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The commands relevant to Java Flight Recorder are:Ĭheck the status of all recordings running for the specified process, including the recording identification number, file name, duration, and so on. To see a complete list of commands available to a runnning Java application, specify help as the diagnostic command after the process identifier (or the name of the main class). To see a list of all running Java processes, run the jcmd command without any arguments. Jcmd 5368 JFR.start duration=60s filename=myrecording.jfr For example, to start a 60-second recording on the running Java process with the identifier 5368 and save it to myrecording.jfr in the current directory, use the following: To issue a command, you have to pass the process identifier of the JVM (or the name of the main class) and the actual command as arguments to jcmd.
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The simplest way to execute a diagnostic command is to use the jcmd tool (located in the Java installation directory). For a more detailed description of Diagnostic Commands, see Appendix A, "Diagnostic Command Reference". You can also control recordings by using Java-specific diagnostic commands. This chapter explains more advanced ways of running and managing JFR recordings and contains the following sections: For more information about using the JMC client to control JFR, see the Flight Recorder Plug-in section of the Java Mission Control help. This plug-in enables access to JFR functionality through an intuitive GUI. The easiest and most intuitive way to use JFR is through the Flight Recorder plug-in that is integrated into Java Mission Control.
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This can be confusing but has no other negative implications. This means that if more than one recording is running, you might end up with more information in the recording than you wanted. However, in order to make the internal logic of Java Flight Recorder as streamlined as possible, the resulting recording always contains the union of all events for all recordings active at that time. You can run multiple recordings concurrently and configure each recording using different settings in particular, you can configure different recordings to capture different sets of events.
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To learn more about commercial features and how to enable them please visit. CPF1938: Command is not allowed while serviced job is not active.
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Java Flight Recorder requires a commercial license for use in production. JVAB605: ANZJVM failed with reason code &1.