Adding AspectJ to existing project - spring

Question

I am using spring-security project to try out OAuth2 server implementation. I have cloned the git project from https://github.com/SpringSource/spring-security-oauth.
The example is working as documented. Now to trace the flow, I want to add function entry/exit using AOP to existing code. For this I have done following changes:
Added a class "Watcher.java" (code below)
Added AspectJ dependencies in pom.xml
<dependency>
<groupId>aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.5.3</version>
</dependency>
<dependency>
<groupId>aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.5.3</version>
</dependency>
Project builds and runs
But do not see the AspectJ markers for each function
Is it possible to add function entry/exit logging with this method without changing much of the original code?
Watcher.java:
package org.springframework.security.oauth.examples.sparklr;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
#Aspect
public class Watcher {
#Pointcut("execution(* *(..))")
public void watch() {
}
#Before("watch()")
public void preWatch(JoinPoint joinPoint) {
if (joinPoint.getArgs().length > 0) {
String[] args = new String[joinPoint.getArgs().length];
System.arraycopy(joinPoint.getArgs(), 0, args, 0,
joinPoint.getArgs().length);
System.out.println("-> " + joinPoint.toShortString()
+ Arrays.toString(joinPoint.getArgs()));
} else {
System.out.println("-> " + joinPoint.toShortString());
}
System.out.println("Args: " + joinPoint.getArgs().length);
}
#AfterReturning("watch()")
public void postWatch(JoinPoint joinPoint) {
System.out.println("<- " + joinPoint.toShortString());
}
}

Answer 1

You should enable AspectJ in spring configuration (to scan automagically your annotations)
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
xmlns:context="http://www.springframework.org/schema/context"
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
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="..."/>
<aop:aspectj-autoproxy />
...
</beans>
Maybe you will nedd to the spring-aop dependency to your project too.