我已经为 JMeter 安装了Blazemeter HTTP/2 插件，但无法让 HTTP/2 请求正常工作。
我的最小测试如下所示：
- 线程组
- HTTP2 请求
- 服务器：stackoverflow.com
- 协议：https
- 查看结果树 Http2
- HTTP2 请求
运行测试会在视图结果树中显示以下采样器结果：
Thread Name:Thread Group 1-1
Sample Start:1970-01-01 01:00:00 CET
Load time:0
Connect Time:0
Latency:0
Size in bytes:2700
Sent bytes:0
Headers size in bytes:0
Body size in bytes:2700
Sample Count:1
Error Count:1
Data type ("text"|"bin"|""):text
Response code:Non HTTP response code: java.util.concurrent.ExecutionException
Response message:Non HTTP response message: org.eclipse.jetty.io.RuntimeIOException: javax.net.ssl.SSLHandshakeException: nullSession
HTTP2SampleResult fields:
ContentType:
DataEncoding: null
和日志：
2020-07-03 12:58:13,457 WARN o.a.j.v.ViewResultsFullVisualizer: Error loading result renderer: org.apache.jmeter.visualizers.RenderInBrowser
java.lang.NoClassDefFoundError: javafx/embed/swing/JFXPanel
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_252]
at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_252]
at com.blazemeter.jmeter.http2.visualizers.ViewResultsFullVisualizer.createComboRender(ViewResultsFullVisualizer.java:396) ~[jmeter-bzm-http2-1.5.jar:?]
at com.blazemeter.jmeter.http2.visualizers.ViewResultsFullVisualizer.createLeftPanel(ViewResultsFullVisualizer.java:322) ~[jmeter-bzm-http2-1.5.jar:?]
at com.blazemeter.jmeter.http2.visualizers.ViewResultsFullVisualizer.init(ViewResultsFullVisualizer.java:283) ~[jmeter-bzm-http2-1.5.jar:?]
at com.blazemeter.jmeter.http2.visualizers.ViewResultsFullVisualizer.<init>(ViewResultsFullVisualizer.java:118) ~[jmeter-bzm-http2-1.5.jar:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_252]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_252]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_252]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_252]
at org.apache.jmeter.gui.GuiPackage.getGuiFromCache(GuiPackage.java:405) ~[ApacheJMeter_core.jar:5.2.1]
at org.apache.jmeter.gui.GuiPackage.createTestElement(GuiPackage.java:352) ~[ApacheJMeter_core.jar:5.2.1]
at org.apache.jmeter.gui.action.AddToTree.doAction(AddToTree.java:68) ~[ApacheJMeter_core.jar:5.2.1]
at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:88) ~[ApacheJMeter_core.jar:5.2.1]
at org.apache.jmeter.gui.action.ActionRouter.lambda$actionPerformed$0(ActionRouter.java:70) ~[ApacheJMeter_core.jar:5.2.1]
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) [?:1.8.0_252]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) [?:1.8.0_252]
at java.awt.EventQueue.access$500(EventQueue.java:97) [?:1.8.0_252]
at java.awt.EventQueue$3.run(EventQueue.java:709) [?:1.8.0_252]
at java.awt.EventQueue$3.run(EventQueue.java:703) [?:1.8.0_252]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_252]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74) [?:1.8.0_252]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) [?:1.8.0_252]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) [?:1.8.0_252]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) [?:1.8.0_252]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) [?:1.8.0_252]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:1.8.0_252]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) [?:1.8.0_252]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) [?:1.8.0_252]
Caused by: java.lang.ClassNotFoundException: javafx.embed.swing.JFXPanel
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_252]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_252]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_252]
... 29 more
2020-07-03 12:58:19,743 INFO o.a.j.e.StandardJMeterEngine: Running the test!
2020-07-03 12:58:19,745 INFO o.a.j.s.SampleEvent: List of sample_variables: []
2020-07-03 12:58:19,751 INFO o.a.j.g.u.JMeterMenuBar: setRunning(true, *local*)
2020-07-03 12:58:20,368 INFO o.a.j.e.StandardJMeterEngine: Starting ThreadGroup: 1 : Thread Group
2020-07-03 12:58:20,371 INFO o.a.j.e.StandardJMeterEngine: Starting 1 threads for group Thread Group.
