HttpRequest.BodyPublisher не может найти символ

Error:(226, 34) java: cannot find symbol symbol: variable BodyPublisher location: class jdk.incubator.http.HttpRequest

private static JSONObject sendRequest(JSONObject json) throws Exception {
    HttpClient client;
    InetSocketAddress proxy = getRandomProxy();

    if (proxy == null) {
        client = HttpClient.newHttpClient();
    } else {
        client = HttpClient.newBuilder().proxy(ProxySelector.of(proxy)).build();
    }

    HttpRequest httpRequest = HttpRequest
            .newBuilder(new URI(BASE_URL))
            .header("Accept", "application/json")
            .header("Content-Type", "application/json")
            .timeout(TIMEOUT_DURATION)
            .POST(HttpRequest.BodyPublisher.fromString(json.toString()))
            .build();

    HttpResponse<String> httpResponse = client.send(httpRequest, HttpResponse.BodyHandler.asString());
    String jsonResponse = httpResponse.body();

    return new JSONObject(jsonResponse);
}

module-info.java:

module MyProject {

    requires jdk.incubator.httpclient;

}

Я пробовал это с OpenJDK 10 и Oracle JDK 10 в Linux.