我在 Ubuntu 9.0.4 上使用 Java 12、JMeter 5.1.1，并在尝试发送 HTTP/2 请求时遇到以下异常：
Response code: Non HTTP response code: java.util.concurrent.ExecutionException
Response message: Non HTTP response message: java.lang.IllegalStateException: No Client ALPNProcessors!
响应正文中的堆栈跟踪：
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: No Client ALPNProcessors!
at org.eclipse.jetty.util.FuturePromise.get(FuturePromise.java:138)
at com.blazemeter.jmeter.http2.sampler.HTTP2Connection.connect(HTTP2Connection.java:68)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.setConnection(HTTP2Request.java:278)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.sample(HTTP2Request.java:138)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.sample(HTTP2Request.java:115)
at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:622)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:546)
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:486)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:253)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.lang.IllegalStateException: No Client ALPNProcessors!
at org.eclipse.jetty.alpn.client.ALPNClientConnectionFactory.<init>(ALPNClientConnectionFactory.java:54)
at org.eclipse.jetty.http2.client.HTTP2Client.lambda$doStart$1(HTTP2Client.java:155)
at org.eclipse.jetty.http2.client.HTTP2Client$ClientSelectorManager.newConnection(HTTP2Client.java:438)
at org.eclipse.jetty.io.ManagedSelector.createEndPoint(ManagedSelector.java:222)
at org.eclipse.jetty.io.ManagedSelector.access$1500(ManagedSelector.java:60)
at org.eclipse.jetty.io.ManagedSelector$CreateEndPoint.run(ManagedSelector.java:825)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:754)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:672)
... 1 more
JMeter 5.1.1 附带jetty-alpn-client-9.4.9.v20180320.jar默认情况下。
然后我从下载 jetty alpn java 客户端库http://central.maven.org/maven2/org/eclipse/jetty/jetty-alpn-java-client/ http://central.maven.org/maven2/org/eclipse/jetty/jetty-alpn-java-client/并将其放入 jmeter 安装的 lib/ 文件夹中并导致此异常：
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: org/eclipse/jetty/alpn/client/ALPNClientConnectionFactory
at org.eclipse.jetty.util.FuturePromise.get(FuturePromise.java:138)
at com.blazemeter.jmeter.http2.sampler.HTTP2Connection.connect(HTTP2Connection.java:68)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.setConnection(HTTP2Request.java:278)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.sample(HTTP2Request.java:138)
at com.blazemeter.jmeter.http2.sampler.HTTP2Request.sample(HTTP2Request.java:115)
at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:622)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:546)
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:486)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:253)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.lang.NoClassDefFoundError: org/eclipse/jetty/alpn/client/ALPNClientConnectionFactory
at org.eclipse.jetty.http2.client.HTTP2Client.lambda$doStart$1(HTTP2Client.java:155)
at org.eclipse.jetty.http2.client.HTTP2Client$ClientSelectorManager.newConnection(HTTP2Client.java:438)
at org.eclipse.jetty.io.ManagedSelector.createEndPoint(ManagedSelector.java:222)
at org.eclipse.jetty.io.ManagedSelector.access$1500(ManagedSelector.java:60)
at org.eclipse.jetty.io.ManagedSelector$CreateEndPoint.run(ManagedSelector.java:825)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:754)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:672)
... 1 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.alpn.client.ALPNClientConnectionFactory
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:436)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 8 more
我切换到 Java 11 但遇到同样的错误。
任何建议和见解都值得赞赏。
No Client ALPNProcessors!是来自处理 ALPN 的 Jetty 库的消息。
因为你运行在 JDK 12 中（而且我认为与 JDK 11 没有什么大的区别，所以 JDK 12 应该没问题），所以你必须有jetty-alpn-java-clientjar 放在类路径中，以便 Jetty 库能够找到该类的实现ALPNProcessor.Client类（通过ServiceLoader机制），如错误所示，无法找到。
您没有详细说明如何设置 TLS 等，我希望 JMeter 能够jetty-alpn-java-clientjar 已经在类路径中，但显然您的设置（或 JMeter 中）有问题。
我会仔细检查 JMeter 如何配置 TLS；如果它使用标准 JDK 实现，那么它必须具有jetty-alpn-java-clientjar 在类路径中。
如果 JMeter 使用其他 TLS 实现（例如 Conscrypt），那么 Jetty 项目提供类似的库（例如jetty-alpn-conscrypt-clientjar）同样应该位于类路径中。
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