caused by:org.springframework.beans.factory.BeanCreationException:Could not autowire field

1 Error description

Org.springframework.beans.factory.BeanCreationException:Error creating bean with Name ' Com.sc.oa.test.timer.dao.TimerDaoTest ': Injection of autowired dependencies failed; Nested exception is org.springframework.beans.factory.BeanCreationException:Could not Autowire field:private Com.sc.oa.timer.dao.TimerDao Com.sc.oa.test.timer.dao.TimerDaoTest.timerDao; Nested exception is Org.springframework.beans.factory.NoSuchBeanDefinitionException:No qualifying bean of type [ Com.sc.oa.timer.dao.TimerDao] found for dependency:expected at least 1 beans which qualifies as Autowire candidate for Thi s dependency. Dependency annotations: {@org. springframework.beans.factory.annotation.Autowired (required=true)}at Org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues ( autowiredannotationbeanpostprocessor.java:292) at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean ( abstractautowirecapablebeanfactory.java:1185)At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties ( abstractautowirecapablebeanfactory.java:384) at Org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies ( DEPENDENCYINJECTIONTESTEXECUTIONLISTENER.JAVA:110) at Org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance ( DEPENDENCYINJECTIONTESTEXECUTIONLISTENER.JAVA:75) at Org.springframework.test.context.TestContextManager.prepareTestInstance (testcontextmanager.java:331) at Org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest (springjunit4classrunner.java:213) at Org.springframework.test.context.junit4.springjunit4classrunner$1.runreflectivecall ( springjunit4classrunner.java:290) at Org.junit.internal.runners.model.ReflectiveCallable.run ( REFLECTIVECALLABLE.JAVA:12) at Org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock ( springjunit4classrunner.java:292) at org.springFramework.test.context.junit4.SpringJUnit4ClassRunner.runChild (springjunit4classrunner.java:233) at Org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild (springjunit4classrunner.java:87) at Org.junit.runners.parentrunner$3.run (parentrunner.java:238) at Org.junit.runners.parentrunner$1.schedule ( parentrunner.java:63) at Org.junit.runners.ParentRunner.runChildren (parentrunner.java:236) at org.junit.runners.parentrunner.access$000 (parentrunner.java:53) at Org.junit.runners.parentrunner$2.evaluate ( parentrunner.java:229) at Org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate ( RUNBEFORETESTCLASSCALLBACKS.JAVA:61) at Org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate ( runaftertestclasscallbacks.java:71) at Org.junit.runners.ParentRunner.run (parentrunner.java:309) at Org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run (springjunit4classrunner.java:176) at Org.eclipse.jdt.internal.junit4.runner.JUnit4TesTreference.run (junit4testreference.java:50) at Org.eclipse.jdt.internal.junit.runner.TestExecution.run ( testexecution.java:38) at Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (Remotetestrunner.java : 459) at Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:675) at Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run (remotetestrunner.java:382) at Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main (remotetestrunner.java:192) caused by: Org.springframework.beans.factory.BeanCreationException:Could not Autowire field:private Com.sc.oa.timer.dao.TimerDao Com.sc.oa.test.timer.dao.TimerDaoTest.timerDao; Nested exception is Org.springframework.beans.factory.NoSuchBeanDefinitionException:No qualifying bean of type [ Com.sc.oa.timer.dao.TimerDao] found for dependency:expected at least 1 beans which qualifies as Autowire candidate for Thi s dependency. Dependency annotations: {@org. springframework.beans.factory.annotation.Autowired (requIred=true)}at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$ Autowiredfieldelement.inject (autowiredannotationbeanpostprocessor.java:508) at Org.springframework.beans.factory.annotation.InjectionMetadata.inject (injectionmetadata.java:87) at Org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues ( autowiredannotationbeanpostprocessor.java:289) ... morecaused by:org.springframework.beans.factory.NoSuchBeanDefinitionException:No Qualifying Bean of type [ Com.sc.oa.timer.dao.TimerDao] found for dependency:expected at least 1 beans which qualifies as Autowire candidate for Thi s dependency. Dependency annotations: {@org. springframework.beans.factory.annotation.Autowired (required=true)}at Org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException ( defaultlistablebeanfactory.java:1103) at Org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDEpendency (defaultlistablebeanfactory.java:963) at Org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency ( defaultlistablebeanfactory.java:858) at Org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject (autowiredannotationbeanpostprocessor.java:480) ... More

2 Error Reason

Analysis of the information printed by the console that the JUnit unit test, only the DAO interface, did not write its implementation, the test will invoke the DAO interface method, and to implement it, but there is a lack of interface implementation, that is, the query method (data processing part)

3 Solutions

Create DAO implementations, implement their own interfaces, query methods

caused by:org.springframework.beans.factory.BeanCreationException:Could not autowire field