@SuppressWarnings("unchecked")
    public DefaultProfileActivationContext setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = Collections.unmodifiableMap((Map) systemProperties);
        } else {
            this.systemProperties = Collections.emptyMap();
        }

        return this;
    }

    /**

      return Collections.unmodifiableMap(super.column(columnKey));
    }

    @Override
    public Set<C> columnKeySet() {
      return Collections.unmodifiableSet(super.columnKeySet());
    }

    @Override
    public Map<C, Map<R, V>> columnMap() {
      return unmodifiableMap(Maps.transformValues(super.columnMap(), Collections::unmodifiableMap));
    }

    @Override

            new TestStringMapGenerator() {
              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {
                return unmodifiableMap(toHashMap(entries));
              }
            })
        .named("unmodifiableMap/HashMap")
        .withFeatures(
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.ALLOWS_ANY_NULL_QUERIES,

        // by getMessageByCode
        errorCodeMessagesTmp.put(0, "NT_STATUS_SUCCESS");

        errorCodeMessages = Collections.unmodifiableMap(errorCodeMessagesTmp);
        dosErrorCodeStatuses = Collections.unmodifiableMap(dosErrorCodeStatusesTmp);

        final Map<Integer, String> winErrorCodeMessagesTmp = new HashMap<>();
        for (int i = 0; i < WINERR_CODES.length; i++) {

public abstract class ForwardingImmutableMap<K, V> extends ImmutableMap<K, V> {

  final transient Map<K, V> delegate;

  ForwardingImmutableMap(Map<? extends K, ? extends V> delegate) {
    this.delegate = Collections.unmodifiableMap(delegate);
  }

  @SuppressWarnings("unchecked")
  ForwardingImmutableMap(boolean throwIfDuplicateKeys, Entry<? extends K, ? extends V>... entries) {
    Map<K, V> delegate = Maps.newLinkedHashMap();

    @Nonnull
    @Override
    public Map<String, String> getUserProperties() {
        return Collections.unmodifiableMap(new PropertiesAsMap(getMavenSession().getUserProperties()));
    }

    @Nonnull
    @Override
    public Map<String, String> getSystemProperties() {
        return Collections.unmodifiableMap(new PropertiesAsMap(getMavenSession().getSystemProperties()));
    }

    @Nonnull
    @Override

        properties.put(
                MavenArtifactProperties.CONSTITUTES_BUILD_PATH,
                String.valueOf(this.pathTypes.contains(JavaPathType.CLASSES)));
        this.properties = Collections.unmodifiableMap(properties);
    }

    @Override
    public String id() {
        return id;
    }

    @Override
    public String getId() {
        return id();
    }

    @Override

     */
    TEST_RUNTIME("test-runtime", false),

    /**
     * System scope.
     */
    SYSTEM("system", false);

    private static final Map<String, DependencyScope> IDS = Collections.unmodifiableMap(
            Stream.of(DependencyScope.values()).collect(Collectors.toMap(s -> s.id, s -> s)));

    /**
     * {@return the dependency scope for the given identifier, or {@code null} if none}.

            final Map.Entry entry = (Map.Entry) entries.next();
            entry.setValue(Collections.unmodifiableList((List) entry.getValue()));
        }
        return headerFields = Collections.unmodifiableMap(map);
    }

    @Override
    public Map getHeaderFields() {
        if (headerFields != null) {
            return headerFields;
        }
        try {
            handshake();

        }
        for (final Entry<String, List<String>> entry : map.entrySet()) {
            entry.setValue(Collections.unmodifiableList(entry.getValue()));
        }
        return this.headerFields = Collections.unmodifiableMap(map);
    }

    @Override
    public Map<String, List<String>> getHeaderFields() {
        if (this.headerFields != null) {
            return this.headerFields;
        }
        handshake();