问题概述

Spring AOP 报错，一直显示：Error creating bean with name 'student' defined in file 的报错。从五个方向排查：第一，aspectj 包的 scope 是不是 runtime；第二，jar 包是否导全，第三，jar 包的版本是否过低；第四，xml 配置文件；第五，切入点表达式是否正确。

点击查看具体的报错信息 
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'student' defined in file [E:\DevProjects\JavaProjects\java-learning\03-framework\01-spring\chapter02\target\classes\com\aop\Student.class]: Initialization of bean failed; nested exception is java.lang.ExceptionInInitializerError

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'student' defined in file [E:\DevProjects\JavaProjects\java-learning\03-framework\01-spring\chapter02\target\classes\com\aop\Student.class]: Initialization of bean failed; nested exception is java.lang.ExceptionInInitializerError

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)

	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)

	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)

	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)

	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)

	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)

	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)

	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)

	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)

	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)

	at com.aop.Main.main(Main.java:9)

Caused by: java.lang.ExceptionInInitializerError

	at org.springframework.aop.framework.CglibAopProxy.createEnhancer(CglibAopProxy.java:236)

	at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:179)

	at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:109)

	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:469)

	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:349)

	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:298)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:423)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1633)

	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)

	... 11 more

Caused by: java.lang.IllegalStateException: Unable to load cache item

	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:79)

	at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)

	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116)

	at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291)

	at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221)

	at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:174)

	at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:153)

	at org.springframework.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73)

	... 20 more

Caused by: java.lang.ExceptionInInitializerError

	at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:243)

	at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)

	at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:329)

	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93)

	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91)

	at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)

	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)

	... 27 more

Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @5552768b

	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)

	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)

	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:200)

	at java.base/java.lang.reflect.Method.setAccessible(Method.java:194)

	at org.springframework.cglib.core.ReflectUtils$1.run(ReflectUtils.java:54)

	at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)

	at org.springframework.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:44)

	... 35 more

Process finished with exit code 1

排查问题

aspectj

如果你的 IDE 是 IDEA，导入 aspectj 依赖包时，其 Scope 有可能是 runtime。其实，这个问题很容易发现，因为 Scope 不是 Compiler 的话，@Aspect 这个注解就无法导包。

多少个 jar 包

要使用 Spring AOP，必须导入以下 6 个 jar 包：

  1. spring-beans；
  2. spring-context；
  3. spring-aop；
  4. spring-aspects；
  5. aopalliance；
  6. aspectj

jar 包版本过低

博主之前用的都是 4.3.6 版本的 jar 包，经过版本调整，索性全部设置最新版本，也就是 5.3.23 版本（截止至2022年10月25日）。以下是我运行正确的 jar 包数量和 jar 包版本：

<dependency>

  <groupId>org.springframework</groupId>

  <artifactId>spring-beans</artifactId>

  <version>5.3.23</version>

</dependency>

<dependency>

  <groupId>org.springframework</groupId>

  <artifactId>spring-context</artifactId>

  <version>5.3.23</version>

</dependency>

<dependency>

  <groupId>javax.annotation</groupId>

  <artifactId>javax.annotation-api</artifactId>

  <version>1.3.2</version>

</dependency>

<dependency>

  <groupId>org.springframework</groupId>

  <artifactId>spring-aop</artifactId>

  <version>5.3.23</version>

</dependency>

<dependency>

  <groupId>org.springframework</groupId>

  <artifactId>spring-aspects</artifactId>

  <version>5.3.23</version>

</dependency>

<dependency>

  <groupId>aopalliance</groupId>

  <artifactId>aopalliance</artifactId>

  <version>1.0</version>

</dependency>

<dependency>

  <groupId>org.aspectj</groupId>

  <artifactId>aspectjweaver</artifactId>

  <version>1.9.9.1</version>

</dependency>

配置文件是否正确

注意配置文件头标签上的配置信息，xmlns:aop、xmlns:context 等，单词拼写不要错。组件（Bean）扫描的包范围也不要写错，一定要在这个范围内，否则不能扫描：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:aop="http://www.springframework.org/schema/aop"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xsi:schemaLocation="

       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd

       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

  <context:component-scan base-package="com.aop"/>

  <context:annotation-config/>

  <aop:aspectj-autoproxy/>

</beans>

切入点表达式是否正确

切入点表达式是否写正确？切入点表达式的基本形式都是execution(* com.*.*())。其中，通配符*非常重要。具体的语法查网上其他的资料。

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