Re: Oracle Java Mission Control

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Christian Erdmann

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Jul 13, 2024, 3:27:19 PM7/13/24

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The latest versions of the JDK no longer include Java Mission Control (JMC). The jmc launcher has been removed from the JDK bin directory, and the missioncontrol directory has been removed from the JDK lib directory. The .jfr file association is not registered by JDK installers. JMC is now available as a separate download. Please visit for more information.

In addition to creating custom events via the Event API, you can also instrument your code after the fact to add events to a running application. JMC also has a convenient tool for this, with the brilliant name of Agent. The JMC Agent uses a set of configurations to define events and then instruments the running code with them. Once the session is over, the instrumentation is removed. If you are familiar with Byteman (and you should be), Agent is very similar, but instead of a full Turing complete language at your disposal, Agent focuses on JFR events alone. The reduction in scope allows us to focus specifically on the problem of instrumenting JFR with more fine-tuned tools, which also partially solves issues like security and permissions. We are also working on a JMC plugin to control and configure Agent, it's a work in progress but is already useful and you can find it here.

Oracle Java Mission Control

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Websocket for selections
There is a new websocket API available that pushes stack trace data from selections in the JFR UI as JSON on a user defined port. This allows for programmatic control of the visualization directly in the browser. Tools like observablehq.com can be used to invent new visualizations, or to alter the visualization. To get started, simply go to the Flight Recorder preferences in JMC, and select the Websocket port to use (0 to disable). A set of example visualizations are available here: @cimi/java-mission-control.

java.lang.RuntimeException: Access denied! Invalid access level for requested MBeanServer operation. at com.jrockit.mc.flightrecorder.controlpanel.ui.FlightRecorderProvider.refresh(FlightRecorderProvider.java:110) at com.jrockit.mc.browser.views.JVMBrowserView$1.run(JVMBrowserView.java:100) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at Caused by: java.lang.SecurityException: Access property for this identity should be similar to: readwrite create com.sun.management.MissionControl at ....

Connect to the application using Java Mission Control and either do a manual recording or set up a memory trigger. The user guide for mission control is at -5-5/jmc-user-guide/index.html and -5-5/jfr-runtime-guide/index.html