public PersistedToolchains build(File userToolchainsFile) throws MisconfiguredToolchainException {
        PersistedToolchains toolchains = null;

        if (userToolchainsFile != null && userToolchainsFile.isFile()) {
            try (InputStream in = Files.newInputStream(userToolchainsFile.toPath())) {

    @Nonnull
    static ModelSource fromPath(@Nonnull Path path) {
        return fromPath(path, null);
    }

    @Nonnull
    static ModelSource fromPath(@Nonnull Path path, @Nullable String location) {
        return new PathSource(nonNull(path, "path cannot be null"), location);
    }

      } // else no check necessary, all index values are valid
      ArrayReference<? extends L> existingRef = locks.get(index);
      L existing = existingRef == null ? null : existingRef.get();
      if (existing != null) {
        return existing;
      }
      L created = supplier.get();
      ArrayReference<L> newRef = new ArrayReference<>(created, index, queue);

        Object bn = ConfigUtils.getObject(session, null, "maven.buildNumber");
        if (bn instanceof Integer) {
            this.buildNumber = (Integer) bn;
        } else if (bn instanceof String) {
            this.buildNumber = Integer.valueOf((String) bn);
        } else {
            this.buildNumber = null;
        }

        snapshots = new LinkedHashMap<>();

        /*

            System.exit(1);
        }
    }

    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
            String username = System.getenv("MVNW_USERNAME");
            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
            Authenticator.setDefault(new Authenticator() {

        while (!queue.isEmpty()) {
            ClassMetaData cl = queue.removeFirst();
            if (cl == null) {
                continue;
            }
            MethodMetaData overriddenMethod = cl.findDeclaredMethod(overrideSignature);
            if (overriddenMethod != null) {
                return overriddenMethod;
            }
            queue.add(cl.getSuperClass());

    @Override
    public List<String> convert(final String text, final String field, final String... langs) throws IOException {
        final ReadingConverter converter;
        if (langs == null || langs.length == 0) {
            converter = new LangAnayzerConverter(null);
        } else {
            final ReadingConverterChain chain = new ReadingConverterChain();
            for (final String lang : langs) {

    Iterable<@Nullable String> set = newHashSet("a", null, "b");
    assertTrue(Iterables.contains(set, null));
  }

  public void test_contains_null_set_no() {
    Iterable<String> set = newHashSet("a", "b");
    assertFalse(Iterables.contains(set, null));
  }

  public void test_contains_null_iterable_yes() {
    Iterable<@Nullable String> set = iterable("a", null, "b");
    assertTrue(Iterables.contains(set, null));

    /*
     * Even though it's weird to pass a defaultValue that is null, some callers do so. Those who
     * pass a literal "null" should probably just use `get`, but I would expect other callers to
     * pass an expression that *might* be null. This could happen with:
     *
     * - a `getFooOrDefault(@CheckForNull Foo defaultValue)` method that returns

                            "name": {"type": "string", "title": "Name"},
                            "age": IsDict(
                                {
                                    "anyOf": [{"type": "integer"}, {"type": "null"}],
                                    "title": "Age",
                                }
                            )
                            | IsDict(