[GR-41952] NPE in thread "Performance data" when using JFR on JDK19

[fniephaus]

When building a JDK19-based GraalVM from current master, a simple JFR example fails with a NPE in thread "Performance data":

$ $GRAALVM_HOME/bin/native-image --enable-monitoring -m jdk.httpserver
$ ./jdk.httpserver -XX:+FlightRecorder -XX:StartFlightRecording="filename=recording.jfr"
Binding to loopback by default. For all interfaces use "-b 0.0.0.0" or "-b ::".
Serving /home/fniephaus/dev/tmp/jwebserver and subdirectories on 127.0.0.1 port 8000
URL http://127.0.0.1:8000/
Exception in thread "Performance data" java.lang.NullPointerException: [no exception stack trace available because exception is thrown from code that must be allocation free]

Could you take a look at this please, @roberttoyonaga?

[roberttoyonaga]

I can have a look into this

[roberttoyonaga]

Hi Fabio! I think the problem should be fixed by: #5214

The the performance data thread uses a Thread.sleep here. I believe this is why it is throwing an exception with JDK19.

[fniephaus]

Hi Robert, thanks for checking...this is good news. :) Enjoy your weekend!

[roberttoyonaga]

Hi @fniephaus I think this is fixed now. This PR had the thread sleep fix #5807 that I mentioned above.

[fniephaus]

Thanks for the update, @roberttoyonaga. I can confirm this works now, great! :)