Can a service-layer object "service" a DAO-layer object?
<p>Can a service-layer object "service" a DAO-layer object? Or is does this violate the integrity of a properly layered architecture?</p>

<p>e.g.,</p>

<pre><code>class MyService {

}

class MyDao {
     private MyService myService;
}
</code></pre>
