@Override
    protected void merge(Metadata recessive) {
        Versioning original = metadata.getVersioning();

        Versioning.Builder versioning = Versioning.newBuilder(original);
        versioning.lastUpdated(fmt.format(timestamp));

        if (recessive.getVersioning() != null) {
            if (original.getLatest() == null) {
                versioning.latest(recessive.getVersioning().getLatest());
            }

                break;
            default:
                throw new IllegalArgumentException("Bad artifact coordinates " + coord
                        + ", expected format is <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>");
        }
        return s;
    }

        String version = parent.getVersion();

        ModelResolver modelResolver = getModelResolver(request);
        Objects.requireNonNull(
                modelResolver,
                String.format(
                        "request.modelResolver cannot be null (parent POM %s and POM %s)",
                        ModelProblemUtils.toId(groupId, artifactId, version),

            if (versionRangeResult.getHighestVersion() == null) {
                throw new UnresolvableModelException(
                        String.format(
                                "No versions matched the requested parent version range '%s'", parent.getVersion()),
                        parent.getGroupId(),
                        parent.getArtifactId(),

                .collect(toSet());

        if (!notFoundRequiredProfiles.isEmpty()) {
            // Use SLF4J formatter for consistency with warnings reported by logger
            final String message = MessageFormatter.format(
                            "The requested profiles {} could not be activated or deactivated because they do not"
                                    + " exist.",
                            notFoundRequiredProfiles)

        if (sources == null) {
            return null;
        }
        return sources.stream()
                .reduce((a, b) -> {
                    throw new IllegalStateException(String.format(
                            "No unique Source for %s:%s: %s and %s",
                            groupId, artifactId, a.getLocation(), b.getLocation()));
                })
                .orElse(null);
    }

             * If the dependency has no module information, search for an artifact of the same groupId
             * and artifactId. If one is found, we are patching that module. If none is found, add the
             * dependency as a normal dependency.
             */
            if (type == null) {
                Path main = findArtifactPath(dep.getGroupId(), dep.getArtifactId());
                if (main != null) {

             * If the dependency has no module information, search for an artifact of the same groupId
             * and artifactId. If one is found, we are patching that module. If none is found, add the
             * dependency as a normal dependency.
             */
            if (type == null) {
                Path main = findArtifactPath(dep.getGroupId(), dep.getArtifactId());
                if (main != null) {

 */
public class MavenBuildTimestamp {
    // ISO 8601-compliant timestamp for machine readability
    public static final String DEFAULT_BUILD_TIMESTAMP_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";

    public static final String BUILD_TIMESTAMP_FORMAT_PROPERTY = "maven.build.timestamp.format";

    public static final TimeZone DEFAULT_BUILD_TIME_ZONE = TimeZone.getTimeZone("Etc/UTC");

    private String formattedTimestamp;

     */
    @Nonnull
    @Override
    public String option(Iterable<? extends Path> paths) {
        return format(null, paths);
    }

    /**
     * Implementation shared with {@link Modular}.
     */
    String format(String moduleName, Iterable<? extends Path> paths) {
        if (option == null) {
            throw new IllegalStateException("No option is associated to this path type.");
        }