我正在尝试从JDK10新使用新的闪亮的httpclient.
代码很简单.我使用多个线程的同步HTTP调用：

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());
}

有时我会得到NPE：

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) [?:?]

我的代码有什么问题吗？发生此异常的原因可能是什么？

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)

解决方法:

Are there any problem in my code?

作为熟悉JDK HTTP Client API的人,我看不到您发布的代码有任何特定问题.

What can be reason for this exception?

发生异常的原因是JDK HTTP客户端HPACK代码中的错误.您无法在代码中采取任何措施来解决该问题.

有关JDK HPACK错误的特定信息,请参见https://bugs.openjdk.java.net/browse/JDK-8200625(重复的技术信息,来自上述的OpenJDK JIRA问题,此处不会增加价值,并且可能会很快变得过时)