问题
I'm just about start using Java Mission Control 5.3.0.
I have added -XX:+UnlockCommercialFeatures -XX:+FlightRecorder into my web-app's jetty.template.
Then I start the web-app with mvn jetty:run.
But while I was starting Flight Recorder I got the problem occurred pop-up as below.
'Start Flight Recording.. (Last attempt failed)' have encountered a problem.Commercial features are not enabled. In JDK7u4 and above,the JVM must be started with -XX:+UnlockCommercialFeatures -XX:+FlightRecorder .
And I also try adding the flags as below into pom.xml but it doesn't work.
<jvmArgs>
<jvmArg>-Xmx128m</jvmArg>
<jvmArg>-Xms128m</jvmArg>
<jvmArg>-XX:MaxPermSize=512m</jvmArg>
<jvmArg>-XX:+UnlockCommercialFeatures</jvmArg>
<jvmArg>-XX:+FlightRecorder</jvmArg>
<jvmArg>-XX:StartFlightRecording=duration=160s,delay=20s,settings=profile,filename=target/recording.jfr</jvmArg>
</jvmArgs>
What should I do for enable Flight Recorder on my web-app?
回答1:
If you are using jcmd
command from jdk, then could enable JFR via:
jcmd 31118 VM.unlock_commercial_features
Then use JFR.
e.g
jcmd 31118 JFR.start name=a
回答2:
That configuration should be added to the running VM of Jetty so I'd try this:
mvn jetty:run -XX:+UnlockCommercialFeatures -XX:+FlightRecorder
I could not test this, and I work most on Tomcat, but I think this could help you
回答3:
I got the answer by using below.
export MAVEN_OPTS="$MAVEN_OPTS -XX:+UnlockCommercialFeatures -XX:+FlightRecorder"
来源:https://stackoverflow.com/questions/25518834/how-to-add-enable-flag-for-flight-recorder-in-maven-project