未启用JMC Java飞行记录器

Question

我正在使用spring工具套件和java任务控制插件来启动一个应用程序，我想使用JFR来监控它。我将-XX:+UnlockCommercialFeatures -XX:+FlightRecorder添加到SpringToolSuite4.ini中，并使用这两个标志(如果我理解正确的话，这两个标志都不是必需的)和要监视的应用程序的运行配置>参数> VM参数中的-XX:+FlightRecorder设置JAVA_OPTS。当同时将这两个标志添加到运行配置中时，应用程序不能使用openJdk启动。

在JVM浏览器中启动应用程序后，当选择Flight Recorder时，我得到以下异常。

java.lang.RuntimeException: Flight Recorder features are not enabled. To enable this you need to use a Java 7u4 or later JVM started with -XX:+UnlockCommercialFeatures -XX:+FlightRecorder.
    at com.oracle.jmc.flightrecorder.controlpanel.ui.FlightRecorderProvider.refresh(FlightRecorderProvider.java:105)
    at com.oracle.jmc.browser.views.JVMBrowserView$1.run(JVMBrowserView.java:98)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.oracle.jmc.rjmx.services.jfr.FlightRecorderException: Flight Recorder features are not enabled. To enable this you need to use a Java 7u4 or later JVM started with -XX:+UnlockCommercialFeatures -XX:+FlightRecorder.
    at com.oracle.jmc.flightrecorder.controlpanel.ui.FlightRecorderProvider.getService(FlightRecorderProvider.java:161)
    at com.oracle.jmc.flightrecorder.controlpanel.ui.FlightRecorderProvider.refreshRecordings(FlightRecorderProvider.java:117)
    at com.oracle.jmc.flightrecorder.controlpanel.ui.FlightRecorderProvider.refresh(FlightRecorderProvider.java:94)
    ... 7 more

我在下面的java版本中尝试了一下。

$ java -version
openjdk version "11.0.2" 2018-10-16
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.2+7)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.2+7, mixed mode)

或者使用oracle的JDK。

$ java -version
java version "11.0.2" 2019-01-15 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.2+9-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.2+9-LTS, mixed mode)

上面提到的JDK中没有一个是java 8附带的jmc.exe，这是插件的一部分吗？

我怎样才能让它运行起来？

Answer 1

IIRC，Java 11要求JMC 7能够启动和查看录制。JMC7EA版本预计很快就会出现在这里-- https://jdk.java.net/jmc/

在此期间，您可以自己构建JMC，有关如何构建的信息，请参阅http://hg.openjdk.java.net/jmc/jmc7/ (或者github，不能确切地确定它同步到哪个版本- https://github.com/JDKMissionControl/jmc)和自述文件。

您可以使用JVM命令行标志和jcmd启动记录，并使用https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jfr/jdk/jfr/consumer/package-summary.html解析记录