@Override
    public Reader getServices() {
        try {
            return new FileReader(getServicesSource());
        } catch (Exception e) {
            throw new IllegalArgumentException(e);
        }
    }
Creates a reader for a config definition

@param defPath the path to the application package
@return the reader of this config definition
config-application-package/src/main/java/com/yahoo/config/model/application/provider/FilesApplicationPackage.java