Spring@Scheduled 定时任没执行!

项目主要配置及代码如下，但是启动服务后，一直没执行这个方法，不知什么原因。请指点

package com.yl.reqPos;
import java.text.SimpleDateFormat;

import java.util.Date;
import org.springframework.context.annotation.Lazy;
import org.springframework.scheduling.annotation.Scheduled;

import org.springframework.stereotype.Component;
@Component
@Lazy(false)
public class Singer {
@Scheduled(cron  ="0/5 * * * * *")     //第二种方式  
    public void singing(){  
    Date date=new Date();  
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");  
    System.out.println(sdf.format(date));  
}  
}

applicationContext-jobs.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:task="http://www.springframework.org/schema/task" 
xmlns:context="http://www.springframework.org/schema/context" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd 
http://www.springframework.org/schema/task 
http://www.springframework.org/schema/task/spring-task-3.2.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.2.xsd"
default-lazy-init="false">
<context:component-scan base-package="com.yl.reqPos.*" />
queue-capacity="500" rejection-policy="CALLER_RUNS" />