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JDK10 の新しい光沢のある httpclient を新たに使用しようとしています。コードはとてもシンプルです。複数のスレッドから同期 HTTP 呼び出しを使用します。

private final HttpClient httpClient = HttpClient.newBuilder()
        .executor(Utils.newFixedThreadPoolExecutor(1, "HttpClient"))
        .build();

private JsonObject useHttpClient(URL url, String params) throws Exception {
    HttpRequest req = HttpRequest.newBuilder()
            .uri(url.toURI())
            .setHeader("Connection", "keep-alive")
            .setHeader("Accept-Encoding", "gzip")
            .timeout(timeout)
            .POST(HttpRequest.BodyPublisher.fromString(params))
            .build();
    HttpResponse<InputStream> response = httpClient.send(req, HttpResponse.BodyHandler.asInputStream());
    if (response.statusCode() != 200) {
        throw new IOException("Server returned " + response.statusCode());
    }
    String encoding = response.headers().firstValue("content-encoding").orElse("");
    return parseResponseStream(encoding, response.body());
}

ときどき NPE を取得します。

java.lang.NullPointerException: null
at jdk.incubator.http.internal.hpack.HeaderTable$Table.remove(HeaderTable.java:455) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.HeaderTable.evictEntry(HeaderTable.java:264) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.HeaderTable.put(HeaderTable.java:233) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.HeaderTable.put(HeaderTable.java:215) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.Decoder.resumeLiteralWithIndexing(Decoder.java:464) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.Decoder.proceed(Decoder.java:268) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.hpack.Decoder.decode(Decoder.java:246) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.Http2Connection.decodeHeaders(Http2Connection.java:471) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.Http2Connection.processFrame(Http2Connection.java:635) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.frame.FramesDecoder.decode(FramesDecoder.java:156) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.Http2Connection$FramesController.processReceivedData(Http2Connection.java:195) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.Http2Connection.asyncReceive(Http2Connection.java:528) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.Http2Connection$Http2TubeSubscriber.processQueue(Http2Connection.java:1054) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.common.SequentialScheduler$SynchronizedRestartableTask.run(SequentialScheduler.java:175) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:147) ~[jdk.incubator.httpclient:?]
at jdk.incubator.http.internal.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198) ~[jdk.incubator.httpclient:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135) [?:?]

私のコードに問題はありますか? この例外の理由は何ですか?

C:\Program Files\Java\jdk-10\bin>java -version
java version "10" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)
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