In class org.onap.sdnc.config.params.transformer.ArtificatTransformer
This method will always return null
public String convertPdToParams(PropertyDefinition propertyDefinition)
throws JsonParseException, JsonMappingException, IOException {
String paramJson = null;
if (propertyDefinition != null && propertyDefinition.getParameters() != null)

{ List<Parameter> parameters = propertyDefinition.getParameters(); }

return paramJson;
}

This method is also called from convertYAMLToParams method in the same class which will also always return null as a consequence.