2020-07-03 12:58:20,372 INFO o.a.j.e.StandardJMeterEngine: Thread will continue on error
2020-07-03 12:58:20,373 INFO o.a.j.t.ThreadGroup: Starting thread group... number=1 threads=1 ramp-up=1 delayedStart=false
2020-07-03 12:58:20,376 INFO o.a.j.t.ThreadGroup: Started thread group number 1
2020-07-03 12:58:20,376 INFO o.a.j.e.StandardJMeterEngine: All thread groups have been started
2020-07-03 12:58:20,381 INFO o.a.j.t.JMeterThread: Thread started: Thread Group 1-1
2020-07-03 12:58:20,489 WARN o.e.j.i.SelectorManager: Exception while notifying connection SslConnection@694fa68a::SocketChannelEndPoint@65c6505a{stackoverflow.com/151.101.129.69:443<->/192.168.0.178:34818,CLOSED,fill=-,flush=-,to=2/30000}{io=1/1,kio=-1,kro=-1}->SslConnection@694fa68a{NEED_UNWRAP,eio=-1/-1,di=-1,fill=IDLE,flush=IDLE}~>DecryptedEndPoint@58ec6f77{stackoverflow.com/151.101.129.69:443<->/192.168.0.178:34818,CLOSED,fill=-,flush=-,to=10/30000}=>ALPNClientConnection@1d8fc708
org.eclipse.jetty.io.RuntimeIOException: javax.net.ssl.SSLHandshakeException: nullSession
at org.eclipse.jetty.io.NegotiatingClientConnection.onOpen(NegotiatingClientConnection.java:72) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ssl.SslConnection.onOpen(SslConnection.java:360) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.SelectorManager.connectionOpened(SelectorManager.java:324) [jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ManagedSelector.createEndPoint(ManagedSelector.java:276) [jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ManagedSelector.access$1800(ManagedSelector.java:62) [jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ManagedSelector$CreateEndPoint.run(ManagedSelector.java:933) [jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) [jetty-util-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) [jetty-util-9.4.26.v20200117.jar:9.4.26.v20200117]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
Caused by: javax.net.ssl.SSLHandshakeException: nullSession
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.handshakeFailed(SslConnection.java:933) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.flush(SslConnection.java:1142) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.NegotiatingClientConnection.onOpen(NegotiatingClientConnection.java:63) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
... 8 more
Caused by: java.lang.NoSuchFieldError: nullSession
at sun.security.ssl.ClientHandshaker.getKickstartMessage(ClientHandshaker.java:1350) ~[?:1.8.0_252]
at sun.security.ssl.Handshaker.kickstart(Handshaker.java:1117) ~[?:1.8.0_252]
at sun.security.ssl.SSLEngineImpl.kickstartHandshake(SSLEngineImpl.java:736) ~[?:1.8.0_252]
at sun.security.ssl.SSLEngineImpl.writeAppRecord(SSLEngineImpl.java:1232) ~[?:1.8.0_252]
at sun.security.ssl.SSLEngineImpl.wrap(SSLEngineImpl.java:1185) ~[?:1.8.0_252]
at javax.net.ssl.SSLEngine.wrap(SSLEngine.java:511) ~[?:1.8.0_252]
at org.eclipse.jetty.io.ssl.SslConnection.wrap(SslConnection.java:412) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.flush(SslConnection.java:1052) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
at org.eclipse.jetty.io.NegotiatingClientConnection.onOpen(NegotiatingClientConnection.java:63) ~[jetty-io-9.4.26.v20200117.jar:9.4.26.v20200117]
... 8 more
2020-07-03 12:58:20,494 WARN o.e.j.i.ManagedSelector: org.eclipse.jetty.io.RuntimeIOException: javax.net.ssl.SSLHandshakeException: nullSession
2020-07-03 12:58:20,498 INFO o.a.j.t.JMeterThread: Thread is done: Thread Group 1-1
2020-07-03 12:58:20,498 INFO o.a.j.t.JMeterThread: Thread finished: Thread Group 1-1
2020-07-03 12:58:20,499 INFO o.a.j.e.StandardJMeterEngine: Notifying test listeners of end of test
2020-07-03 12:58:20,500 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, *local*)
将协议更改为 HTTP
如果我将协议更改为HTTP，则会得到以下采样器结果：
Thread Name:Thread Group 1-1
Sample Start:2020-07-03 13:11:59 CEST
Load time:0
Connect Time:354
Latency:0
Size in bytes:1072
Sent bytes:0
Headers size in bytes:0
Body size in bytes:1072
Sample Count:1
Error Count:1
Data type ("text"|"bin"|""):text
Response code:java.util.concurrent.TimeoutException
Response message:null
这是日志：
2020-07-03 13:11:58,817 INFO o.a.j.e.StandardJMeterEngine: Running the test!
2020-07-03 13:11:58,819 INFO o.a.j.s.SampleEvent: List of sample_variables: []
2020-07-03 13:11:58,824 INFO o.a.j.g.u.JMeterMenuBar: setRunning(true, *local*)
2020-07-03 13:11:59,307 INFO o.a.j.e.StandardJMeterEngine: Starting ThreadGroup: 1 : Thread Group
2020-07-03 13:11:59,307 INFO o.a.j.e.StandardJMeterEngine: Starting 1 threads for group Thread Group.
