Java Flight Recorder (JFR) used to be a commercial add-on of the Oracle JDK. As it’s been open sourced along with Java Mission Control, everyone using OpenJDK 11 can now troubleshoot their Java apps with this excellent tool that's free of charge. You can find out more in this great example!
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https://dzone.com/articles/using-java-flight-recorder-with-openjdk-11-1