jobDetail">
<ref bean="job" />
</property>
<property name="startDelay" value="2000" />
<property name="repeatInterval" value="2000" />

</bean>
                   
    <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
            <property name="triggers">            
            <list>
             <ref local="simpleTrigger" />
            </list>        
            </property>   
            
    </bean>