Spring AOP PointCut Not working

************MyAspect.java*************
package com.mkyong.aspect;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

@Aspect
public class MyAspect {

    @Before("checkMyDetails()")
    public void myLogging() throws Throwable {
        System.out.println("Logger added successfully");

    }

    @Pointcut("within(com.mkyong.customer.bo.*)")
    public void checkMyDetails() {}

}

**********************************************************
MyTest.java

package com.mkyong.customer.bo;

public interface MyTest {
    void addMe(String s);
}
*******************************************************
MyTestImpl.java

package com.mkyong.customer.bo.impl;

import com.mkyong.customer.bo.MyTest;

public class MyTestImpl implements MyTest {

    public void addMe(String s) {
        System.out.println("I had added the " + s + "  person");

    }

}

*********************************************************************************
Spring-Customer.xml

<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
    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="customerBo" class="com.mkyong.customer.bo.impl.CustomerBoImpl" />

    <!-- Aspect -->
    <bean id="logAspect" class="com.mkyong.aspect.LoggingAspect" />

</beans>

***************************************************************************************

App.java

package com.mkyong.core;

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

import com.mkyong.customer.bo.MyTest;

public class App {
    public static void main(String[] args) throws Exception {

        ApplicationContext appContext = new ClassPathXmlApplicationContext("common-files.xml");

        MyTest testing = (MyTest) appContext.getBean("testBo");

        testing.addMe("Srinu");

    }
}