g++: -l[some]: linker input file unused because linking not done

public interface IHelloWorld {

void sayHello();

}

public class HelloWorldImpl implements IHelloWorld {

public void sayHello() {
System.out.println("Hello World!!");
}

}

public class HelloWorldHandler implements InvocationHandler {

IHelloWorld object;

public HelloWorldHandler(IHelloWorld object) {
this.object = object;
}

public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
System.out.println("before");
Object o = method.invoke(object, args);
System.out.println("after");
return o;
}

}

public class proxyDemo {

public static void main(String[] args) {
InvocationHandler handler = new HelloWorldHandler(new HelloWorldImpl());
IHelloWorld proxy = (IHelloWorld)Proxy.newProxyInstance(
HelloWorldImpl.class.getClassLoader(),
HelloWorldImpl.class.getInterfaces(),
handler);
proxy.sayHello();
}

}