Spring AOP AspectJ Xml Configuration Example

AspectJ libraries provides the facility to declare aspect, pointcut etc using xml file. Let us discuss the syntax first.

Declaring an aspect:

The element is used to declare an aspect. The ref attribute is used for bean reference.

Declaring a pointcut:

The element is used to declare an pointcut. The expression element represents the expression used for matching the join point.

Declaring advices:

The element is used to declare an advice.

Advice types:

Before:
It executes before the method execution.

After:
It executes after the method execution. It not depends upon the method outcome.

after-returning:
It executes after the method execution when method completes successfully.

after-throwing:
It executes after the method execution when method exits by throwing an exception.

Around:
It executes before and after the advised method is called.

Spring AOP AspectJ Xml Configuration Before Advice Example:

BusinessLogic.java

/**
 * This class will be used as a bean class.
 * @author javawithease
 */
public class BusinessLogic {
 public void implementBusinessLogic(){
  System.out.println("Business logic executed.");
 }
}

BeforeAdviceTest.java

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.");  
    }  
}

applicationContext.java

<?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="com.javawithease.business.BusinessLogic"/>
   <bean id="beforeAdviceTest" 
     class="com.javawithease.business.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>

Test.java

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();
 } 
}

Output:

Additional concern before business logic.
Business logic executed.

Download this example.

Spring AOP AspectJ Xml Configuration after-returning Advice Example:

BusinessLogic.java

/**
 * This class will be used as a bean class.
 * @author javawithease
 */
public class BusinessLogic {
 public void implementBusinessLogic(){
  System.out.println("Business logic executed.");
 }
}

AfterReturningAdviceTest.java

import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
 
public class AfterReturningAdviceTest implements AfterReturningAdvice{  
    @Override  
    public void afterReturning(Object returnValue, Method method,  
            Object[] args, Object target)throws Throwable {  
        System.out.println("Additional concern " +
          "after returning business logic.");  
    } 
}

applicationContext.java

<?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="com.javawithease.business.BusinessLogic"/>
   <bean id="afterReturningAdviceTest" 
    class="com.javawithease.business.AfterReturningAdviceTest"/>
   <bean id="proxy" 
    class="org.springframework.aop.framework.ProxyFactoryBean">
 <property name="target" ref="businessLogic"></property>  
 <property name="interceptorNames">  
  <list>  
   <value>afterReturningAdviceTest</value>  
  </list>  
    </property> 
   </bean> 
</beans>

Test.java

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();
 } 
}

Output:

Business logic executed.
Additional concern after returning business logic.

Download this example.

Spring AOP AspectJ Xml Configuration after-throwing Advice Example:

BusinessLogic.java

/**
 * This class will be used as a bean class.
 * @author javawithease
 */
public class BusinessLogic {
 public void implementBusinessLogic(int num){
   if(num == 0){  
        throw new ArithmeticException("Exception occures.");  
    }  
    else{  
        System.out.println("Business logic executed.");  
    }  
 }
}

AfterThrowingAdviceTest.java

import java.lang.reflect.Method;
import org.springframework.aop.ThrowsAdvice;
 
public class AfterThrowingAdviceTest implements ThrowsAdvice{ 
 public void afterThrowing(Method m,Object args[],
   Object target,Exception e) {
  System.out.println("Additional concern after" +
    " throwing exception in business logic.");
 }   
}

applicationContext.java

<?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="com.javawithease.business.BusinessLogic"/>
   <bean id="afterThrowingAdviceTest" 
    class="com.javawithease.business.AfterThrowingAdviceTest"/>
   <bean id="proxy" 
    class="org.springframework.aop.framework.ProxyFactoryBean">  
 <property name="target" ref="businessLogic"></property>  
 <property name="interceptorNames">  
  <list>  
   <value>afterThrowingAdviceTest</value>  
  </list>  
    </property> 
   </bean> 
</beans>

Test.java

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(0);
 } 
}

Output:

Additional concern after throwing exception in business logic.
Exception in thread "main" java.lang.ArithmeticException: Exception occures.
 at com.javawithease.business.BusinessLogic.implementBusinessLogic(BusinessLogic.java:10)
 at com.javawithease.business.BusinessLogic$$FastClassByCGLIB$$19ab96db.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
 at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:692)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
 at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:124)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:625)
 at com.javawithease.business.BusinessLogic$$EnhancerByCGLIB$$b559ac2d.implementBusinessLogic(<generated>)
 at com.javawithease.business.Test.main(Test.java:17)

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