aspect oriented programming concept in spring in java with adding the jar files externally

Question

Whenever I m running the code attached below I m facing this error....

g4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'proxy': FactoryBean threw exception on object creation; nested exception is java.lang.ExceptionInInitializerError
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:150)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1387)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:244)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1048)
    at Sample.Test.main(Test.java:14)
Caused by: java.lang.ExceptionInInitializerError
    at net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:166)
    at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:116)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)
    at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)
    at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:69)
    at org.springframework.aop.framework.Cglib2AopProxy.createEnhancer(Cglib2AopProxy.java:228)
    at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:170)
    at org.springframework.aop.framework.ProxyFactoryBean.getProxy(ProxyFactoryBean.java:362)
    at org.springframework.aop.framework.ProxyFactoryBean.getSingletonInstance(ProxyFactoryBean.java:316)
    at org.springframework.aop.framework.ProxyFactoryBean.getObject(ProxyFactoryBean.java:242)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:143)
    ... 6 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 @3e92efc3
    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:199)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
    at net.sf.cglib.core.ReflectUtils$2.run(ReflectUtils.java:56)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
    at net.sf.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:46)
    ... 20 more

BeforeAdviceTest.java

package Sample;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class BeforeAdviceTest implements MethodBeforeAdvice {
    @Override  
    public void before(Method method, Object[] args, Object target)throws Throwable {  
        System.out.println("Additional concern " +"before business logic.");  
    }  
}

BuisnessLogic.java

package Sample;

public class BusinessLogic {

    public void implementBusinessLogic(){
        System.out.println("Business logic executed.");
    }
}

Test.java

package Sample;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Test {
 public static void main(String[] args) {
  //Get ApplicationContext using spring configuration file.
  ApplicationContext context = 
    new ClassPathXmlApplicationContext("applicationContext.xml");
 
  //Get BusinessLogic bean object from ApplicationContext instance. 
  BusinessLogic businessLogic = 
    (BusinessLogic) context.getBean("proxy", BusinessLogic.class);
 
  //Call implementBusinessLogic method of BusinessLogic bean.
  businessLogic.implementBusinessLogic();
 } 
}

applicationContext.xml

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

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
   <bean id="businessLogic" 
        class="Sample.BusinessLogic"/>
   <bean id="beforeAdviceTest" 
        class="Sample.BeforeAdviceTest"/>
   <bean id="proxy" 
        class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="target" ref="businessLogic"></property>  
    <property name="interceptorNames">  
     <list>  
      <value>beforeAdviceTest</value>  
     </list>  
    </property> 
   </bean> 
</beans>

Answer 1

Issue is not with AOP, For logging, your using log4j dependency, We needs to do some configuration for log4j. May be configuration missed, Causing these issues