Spring Auto Proxy Bean – DefaultAdvisorAutoProxyCreator

A more general and extremely powerful auto proxy creator is DefaultAdvisorAutoProxyCreator. This will automagically apply eligible advisors in the current context, without the need to include specific bean names in the autoproxy advisor’s bean definition. It offers the same merit of consistent configuration and avoidance of duplication as BeanNameAutoProxyCreator.

The DefaultAdvisorAutoProxyCreator will automatically evaluate the pointcut contained in each advisor, to see what (if any) advice it should apply to each business object (such as “businessObject1″ and “businessObject2″ in the example).

First create a new Java Project and configure it as Maven Project. For Reference, Click Here

Add the following dependencies in pom.xml

    <!-- Proxy class need this library -->

1. Business Logic and Implementation

We will first write our business logic and then we will add Spring AOP to profile our business methods.

Create an interface BusinessService and write a following method. We will intercept this via Advice


package com.kruders.spring.aop;
public interface BusinessService {
    void doSomeThing();

Now create a class BusinessImpl.java that implements the above interface.


package com.kruders.spring.aop;
import org.springframework.stereotype.Service;
public class BusinessImpl implements BusinessService {
    public void doSomeThing() {
        System.out.println("Do Something Here");

2. Configure Spring AOP

Create Spring-Business.xml and write the following code


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

	<bean id="businessService" class="com.kruders.spring.aop.BusinessImpl" />
    <!-- Advice -->
    <bean id="businessAdvice" class="com.kruders.spring.advice.BusinessAdvice" />
    <bean id="businessAdvisor"
		<property name="mappedName" value="doSomeThing" />
		<property name="advice" ref="businessAdvice" />
   <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator" />

3. Advice Class

Now write a Advice which will profile our business method.


package com.kruders.spring.advice;

import java.util.Arrays;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

public class BusinessAdvice implements MethodInterceptor {
	public Object invoke(MethodInvocation method) throws Throwable {
		System.out.println("Method name : " + method.getMethod().getName());
		System.out.println("Method arguments : " + Arrays.toString(method.getArguments()));
		System.out.println("Around method is called");
	    System.out.println("Around before is running");
		System.out.println("Around after is running");
		return null;

4. Helper Class

Create Main.java class that loads our Business bean from Spring Context and then calling our business method.


package com.kruders.spring.core;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.kruders.spring.aop.BusinessService;

public class Main {
	public static void main(String args[]) {
        ApplicationContext appContext = new ClassPathXmlApplicationContext("Spring-Business.xml");
        BusinessService businessService = (BusinessService)appContext.getBean("businessService");

5. Output

When you run the above example you’ll get an output like:

Method name : doSomeThing
Method arguments : []
Around method is called
Around before is running
Do Something Here
Around after is running

The folder structure of the example is shown below in Figure 21.1

Figure 21.1 Figure 21.1

You can download the source code of this example here.

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