How run aspect in Spring without xml?

Question

How to run an aspect in Java.

How to run an aspect in Spring using annotations, without xml file?

Many other tutorials using xml file for configuration ascpect.

Answer 1

Define a custom annotation;

@Target({ElementType.TYPE ,ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Loggable {

}

Annotate your method that you want to intercept ;

@Service
public class MyAwesomeService {

    @Loggable
    public void myAwesomemethod(String someParam) throws Exception {
        // do some awesome things.
    }
}

Add aspect dependencies to your pom.

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aop</artifactId>
</dependency>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
</dependency>

and define your aspects class ;

@Aspect
@Component
public class LoggingHandler {

     @Before("@annotation(com.example.annotation.Loggable)")
     public void beforeLogging(JoinPoint joinPoint){
         System.out.println("Before running loggingAdvice on method=");

    }

    @After("@annotation(com.example.annotation.Loggable)")
    public void afterLogging(JoinPoint joinPoint){
        System.out.println("After running loggingAdvice on method=");
    }
}

Answer 2

Use annotations on your class: @Component @Aspect