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Spring AOP - AspectJ - @AfterThrowing example


Last few pages talked about spring advices (before advice, after return advice, around advice and pointcut examples). In this page you will get an idea about how to integrate AspectJ annotations with Spring AOP framework. Using spring AOP and AspectJ, you can easily intercept methods.

AspectJ comes with below annotations:

1) @Before
2) @After
3) @AfterReturning
4) @AfterThrowing
5) @Around

In this page we will see an example for @AfterThrowing annotation. @AfterThrowing annotation intercepts method after throwing any exception

pom.xml file gives all required dependencies: Add dependencies for spring-aop jar, aspectjrt jar and aspectjweaver jar file.

<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
	http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>SpringJavaBasedConfig</groupId>
	<artifactId>SpringJavaBasedConfig</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<spring.version>3.2.0.RELEASE</spring.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>1.8.0</version>
		</dependency>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.0</version>
		</dependency>
		<dependency>
			<groupId>cglib</groupId>
			<artifactId>cglib</artifactId>
			<version>3.1</version>
		</dependency>
		
	</dependencies>
</project>

My business logic service class:

package com.java2novice.bean;

public class MyBusinessService {

	public String runMyBusinessLogic(){
		System.out.println("************************************");
		System.out.println("Running business logic...");
		System.out.println("************************************");
		
		return "Successfully executed my business logic";
	}
	
	public void testThrowException() {
		throw new NullPointerException();
	}
}

Here is the Aspect class example. The afterThrowing() method will be executed after any exception got throwed. Note here you have specified "throwing" attribute as part of your annotation. Make sure that the annotation throwing attribute value should be same as method input parameter.

package com.java2novice.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.aop.ThrowsAdvice;

@Aspect
public class CatchThrowException implements ThrowsAdvice{

	@AfterThrowing(
	pointcut="execution(* com.java2novice.bean.MyBusinessService.testThrowException(..))", 
	throwing="excep")
	public void afterThrowing(JoinPoint joinPoint, Throwable excep) throws Throwable {
		System.out.println("Inside CatchThrowException.afterThrowing() method...");
		System.out.println("Running after throwing exception...");
		System.out.println("Exception : " + excep);
	}
}

Here is the xml based configuration file. By adding "<aop:aspectj-autoproxy />" tag, you can enable AspectJ with in your application. Add bean definitions for your normal bean and your Aspect.

<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-3.0.xsd
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
	
    <aop:aspectj-autoproxy />
    
    <bean id="busService" class="com.java2novice.bean.MyBusinessService" />
	<bean id="afterThrowAspectBean" class="com.java2novice.aop.CatchThrowException" />
 </beans>

Here is the final demo class:

package com.java2novice.test;

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

import com.java2novice.bean.MyBusinessService;

public class SpringDemo {

	public static void main(String a[]){

		String confFile = "applicationContext.xml";
		ConfigurableApplicationContext context = 
							new ClassPathXmlApplicationContext(confFile);
		MyBusinessService busServ = (MyBusinessService) context.getBean("busService");
		try{
			busServ.testThrowException();
		} catch(Exception ex){
			
		}
	}
}

Next page shows an example for spring aop - AspectJ - @Around example.


Output:
Inside CatchThrowException.afterThrowing() method...
Running after throwing exception...
Exception : java.lang.NullPointerException
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Byte Streams: Provide a convenient means for handling input and output of bytes. Byte Streams classes are defined by using two abstract classes, namely InputStream and OutputStream.

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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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