2020-07-03 13:11:59,307 INFO o.a.j.e.StandardJMeterEngine: Thread will continue on error
2020-07-03 13:11:59,308 INFO o.a.j.t.ThreadGroup: Starting thread group... number=1 threads=1 ramp-up=1 delayedStart=false
2020-07-03 13:11:59,309 INFO o.a.j.t.ThreadGroup: Started thread group number 1
2020-07-03 13:11:59,310 INFO o.a.j.e.StandardJMeterEngine: All thread groups have been started
2020-07-03 13:11:59,312 INFO o.a.j.t.JMeterThread: Thread started: Thread Group 1-1
2020-07-03 13:11:59,690 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for text/html is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2020-07-03 13:11:59,691 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for application/xhtml+xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2020-07-03 13:11:59,692 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for application/xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2020-07-03 13:11:59,692 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for text/xml is org.apache.jmeter.protocol.http.parser.LagartoBasedHtmlParser
2020-07-03 13:11:59,693 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for text/vnd.wap.wml is org.apache.jmeter.protocol.http.parser.RegexpHTMLParser
2020-07-03 13:11:59,693 INFO c.b.j.h.s.HTTP2StreamHandler: Parser for text/css is org.apache.jmeter.protocol.http.parser.CssParser
2020-07-03 13:11:59,736 INFO o.a.j.t.JMeterThread: Thread is done: Thread Group 1-1
2020-07-03 13:11:59,737 INFO o.a.j.t.JMeterThread: Thread finished: Thread Group 1-1
2020-07-03 13:12:19,741 ERROR c.b.j.h.s.HTTP2SampleResult: Error while await for response
java.util.concurrent.TimeoutException: null
at java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1784) ~[?:1.8.0_252]
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1928) ~[?:1.8.0_252]
at com.blazemeter.jmeter.http2.sampler.HTTP2Connection.awaitResponses(HTTP2Connection.java:171) ~[jmeter-bzm-http2-1.5.jar:?]
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.lambda$waitAllResponses$1(HTTP2Request.java:587) ~[jmeter-bzm-http2-1.5.jar:?]
at java.util.HashMap$Values.forEach(HashMap.java:981) [?:1.8.0_252]
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.waitAllResponses(HTTP2Request.java:585) [jmeter-bzm-http2-1.5.jar:?]
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.threadFinished(HTTP2Request.java:548) [jmeter-bzm-http2-1.5.jar:?]
at org.apache.jmeter.threads.JMeterThread$ThreadListenerTraverser.addNode(JMeterThread.java:774) [ApacheJMeter_core.jar:5.2.1]
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:994) [jorphan.jar:5.2.1]
at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:977) [jorphan.jar:5.2.1]
at org.apache.jmeter.threads.JMeterThread.threadFinished(JMeterThread.java:741) [ApacheJMeter_core.jar:5.2.1]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:329) [ApacheJMeter_core.jar:5.2.1]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
2020-07-03 13:12:19,756 INFO o.a.j.e.StandardJMeterEngine: Notifying test listeners of end of test
2020-07-03 13:12:19,758 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, *local*)
我的设置：
我openjdk version "1.8.0_252"在 Linux ( ) 上使用 JMeter 5.2.1 和 OpenJDK 8 ( version 5.6.15-arch1-1)
（在 Ubuntu 20.04 上使用 JMeter 5.3 得到相同的结果，在 CLI 模式下运行）
jmeter根据 HTTP/2 插件的要求，我在启动脚本的顶部添加了以下行：
JVM_ARGS="-Xbootclasspath/p:/opt/jmeter/lib/alpn-boot-8.1.13.v20181017.jar"
如何解决或调试此问题？
更新：
我发现，一旦我alpn-boot按照上面提到的方式使用，我对常规 HTTP 请求的行为相同，所以这似乎是该库的问题。在https://github.com/jetty-project/jetty-alpn/blob/master/docs/version_mapping.properties有一个 jetty-alpn 版本与 Java 版本的映射表，它目前不包含我的 Java 版本。
文档说_
该表仅显示了到 OpenJDK 8u242 的映射，这是需要 ALPN 引导 jar 的最后一个版本。
但是如果我在没有 alpn 参数的情况下启动 JMeter，我会看到这样的结果（HTTP/2 with HTTPS）：
Response code:Non HTTP response code: java.util.concurrent.ExecutionException
Response message:Non HTTP response message: java.lang.IllegalStateException: No Client ALPNProcessors!