<div dir="ltr" style="text-align: justify;">
<p>In this spring aop after advice example, we will discuss how to use aspectj @After annotation with java configuration in the application. In Spring AOP After Advice is that executes just after a join point i.e a method which annotated with AspectJ @After annotation run just after the all methods matching with pointcut expression. But After Advice does not have the ability to prevent execution flow proceeding to the join point.</p>
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<h2><b>Download Application Source Code</b><br />
<b><br />
</b> <a href="https://github.com/DOJ-SoftwareConsultant/SpringAOP-After-Advice-Annotation" target="_blank" rel="noopener"><b>Spring AOP AspectJ @After Annotation Advice Example on GitHub.</b></a></h2>
<p>Let&#8217;s create a simple spring application and add logging aspect to be invoked every joint point in the service class in the application. In this example, We will create simple spring application, add logging aspect and then invoke aspect methods based on pointcuts information passed in @After annotation. This example is also available with XML configuration in the application <a href="https://dineshonjava.com/spring-aop-after-advice-example-using-xml-config/"><b>Spring AOP After Advice Example</b></a>.</p>
<h2><b>AspectJ @After Annotation</b></h2>
<p><b>@After</b> annotation is not a spring annotation, it is aspectj lib annotation so we have to add aspectj maven dependency with spring aop in this example. Let&#8217;s see our <b>LoggingAspect </b>class with after advice annotation.</p>
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<pre class="highlight">/** 
 * 
 */ 
package com.doj.aopapp.aspect; 
 
import org.aspectj.lang.JoinPoint; 
import org.aspectj.lang.annotation.After; 
import org.aspectj.lang.annotation.Aspect; 
import org.aspectj.lang.annotation.Pointcut; 
import org.springframework.stereotype.Component; 
 
/** 
 * @author Dinesh.Rajput 
 * 
 */ 
@Aspect 
@Component 
public class LoggingAspect { 
 
 /** 
 * Declaring before advice 
 * @param jp 
 * @throws Throwable 
 */ 
 //@After("execution(* com.doj.aopapp.service.*.*(..))") // after advice with pointcut expression directly 
 @After("logForAllMethods()") //after advice with name pointcut that declared as name logForAllMethods() 
 public void afterAdviceForAllMethods(JoinPoint jp) throws Throwable { 
 System.out.println("****LoggingAspect.afterAdviceForAllMethods() " + jp.getSignature().getName()); 
 } 
 
 /** 
 * Declaring after advice for all transfer methods whose taking three arguments of any type 
 * of all classes in the package com.doj.aopapp.service 
 * @param jp 
 * @throws Throwable 
 */ 
 @After("execution(* com.doj.aopapp.service.*.transfer(*,*,*))") 
 public void afterAdviceForTransferMethods(JoinPoint jp) throws Throwable { 
 System.out.println("****LoggingAspect.afterAdviceForTransferMethods() " + jp.getSignature().getName()); 
 } 
 
 /** 
 * Declaring named pointcut 
 */ 
 @Pointcut("execution(* com.doj.aopapp.service.*.*(..))") 
 public void logForAllMethods(){} 
} 
 
</pre>
<h3><b>Declaring Pointcut expressions</b></h3>
<p><b>#1.</b> In the First pointcut expression, we have declared for after advice, it is valid for all public methods with any number arguments of any type and any return type, for all classes in the com.doj.aopapp.service package.</p>
<pre class="highlight">@After("execution(* com.doj.aopapp.service.*.*(..))") 
</pre>
<p><b>#2.</b> In the Second pointcut expression, we have declared for after advice, it is valid for all public methods whose name is transfer() with taking three arguments of any type and any return type, for all classes in the com.doj.aopapp.service package.</p>
<pre class="highlight">@After("execution(* com.doj.aopapp.service.*.transfer(*,*,*))") 
</pre>
<p><b>#3. Named Pointcut</b></p>
<pre class="highlight">/** 
 * Declaring named pointcut 
 */ 
@Pointcut("execution(* com.doj.aopapp.service.*.*(..))") 
public void logForAllMethods(){} 
 
@After("logForAllMethods()") //after advice with name pointcut that declared as name logForAllMethods() 
public void afterAdviceForAllMethods(JoinPoint jp) throws Throwable { 
 System.out.println("****LoggingAspect.afterAdviceForAllMethods() " + jp.getSignature().getName()); 
} 
</pre>
<p>As above we could also declare named pointcut for complex and repetitive pointcut expressions in the application.</p>
<h2><b>Spring AOP AspectJ @After Annotation Example</b></h2>
<p>Now let&#8217;s see complete example of Spring AOP aspectj @After annotation.</p>
<h3><b>Spring AOP and AspectJ Maven Dependencies</b></h3>
<pre class="highlight"><;properties>; 
 <;spring.version>;4.3.7.RELEASE<;/spring.version>; 
 <;aspectj.version>;1.8.9<;/aspectj.version>; 
 <;/properties>; 
 
 <;dependencies>; 
 <;dependency>; 
 <;groupId>;org.springframework<;/groupId>; 
 <;artifactId>;spring-context<;/artifactId>; 
 <;version>;${spring.version}<;/version>; 
 <;/dependency>; 
 <;dependency>; 
 <;groupId>;org.springframework<;/groupId>; 
 <;artifactId>;spring-context-support<;/artifactId>; 
 <;version>;${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>;${aspectj.version}<;/version>; 
 <;/dependency>; 
 <;dependency>; 
 <;groupId>;org.aspectj<;/groupId>; 
 <;artifactId>;aspectjweaver<;/artifactId>; 
 <;version>;${aspectj.version}<;/version>; 
 <;/dependency>; 
 <;/dependencies>; 
</pre>
<h3><b>ApplicationContext Configuration file based on Java Config </b></h3>
<p><b>AppConfig.java</b></p>
<pre class="highlight">/** 
 * 
 */ 
package com.doj.aopapp.config; 
 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.context.annotation.EnableAspectJAutoProxy; 
 
