```groovy
public interface ExistingThing {
    String getOtherProperty()
    void setOtherProperty(String s)

    Property<String> getSomeProperty()
}

abstract class DefaultExistingThing implements ExistingThing {
    private String otherProperty
    public String getOtherProperty() ...
    public void setOtherProperty(String s) ...

    // NOTE: No direct implementation of getSomeProperty
}
```