Spring错误——org.aspectj.weaver.reflect.ReflectionWorld$ReflectionWorldException

• 背景：学习切面，测试前置通知功能，xml配置如下

  <?xml version="1.0" encoding="UTF-8"?>
  <beans xmlns="http://www.springframework.org/schema/beans"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:context="http://www.springframework.org/schema/context"
         xmlns:aop="http://www.springframework.org/schema/aop"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans.xsd
          http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context.xsd
          http://www.springframework.org/schema/aop
          http://www.springframework.org/schema/aop/spring-aop.xsd" >
  
          <bean id="ikAspect" class="com.jing.spring.aop.IKAspect"></bean>
          <bean id="ikAspectBiz" class="com.jing.spring.aop.IKAspectBiz"></bean>
  
          <aop:config>
                  <aop:aspect id="ikAspectAop" ref="ikAspect">
                          <aop:pointcut id="ikPoint" expression="execution(* com.jing.spring.aop.IKAspectBiz.*(..))"></aop:pointcut>
                          <aop:before method="aspectBefore" pointcut-ref="ikPoint"></aop:before>
                  </aop:aspect>
          </aop:config>
  </beans>

• 报错:org.aspectj.weaver.reflect.ReflectionWorld$ReflectionWorldException

  Caused by: java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
      at java.lang.Class.getDeclaredConstructors0(Native Method)
      at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
      at java.lang.Class.getConstructor0(Class.java:3075)
      at java.lang.Class.getDeclaredConstructor(Class.java:2178)
      at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80)
      ... 66 more
  Caused by: java.lang.ClassNotFoundException: org.aspectj.weaver.reflect.ReflectionWorld$ReflectionWorldException
      at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      ... 71 more

• 原因:Spring AOP 虽然有自己的AOP功能，但是它是依赖AspectJ来实现的。使用maven搭建的项目pom.xml中，没有引入aspectjweaver包。
• 解决办法：在pom.xml中引入aspectjweaver包。

   <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
          <dependency>
              <groupId>org.aspectj</groupId>
              <artifactId>aspectjweaver</artifactId>
              <version>1.9.2</version>
          </dependency>

• 测试成功
  
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