Objects within the configuration follow the JavaBean/pojo convention. So in this case:
public class com.mavenrules.utf8validator.UTF8Rule {
private List<String> listOfPaths; // or String[]
}
This should already be enough, but is a bit useless. By adding a getter and setter you should be fine. If I call correctly some versions have trouble initiating the List or array, but that's sothing you can do yourself as well.