if (jdk == null) {
            return false;
        }

        String version = context.getSystemProperties().get("java.version");

        if (version == null || version.isEmpty()) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("Failed to determine Java version for profile " + profile.getId())

            Model target,
            List<? extends DependencyManagement> sources,
            ModelBuilderRequest request,
            ModelProblemCollector problems) {
        if (sources != null && !sources.isEmpty()) {
            Map<String, Dependency> dependencies = new LinkedHashMap<>();

            DependencyManagement depMgmt = target.getDependencyManagement();

            if (depMgmt != null) {

     *
     * So {@code (b : c).plus(a) == (a : b : c)}
     */
    @CheckReturnValue
    public abstract PersistentList<T> plus(T element);

    public abstract boolean isEmpty();

    private PersistentList() {}

    private static final PersistentList<Object> NIL = new PersistentList<Object>() {
        @Override
        public void forEach(Consumer<? super Object> consumer) {
        }

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {
            LinkedHashMap<String, Plugin> mergedPlugins = new LinkedHashMap<>();
            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));

    @Override
    public FileCollectionFingerprint read(Decoder decoder) throws IOException {
        Map<String, FileSystemLocationFingerprint> fingerprints = fingerprintMapSerializer.read(decoder);
        if (fingerprints.isEmpty()) {
            return FileCollectionFingerprint.EMPTY;
        }
        ImmutableMultimap<String, HashCode> rootHashes = readRootHashes(decoder);
        HashCode strategyConfigurationHash = hashCodeSerializer.read(decoder);

        StringBuilder sb = new StringBuilder();
        if (!inclusions.isEmpty()) {
            sb.append("(");
            sb.append(join(inclusions, " OR "));
            sb.append(")");
            if (!exclusions.isEmpty()) {
                sb.append(" AND ");
            }
        }
        if (!exclusions.isEmpty()) {
            sb.append("NOT (");
            sb.append(join(exclusions, " OR "));

    ) {
        if (!spec.getComponentFilter().isSatisfiedBy(componentId)) {
            return ResolvedArtifactSet.EMPTY;
        } else {

            if (spec.getSelectFromAllVariants() && !artifacts.isEmpty()) {
                // Variants with overridden artifacts cannot be reselected since
                // we do not know the "true" attributes of the requested artifact.
                return ResolvedArtifactSet.EMPTY;

                Integer depth = usages.remove(Thread.currentThread());
                if (depth > 1) {
                    usages.put(Thread.currentThread(), depth - 1);
                }
                if (usages.isEmpty()) {
                    condition.signalAll();
                    if (state == State.STOPPING) {
                        state = State.STOPPED;
                    }
                }
            } finally {

            classpath.addAll(workerMainClassPath);
        }
        modulePath.addAll(applicationModulePath);
        classpath.addAll(applicationClasspath);

        if (!modulePath.isEmpty() && implementationModulePath != null && !implementationModulePath.isEmpty()) {
            // We add the implementation module path as well, as we do not load modules dynamically through a separate class loader in the worker.

    Optional<Object> getOptional() {
      if (extras.isEmpty()) {
        return Optional.ofNullable(element);
      } else {
        throw multiples(false);
      }
    }

    Object getElement() {
      if (element == null) {
        throw new NoSuchElementException();
      } else if (extras.isEmpty()) {
        return element;
      } else {
        throw multiples(false);