最近在用springboot搭建項目框架時，遇到了如下錯誤，查詢了一番，原來是沒有引入spring框架的aop包導致：
問題：
1 ERROR o.s.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@2e3252] to prepare test instance [com.zsm.sb.service.impl.StudentServiceImpTest@d978ab9] 2 org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.zsm.sb.service.impl.StudentServiceImpTest': Unsatisfied dependency expressed through field 'studentServiceImp'; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'studentServiceImpl' is expected to be of type 'com.zsm.sb.service.impl.StudentServiceImpl' but was actually of type 'com.sun.proxy.$Proxy101' 3 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587) 4 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) 5 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373) 6 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344) 7 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:399) 8 at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) 9 at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) 10 at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:44) 11 at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:242) 12 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227) 13 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) 14 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 15 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) 16 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246) 17 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) 18 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 19 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 20 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 21 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 22 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 23 at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 24 at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) 25 at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 26 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) 27 at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365) 28 at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273) 29 at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238) 30 at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159) 31 at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:379) 32 at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:340) 33 at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:125) 34 at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:413) 35 Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'studentServiceImpl' is expected to be of type 'com.zsm.sb.service.impl.StudentServiceImpl' but was actually of type 'com.sun.proxy.$Proxy101' 36 at org.springframework.beans.factory.support.DefaultListableBeanFactory.checkBeanNotOfRequiredType(DefaultListableBeanFactory.java:1527) 37 at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1505) 38 at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104) 39 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065) 40 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584) 41 ... 31 common frames omitted
解決方案：
1.添加AOP依賴包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
2.配置參數：
spring.aop.proxy-target-class=true
<aop:aspectj-autoproxy proxy-target-class="true"/>
spring對AOP有兩種實現方式，一種是動態代理，它是通過接口方式實現的，要求所代理的類一定是實現了某一個接口，對一般的類就無法代理，spring默認是這種；一種是通過設置proxy-target-class="true"，則是使用CGLIB實現AOP，CGLIB直接生成二進制碼，使得普通類也可以實現AOP。