Does OpenJDK 1.8 support JFR?

问题

I'm not sure if OpenJDK 1.8 supports JFR (java flight recorder). I know it was requested on the OpenJDK bugs forum.

Using OpenJDK on Linux and executing the following from a terminal:

jcmd `<pid>` JFR.start 

returns

java.lang.IllegalArgumentException: Unknown diagnostic command

回答1:

The OpenJDK 8 source code does not include the Java Flight Recorder implementation. That feature has been targeted to become part of OpenJDK source code with JDK 11, per http://openjdk.java.net/projects/jdk/11/ .

回答2:

Java Flight Recorder is a commercial product included in Java SE Advanced that is only included in the Oracle JDK and not in OpenJDK.

回答3:

Java flight recorder is not a part of 8th version but has to be open-sourced and included in 11th release according to
http://openjdk.java.net/jeps/328
https://bugs.openjdk.java.net/browse/JDK-8193393

Update(it's there): https://mail.openjdk.java.net/pipermail/announce/2018-September/000257.html

回答4:

Per http://hirt.se/blog/?p=1161 the JFR Backport to OpenJDK 8 is officially planned and already available to try in some builds: https://www.infoq.com/news/2020/02/jfr-coming-to-openjdk-8/

来源：https://stackoverflow.com/questions/42845964/does-openjdk-1-8-support-jfr