/** 
 * @author Dinesh.Rajput 
 * 
 */ 
@Configuration 
@EnableAspectJAutoProxy 
@ComponentScan(basePackages={"com.doj.aopapp.aspect", "com.doj.aopapp.service"}) 
public class AppConfig { 
 
} 
</pre>
<p><b>#1. @EnableAspectJAutoProxy Annotation of Spring AOP:</b><br />
Spring AOP provides an annotation to enable @AspectJ support in the application. By default spring framework doesn&#8217;t create any proxy for any advice, so we have enable by using this annotation. In the java configuration we can use this annotation as below in the java configuration file.</p>
<pre class="highlight">@Configuration 
@EnableAspectJAutoProxy 
public class AppConfig { 
 
} 
</pre>
<p><b>#2. Enabling @AspectJ Support with XML Configuration:</b><br />
But in the XML configuration, we have to use namespace which is equivalent to <b>@EnableAspectJAutoProxy</b> annotation to enable <b>@AspectJ</b> support in the application. Let&#8217;s see how to use this namespace <b><;aop:aspectj-autoproxy/>;</b>.</p>
<pre class="highlight"><;!-- Enable @AspectJ annotation support -->; 
 <;aop:aspectj-autoproxy />; 
</pre>
<p><b>Target method of Service class on which aspects needs to apply</b></p>
<p><b>TransferService.java</b></p>
<pre class="highlight">/** 
 * 
 */ 
package com.doj.aopapp.service; 
 
/** 
 * @author Dinesh.Rajput 
 * 
 */ 
public interface TransferService { 
 
 void transfer(String accountA, String accountB, Long amount); 
 
 Double checkBalance(String account); 
 
 Long withdrawal(String account, Long amount); 
 
 void diposite(String account, Long amount); 
} 
 
</pre>
<p><b>TransferServiceImpl.java</b></p>
<pre class="highlight">/** 
 * 
 */ 
package com.doj.aopapp.service; 
 
import org.springframework.stereotype.Service; 
 
/** 
 * @author Dinesh.Rajput 
 * 
 */ 
@Service 
public class TransferServiceImpl implements TransferService { 
 
 @Override 
 public void transfer(String accountA, String accountB, Long amount) { 
 System.out.println(amount+" Amount has been tranfered from "+accountA+" to "+accountB); 
 } 
 
 @Override 
 public Double checkBalance(String account) { 
 System.out.println("Available balance: 50000"); 
 return new Double(50000); 
 } 
 
 @Override 
 public Long withdrawal(String account, Long amount) { 
 System.out.println("Withdrawal amount: " +amount); 
 return amount; 
 } 
 
 @Override 
 public void diposite(String account, Long amount) { 
 System.out.println(amount+" Amount has been diposited to "+account); 
 } 
 
} 
</pre>
<p><b>Aspect class:</b><br />
LoggingAspect.java as given above in this tutorial.</p>
<p><b>Test Class for Spring AspectJ Configuration and Execution</b></p>
<p>Let&#8217;s execute following test class and analyse the output on the console.</p>
<pre class="highlight">/** 
 * 
 */ 
package com.doj.aopapp.test; 
 
import org.springframework.context.ConfigurableApplicationContext; 
import org.springframework.context.annotation.AnnotationConfigApplicationContext; 
 
import com.doj.aopapp.config.AppConfig; 
import com.doj.aopapp.service.TransferService; 
 
/** 
 * @author Dinesh.Rajput 
 * 
 */ 
public class Main { 
 
 /** 
 * @param args 
 */ 
 public static void main(String[] args) { 
 ConfigurableApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class); 
 TransferService transferService = applicationContext.getBean(TransferService.class); 
 transferService.transfer("accountA", "accountB", 50000l); 
 transferService.checkBalance("accountA"); 
 transferService.diposite("accountA", 50000l); 
 transferService.withdrawal("accountB", 40000l); 
 applicationContext.close(); 
 } 
 
} 
 
</pre>
<h2><b><br />
</b> <b>Output on the Console:</b></h2>
<div style="background-color: #f2f9fc; border-radius: 3px; border: 1px solid #c9e6f2; line-height: 1.45; padding: 16px;">Mar 08, 2017 7:52:49 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh<br />
INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@6576fe71: startup date [Wed Mar 08 19:52:49 IST 2017]; root of context hierarchy<br />
50000 Amount has been tranfered from accountA to accountB<br />
****LoggingAspect.afterAdviceForAllMethods() transfer<br />
****LoggingAspect.afterAdviceForTransferMethods() transfer<br />
Available balance: 50000<br />
****LoggingAspect.afterAdviceForAllMethods() checkBalance<br />
50000 Amount has been diposited to accountA<br />
****LoggingAspect.afterAdviceForAllMethods() diposite<br />
Withdrawal amount: 40000<br />
****LoggingAspect.afterAdviceForAllMethods() withdrawal<br />
Mar 08, 2017 7:52:50 PM org.springframework.context.annotation.AnnotationConfigApplicationContext doClose<br />
INFO: Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@6576fe71: startup date [Wed Mar 08 19:52:49 IST 2017]; root of context hierarchy</div>
<p>As output of above console logs, every log messages has been executed just after target method execution.<br />
<b></b></p>
<h2><b><br />
</b> <b>Project Structure</b></h2>
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<p> ;</p>
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