package com.zendaimoney.online.dao.pay;



@Component

public class PayDao{

//一些方法

}





@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(loader = AnnotationConfigContextLoader.class)

public class PayDaoTest{





    @Autowired

    private ApplicationContext applicationContext;

    

//	@Autowired

//  protected PayDao payDao;  //1.无法注入



    @Test

    public void findByUserId(){

        //2.applicationContext这个注入成功，但是在aplicationContext.getBean(PayDao.class);报错

    	System.out.println(applicationContext==null);

    	PayDao payDao=applicationContext.getBean(PayDao.class);

    	System.out.println(payDao==null);



    	//payDao.findByUserId(BigDecimal.valueOf(1));

    }





}





问题是，为什么在getBean的时候报错,但是com.zendaimoney.online.dao.pay.PayDao的路径和类名都是对的。却找不到bean？



org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.zendaimoney.online.dao.pay.PayDao] is defined: expected single bean but found 0: 

	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:271)

	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1101)

	at com.zendaimoney.online.dao.pay.PayDaoTest.findByUserId(PayDaoTest.java:24)

	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:597)

	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)

	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)

	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)

	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)

	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)

	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)

	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

	at org.springframe