SSM移到新类中再实例化后调用报空指针异常

水晶圣教士 2020-01-14 09:29:04

原正常代码：

@Component

public class TimerTaskImpl {

	@Autowired

	private OrderDao orderDao; //D

	

	@Scheduled(cron = "0 0/1 * * * ?")

	public void Task1() {



		List<Order> listOrderLoans = new ArrayList<Order>(); //A

		listOrderLoans = orderDao.getOrderPending_Loans(); //B

		logger.debug("listOrderLoans#"+listOrderLoans.size()); //C

		

		......

	}

}

新类中的代码：



@Component

public class TaskLoans {

	@Autowired

	private OrderDao orderDao;



	public void process() {

		List<Order> listOrderLoans = new ArrayList<Order>();

		listOrderLoans = orderDao.getOrderPending_Loans();

		logger.debug("listOrderLoans#"+listOrderLoans.size());

	...

	}

}

调用的代码：

		TaskLoans tl = new TaskLoans();

		tl.process();

SSM框架，做了一个定时任务，以上代码可以正常运行，可是我把A、B、C、D段代码移到一个新建类的方法中，通过实例化后调用，执行到代码B时就报java.lang.NullPointerException，单步调试发现移到新类后，orderDao空了，这是什么原因？是不是我哪里注解少了？谢谢。

后面是报错日志：

[2020-01-14 09:42:00,287][ERROR][org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler][scheduler-1](TaskUtils.java:95)[Unexpected error occurred in scheduled task.]

java.lang.NullPointerException

	at com.xsrcc.ssmcxf.autotask.TaskLoans.process(TaskLoans.java:28)

	at com.xsrcc.ssmcxf.autotask.TimerTaskImpl.Task1(TimerTaskImpl.java:106)

	at com.xsrcc.ssmcxf.autotask.TimerTaskImpl$$FastClassBySpringCGLIB$$6f96cc76.invoke(<generated>)

	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)

	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)

	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)

	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)

	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266)

	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)

	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)

	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)

	at com.xsrcc.ssmcxf.autotask.TimerTaskImpl$$EnhancerBySpringCGLIB$$84a22122.Task1(<generated>)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:483)

	at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)

	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)

	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)

	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

	at java.util.concurrent.FutureTask.run(FutureTask.java:266)

	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)

	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

	at java.lang.Thread.run(Thread.java:745)