for (String conf : artifact.getConfigurations()) {
                    if (getMd().getConfiguration(conf) == null) {
                        throw new IllegalArgumentException("Artifact " + artifact.getArtifactName().getDisplayName() + " is mapped to configuration '" + conf + "' which is not declared.");
                    }
                }
            }
        }

        private void maybeAddDefaultArtifact() {