please help me find the error

[souma]

Good morning,
where is the error please?

package example;

public interface IHelloWorld {
public void helloWorld();
}

package example;

public class HelloWorldImpl implements IHelloWorld {
public void helloWorld() {
System.out.println( "Hello World!");
}

}

package example;

public class Pojo {
public static void main(String[] args) {
Pojo pojo = new Pojo();
((IHelloWorld)pojo).helloWorld();
}
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>






example.IHelloWorld

example.HelloWorldImpl
new example.HelloWorldImpl(this)

[souma]

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>






example.IHelloWorld

example.HelloWorldImpl
new example.HelloWorldImpl(this)

[souma]

Sorry

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<aop>
 <introduction class="example.Pojo">
 <mixin>
 <interfaces>example.IHelloWorld</interfaces>
 <class>example.HelloWorldImpl</class>
 <construction>new example.HelloWorldImpl(this)</construction>
 </mixin>

 </introduction>


</aop>