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Java Flight Recorder Limitations

Looking for Zing? The Azul Zing Virtual Machine is now Azul Zulu Prime Builds of OpenJDK and part of Azul Platform Prime. Learn more.

  • I do not see Memory Leaks reported in Zulu Mission Control and/or Java Flight Recorder (JFR) logs, how can I turn it on?

    We are sorry, it is not implemented yet. Stay tuned.

  • How can I see G1 garbage collector events in JFR/ZMC?

    Azul Zulu Prime Builds of OpenJDK (Azul Zulu Prime JVM) does not support the G1 garbage collector and uses Azul’s very own C4 (GPGC) collector. Because of that, you can only see GPGC events in JFR/ZMC when monitoring Azul Zulu Prime JVM.

  • Why do Azul Platform Prime JFR events refer to the null bootstrap class loader as the class loader for anonymous classes?

    We are sorry, it is inaccurate.

  • Which Azul Zulu Prime JVM events specific to OpenJDK functionality does not Azul Platform Prime Java Flight Recorder support?

    Azul Platform Prime JFR does not generate events related to specific garbage collects, metaspace, biased locking, or additional events related to details of GPGC execution for example.

Note
It is recommended to read Azul Platform Prime Java Flight recordings using the Zulu Mission Control (ZMC) tool available for download from the Azul Zulu Mission Control download page.