Throws an Exception when I add `<aop:before>` to beans.xml - spring

Question

This is my Main.java
import org.springframework.context.*;
import org.springframework.context.support.*;
public class Main{
public static void main(String args[]) {
ApplicationContext context =
new ClassPathXmlApplicationContext("./beans.xml");
Cat cat = (Cat) context.getBean("cat");
cat.sleep();
}
}
class Cat{
public void sleep(){
System.out.println("cat is sleeping.");
}
}
class Timer{
public void begain(){
System.out.println(System.currentTimeMillis());
}
public void stop(){
System.out.println(System.currentTimeMillis());
}
}
and this is my beans.xml for ApplicationContext.
<!-- omit some links -->
<beans>
<bean id="cat" class="Cat"></bean>
<bean id="t1" class="Timer"></bean>
<aop:config>
<aop:aspect ref="t1">
<aop:pointcut id="cat_sleep"
expression="execution(* *.sleep(..))" />
<aop:before
pointcut-ref="cat_sleep"
method="begain" />
</aop:aspect>
</aop:config>
</beans>
I want to call Timer_Instance.begain before Cat_Instance.sleep,
But when I try to exxcute this code, it thrown a very long exception, I no idea about this.
Feb 28, 2019 4:34:58 PM org.springframework.context.support.AbstractApplicationContext refresh
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cat' defined in class path resource [beans.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#5b1669c0' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5b1669c0': Resolution of declared constructors on bean Class [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#1de0aca6] failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/JoinPoint
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cat' defined in class path resource [beans.xml]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#5b1669c0' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5b1669c0': Resolution of declared constructors on bean Class [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#1de0aca6] failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/JoinPoint
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at Main.main(Main.java:6)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.aspectj.AspectJPointcutAdvisor#0': Cannot create inner bean '(inner bean)#5b1669c0' of type [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5b1669c0': Resolution of declared constructors on bean Class [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#1de0aca6] failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/JoinPoint
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:327)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:131)
at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:676)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:188)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1325)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1171)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204)
at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:91)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:109)
at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:251)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1108)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1081)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:504)
... 10 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#5b1669c0': Resolution of declared constructors on bean Class [org.springframework.aop.aspectj.AspectJMethodBeforeAdvice] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#1de0aca6] failed; nested exception is java.lang.NoClassDefFoundError: org/aspectj/lang/JoinPoint
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:159)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1325)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1171)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:312)
... 28 more
Caused by: java.lang.NoClassDefFoundError: org/aspectj/lang/JoinPoint
at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3090)
at java.base/java.lang.Class.getDeclaredConstructors(Class.java:2316)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:154)
... 33 more
Caused by: java.lang.ClassNotFoundException: org.aspectj.lang.JoinPoint
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
... 37 more
But if I delete aop.before form beans.xml, the code will be fine.
<beans>
<bean id="cat" class="Cat"></bean>
<bean id="t1" class="Timer"></bean>
<aop:config>
<aop:aspect ref="t1">
<aop:pointcut id="cat_sleep"
expression="execution(* *.sleep(..))" />
<!--<aop:before
pointcut-ref="cat_sleep"
method="begain" />-->
</aop:aspect>
</aop:config>
</beans>
I was really confused, I am following a book about spring, I can not find some problem with my beans.xml.
I am using Spring-5.1.5.

Answer 1

Yeah, #M.Deinum
I miss two dependencies of Spring. I should download them from
https://mvnrepository.com/artifact/org.aspectj/aspectjweaver/1.9.2
https://mvnrepository.com/artifact/org.aspectj/aspectjrt/1.9.2
and add these to my classpath.