job调用mybatis dao层方法时报空指针错误

Question

代码
public void addYzToken(){

    String refreshToken="";
    try {
        refreshToken=tokenDao.getLastYzToken().getRefreshToken();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    System.out.println(refreshToken+"---");
    }

    异常信息：
    java.lang.NullPointerException

at com.sinowel.job.RefreshTokenTask.addYzToken(RefreshTokenTask.java:113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:64)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:53)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)

spring 配置

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="configLocation" value="classpath:db/sqlMapConfig.xml" />
    <property name="mapperLocations" value="classpath:mybatis/com/sinowel/data/**/*.xml" />
    <property name="dataSource" ref="dataSource" />
</bean>
<!--MyBatis SqlSessionTemplate注入 -->
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
    <!-- <property name="sqlSessionFactory" ref="sqlSessionFactory" /> -->
    <constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
</bean>

<!--自定义commonDao注入 -->
<bean id="dao" class="com.sinowel.core.dao.ibatis.IbatisDao">
    <property name="sqlSessionTemplate" ref="sqlSessionTemplate" />
</bean>

求大神指点

Answer 1

首先，你是怎么初始化这个DAO对象的，Spring托管的呢，还是手动创建的对象；
其次，如果是Spring自动注入的，这个类上面有没有注解属性呢，扫描包路径有没有包含这个类。