![]() ![]() There is a possible risk of data-format inconsistency due to data format incompatibility. It’s recommended and important to consider to run a similar versions of Java SE when the tools JMC, JFR and jcmd are used. The JDK Flight Recorder is integrated into the JDK since the Java SE 11 release ( java versions: JEP-328), and no additional action is required to enable emitting the events. JVM paramaters : -XX:+UnlockCommercialFeatures (JDK 8), -XX:+FlightRecorder (JDKs 8,9,10). ![]() Enabling features can be done in following ways: For JDK 8 is one more step required, namely the application requires to have enabled a commercial features (attention required). It means the “ jmc” command resided in $JAVA_HOME/bin folder. The JDK Mission Control was a part of the JDK for very long time, till the version 10. It is important to mention that such chunks of events are not chronologically ordered but JFR displays them chronologically. Such events chunks are stored into the file through the various buffers to eliminate the cost of I/O operations. The collected events are stored in the external single output file. Of course, there is a possibility to create a custom events, but this is out of the scope of current tutorial.
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