throw new IllegalStateException("No version present")
        }
        def m = version.toString() =~ CLASSIFIER_PATTERN
        VersionNumber.parse(m[0][1])
    }

    @Nullable
    static String getVersionClassifier() {
        if (version == null) {
            throw new IllegalStateException("No version present")
        }
        def m = version.toString() =~ CLASSIFIER_PATTERN
        return m[0][2]
    }