Can't get the aspect executed for proxy objects

I am trying to execute a aspect on proxy object

package thispkg;

public class MyLogger {
    public void before() {
        System.out.println("=========Before========");
    }
    public void after() {
        System.out.println("=========After=========");
    }
    public void info() {
        System.out.println("=========Info=========");
    }
}

package thispkg;

public interface MyInterface {
    public void speak();
}

package thispkg;

public class MyInterfaceImpl implements MyInterface {
    @Override
    public void speak() {
        System.out.println("MyInterfaceImpl :: Hello world");
    }
}

package thispkg;

public class RandomClass {
    public void suvichar() {
        System.out.println("RandomClass (suvichar)::Karm kiye jaa, fal ki chinta mat kar");
    }
}

package thispkg;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("thispkg.xml");
        MyInterface in = (MyInterface) context.getBean("randomClass", RandomClass.class);
        in.speak();
    }
}

My XML

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       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 
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:spring-configured/>
    <bean id="mylogger" class="thispkg.MyLogger"/>
    <bean id="randomClass" class="thispkg.RandomClass"/>
    <bean id="myInterfaceImpl" class="thispkg.MyInterfaceImpl"/>
    <aop:config proxy-target-class="true">
        <aop:aspect id="usageTrackerAspect" ref="mylogger">
            <aop:declare-parents types-matching="thispkg.RandomClass+" implement-interface="thispkg.MyInterface" default-impl="thispkg.MyInterfaceImpl"/>
            <aop:pointcut expression="this(thispkg.MyInterface)" id="randompointcut"/>
            <aop:before pointcut-ref="randompointcut" method="info"/>
        </aop:aspect>
    </aop:config>
</beans>

I have tried both thispkg.MyInterfaceImpl & thispkg.RandomClass in pointcut expression but still can't get the ========Info======== printed. Only prints

MyInterfaceImpl :: Hello world

Any clue ?