[英]NullPointerException in jdk.incubator.httpclient
我正在尝试从JDK10使用新的闪亮的httpclient。 代码非常简单。 我使用同步HTTP调用形式多个线程:
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) [?:?]
我的代码有问题吗? 这个例外的原因是什么?
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)
我的代码有问题吗?
作为熟悉JDK HTTP Client API的人,我看不到您发布的代码的任何特定问题。
这个例外的原因是什么?
异常的原因是JDK HTTP客户端HPACK代码中的错误。 在代码中,您无法做任何事情来解决它。
有关JDK HPACK错误的具体信息可以在https://bugs.openjdk.java.net/browse/JDK-8200625上找到(复制技术信息,来自上述OpenJDK JIRA问题,这里不会增加价值,可能会变成快速陈旧)
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