org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cashier': Unsatisfied dependency expressed through field 'bookService'; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'bookService' is expected to be of type 'pw.fengya.tx.BookService' but was actually of type 'com.sun.proxy.$Proxy19'

     at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)

     at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)

     at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)

     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)

     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)

     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)

     at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)

     at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$176/667821226.getObject(Unknown Source)

     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)

     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)

     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)

     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)

     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)

     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)

     at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)

     at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)

     at pw.fengya.tx.Test.<init>(Test.java:19)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

     at java.lang.reflect.Constructor.newInstance(Constructor.java:408)

     at org.junit.platform.commons.util.ReflectionUtils.newInstance(ReflectionUtils.java:347)

     at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:60)

     at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.instantiateTestClass(ClassTestDescriptor.java:197)

     at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.instantiateAndPostProcessTestInstance(ClassTestDescriptor.java:188)

     at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$testInstanceProvider$1(ClassTestDescriptor.java:181)

     at org.junit.jupiter.engine.descriptor.ClassTestDescriptor$$Lambda$154/1860944798.getTestInstance(Unknown Source)

     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:80)

     at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:57)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:60)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$136/201556483.accept(Unknown Source)

     at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)

     at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)

     at java.util.Iterator.forEachRemaining(Iterator.java:116)

     at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)

     at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)

     at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)

     at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)

     at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)

     at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)

     at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$133/1287712235.execute(Unknown Source)

     at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$136/201556483.accept(Unknown Source)

     at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)

     at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)

     at java.util.Iterator.forEachRemaining(Iterator.java:116)

     at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)

     at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)

     at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)

     at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)

     at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)

     at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)

     at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$$Lambda$133/1287712235.execute(Unknown Source)

     at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)

     at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)

     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)

     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)

     at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)

     at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)

     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)

     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)

     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)

     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

 Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'bookService' is expected to be of type 'pw.fengya.tx.BookService' but was actually of type 'com.sun.proxy.$Proxy19'

     at org.springframework.beans.factory.support.DefaultListableBeanFactory.checkBeanNotOfRequiredType(DefaultListableBeanFactory.java:1527)

     at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1505)

     at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)

     at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)

     at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)

     ... 72 more

最近在学习Spring框架的时候，很容易犯下的一个错误，需要在配置文件中打开aop命名空间，并设置如下属性：

<aop:config proxy-target-class="true"></aop:config>

不知道为什么，在使用注解配置bean的时候，很容易报的一个错，尤其是自定义的接口与实现类

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