在做定时器时出错，帮忙给解决一下，谢谢了

配置文件： <?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> 
<!-- 本地应用 --> 
    <bean id="JobInfo" class="com.spnc.agri.web.webwork.action.JobInfoAction"> 
</bean> 
    <!-- 定时器 --> 
<bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean"> 
  <property name="targetObject" ref="JobInfo" /> 
  <property name="targetMethod" value="senddoublelist"/>  
  <property name="concurrent" value="false" /> 
</bean> 
<bean id="cronTrigger" 
class="org.springframework.scheduling.quartz.CronTriggerBean"> 
<property name="jobDetail" ref="jobDetail" /> 
<property name="cronExpression" value="0 15 16 * * ?" /> 
</bean> <bean id="scheduler" 
class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> 
<property name="triggers"> 
<list> 
<ref bean="cronTrigger" /> 
</list> 
</property> 
</bean> 
</beans> 
要执行的方法 
public String senddoublelist() { 
System.out.println("开始执行！！！"); 
Map filterMap0 = new HashMap(); 
filterMap0.put("status", "0"); 
joblist = jobInfoManager.findAllBy(filterMap0);} 
在执行到joblist=joblist = jobInfoManager.findAllBy(filterMap0);} 
时报错 
错误如下： 
[org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob] [WARN] Could not invoke method 'senddoublelist' on target object [com.spnc.agri.web.webwork.action.JobInfoAction@bb1ee] 
java.lang.NullPointerException 
at com.spnc.agri.web.webwork.action.JobInfoAction.senddoublelist(JobInfoAction.java:925) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:585) 
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:270) 
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:199) 
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:90) 
at org.quartz.core.JobRunShell.run(JobRunShell.java:203) 
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)