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JFR Connection

The jfr-connection module provides a core library for configuring, starting, stopping, and reading Java Flight Recording files from a JVM. The code does not depend on the jdk.jfr module and will compile and run against JDK 8 or higher. It uses a connection to an MBean server, which can be the platform MBean server, or a remote MBean server connected by means of JMX.

  • Java 8+
  • Build with ./gradlew :jfr-connection:build

The main entry point is io.opentelemetry.contrib.jfr.connection.FlightRecorderConnection:

  // The MBeanServerConnection can be local or remote
  MBeanServerConnection mBeanServer = ManagementFactory.getPlatformMBeanServer();

  FlightRecorderConnection flightRecorderConnection = FlightRecorderConnection.connect(mBeanServer);
  RecordingOptions recordingOptions = new RecordingOptions.Builder().disk("true").build();
  RecordingConfiguration recordingConfiguration = RecordingConfiguration.PROFILE_CONFIGURATION;

  try (Recording recording = flightRecorderConnection.newRecording(recordingOptions, recordingConfiguration)) {
      recording.start();
      TimeUnit.SECONDS.sleep(10);
      recording.stop();

      recording.dump(Paths.get(System.getProperty("user.dir"), "recording.jfr").toString());
  }

Note on Oracle JDK 8:

For Oracle JDK 8, it may be necessary to unlock the Java Flight Recorder commercial feature with the JVM arg -XX:+UnlockCommercialFeatures -XX:+FlightRecorder. Starting with JDK 8u262, Java Flight Recorder is available for all OpenJDK distributions.

Component owners

Learn more about component owners in component_owners.yml.