private static final String PREFIX_PROJECT = "project.";
    private static final String PREFIX_POM = "pom.";
    private static final List<String> PROJECT_PREFIXES_3_1 = Arrays.asList(PREFIX_POM, PREFIX_PROJECT);
    private static final List<String> PROJECT_PREFIXES_4_0 = Collections.singletonList(PREFIX_PROJECT);

    private static final Collection<String> TRANSLATED_PATH_EXPRESSIONS;

    static {

      return service;
    }

    final ScheduledExecutorService getExitingScheduledExecutorService(
        ScheduledThreadPoolExecutor executor) {
      return getExitingScheduledExecutorService(executor, 120, TimeUnit.SECONDS);
    }

    final void addDelayedShutdownHook(
        final ExecutorService service, final long terminationTimeout, final TimeUnit timeUnit) {
      checkNotNull(service);

    private final ExtensionRealmCache extensionRealmCache;
    private final PluginVersionResolver pluginVersionResolver;
    private final PluginArtifactsCache pluginArtifactsCache;
    private final MavenPluginValidator pluginValidator;
    private final List<MavenPluginConfigurationValidator> configurationValidators;
    private final PluginValidationManager pluginValidationManager;

    private final Object[] columnKeys;

    private final Object[] cellValues;
    private final int[] cellRowIndices;
    private final int[] cellColumnIndices;

    private SerializedForm(
        Object[] rowKeys,
        Object[] columnKeys,
        Object[] cellValues,
        int[] cellRowIndices,
        int[] cellColumnIndices) {
      this.rowKeys = rowKeys;
      this.columnKeys = columnKeys;

    return new OrderedPermutationCollection<E>(elements, comparator);
  }

  private static final class OrderedPermutationCollection<E> extends AbstractCollection<List<E>> {
    final ImmutableList<E> inputList;
    final Comparator<? super E> comparator;
    final int size;

    OrderedPermutationCollection(Iterable<E> input, Comparator<? super E> comparator) {

    }

    private static final Pattern UNIX_PID_PATTERN = Pattern.compile("([0-9]+)");
    private static final Pattern WINDOWS_PID_PATTERN = Pattern.compile("([0-9]+)\\s*$");
    private static final String MY_PID = String.valueOf(ProcessHandle.current().pid());
    private static final String JAVA_EXECUTABLE_PATTERN_STR = "java(?:\\.exe)?";
    private static final String GRADLE_MAIN_CLASS_PATTERN_STR = "(org\\.gradle\\.[a-zA-Z]+)";

    EMPTY_GENERATORS = builder.buildOrThrow();
  }

  private final AtomicInteger freshness = new AtomicInteger(1);
  private final ListMultimap<Class<?>, Object> sampleInstances = ArrayListMultimap.create();

  /**
   * The freshness level at which the {@link Empty @Empty} annotated method was invoked to generate
   * instance.
   */
  private final Map<Type, Integer> emptyInstanceGenerated = new HashMap<>();

class ReactorReader implements MavenWorkspaceReader {
    public static final String HINT = "reactor";

    public static final String PROJECT_LOCAL_REPO = "project-local-repo";

    private static final Collection<String> COMPILE_PHASE_TYPES = new HashSet<>(
            Arrays.asList("jar", "ejb-client", "war", "rar", "ejb3", "par", "sar", "wsr", "har", "app-client"));

    private static final Logger LOGGER = LoggerFactory.getLogger(ReactorReader.class);

    return new Builder<>(Ordering.natural());
  }

  /**
   * A builder for creating immutable sorted set instances, especially {@code public static final}
   * sets ("constant sets"), with a given comparator. Example:
   *
   * <pre>{@code
   * public static final ImmutableSortedSet<Number> LUCKY_NUMBERS =
   *     new ImmutableSortedSet.Builder<Number>(ODDS_FIRST_COMPARATOR)
   *         .addAll(SINGLE_DIGIT_PRIMES)

    return new Builder<>(expectedSize);
  }

  /**
   * A builder for creating immutable bimap instances, especially {@code public static final} bimaps
   * ("constant bimaps"). Example:
   *
   * <pre>{@code
   * static final ImmutableBiMap<String, Integer> WORD_TO_INT =
   *     new ImmutableBiMap.Builder<String, Integer>()
   *         .put("one", 1)
   *         .put("two", 2)