Java Code Examples for jdk.jfr.internal.JVM#getJVM()

public static void main(String... args) throws Exception {
    JVM jvm = JVM.getJVM();
    // Ensure that repeated failures can be handled
    for (int i = 1; i < 4; i++) {
        System.out.println("About to try failed initialization, attempt " + i + " out of 3");
        assertFailedInitialization(jvm);
        System.out.println("As expected, initialization failed.");
    }
    // Ensure that Flight Recorder can be initialized properly after failures
    Configuration defConfig = Configuration.getConfiguration("default");
    Recording r = new Recording(defConfig);
    r.start();
    r.stop();
    r.dump(Paths.get("recording.jfr"));
    r.close();
}
 

public static void main(String... args) {
    FlightRecorder.getFlightRecorder();
    JVM jvm = JVM.getJVM();

    long id10 = getStackIdOfDepth(10);
    assertValid(id10);

    long id5 = getStackIdOfDepth(5);
    assertValid(id5);

    Asserts.assertNotEquals(id5, id10, "Different stack depth must return different stack trace ids");

    assertMaxSkip(jvm);
}
 

public static void main(String... args) {
    FlightRecorder.getFlightRecorder();
    JVM jvm = JVM.getJVM();

    long id10 = getStackIdOfDepth(10);
    assertValid(id10);

    long id5 = getStackIdOfDepth(5);
    assertValid(id5);

    Asserts.assertNotEquals(id5, id10, "Different stack depth must return different stack trace ids");

    assertMaxSkip(jvm);
}
 

private void initializeWithForcedInstrumentation(Map<String, String> settings) {
    if (!hasJDKEvents(settings)) {
        return;
    }
    JVM jvm = JVM.getJVM();
    try {
       jvm.setForceInstrumentation(true);
        FlightRecorder.getFlightRecorder();
    } finally {
       jvm.setForceInstrumentation(false);
    }
}
 

public static void main(String... args) throws InterruptedException {

        JVM jvm = JVM.getJVM();
        String pid = jvm.getPid();

        try {
            String managementPid = String.valueOf(getProcessId());
            assertEquals(pid, managementPid, "Pid doesn't match value returned by RuntimeMXBean");
        } catch (NumberFormatException nfe) {
            throw new AssertionError("Pid must be numeric, but was '" + pid + "'");
        }
    }
 

public static void main(String... args) throws InterruptedException {
    // Not enabled
    assertCounterTime();

    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    assertCounterTime();
    // Enabled
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) throws InterruptedException {
    // Not enabled
    assertCounterTime();

    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    assertCounterTime();
    // Enabled
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    jvm.setFileNotification(MAX_CHUNK_SIZE);
    jvm.beginRecording();
    jvm.endRecording();
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    assertClassIds();
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    assertClassIds();
    jvm.destroyNativeJFR();
    assertClassIds();
}
 

public static void main(String... args) {
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    EventWriter writer = EventWriter.getEventWriter();
    assertNotNull(writer, "EventWriter should not be null");
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) throws ClassNotFoundException {
    JVM jvm = JVM.getJVM();
    // before creating  native
    assertEmptyEventList(jvm);
    jvm.createNativeJFR();
    // after creating native
    assertEmptyEventList(jvm);

    // Test event class load is triggered and only once
    Class<? extends Event> clazz = initialize("jdk.jfr.jvm.HelloWorldEvent1");
    // check that the event class is registered
    assertEventsIncluded(jvm, clazz);
    // second active use of the same event class should not add another class
    // to the list - it would already be loaded
    clazz = initialize(clazz);
    assertEventsIncluded(jvm, clazz);

    // second event class
    Class<? extends Event> clazz2 = initialize("jdk.jfr.jvm.HelloWorldEvent2");
    // the list of event classes should now have two classes registered
    assertEventsIncluded(jvm, clazz, clazz2);

    // verify that an abstract event class is not included
    Class<? extends Event> abstractClass = initialize(MyAbstractEvent.class); // to run <clinit>
    assertEventsExcluded(jvm, abstractClass);

    // verify that a class that is yet to run its <clinit> is not included in the list of event classes
    assertEventsExcluded(jvm, MyUnInitializedEvent.class);

    // ensure old classes are not lost
    assertEventsIncluded(jvm, clazz, clazz2);

    jvm.destroyNativeJFR();
}
 

private void initializeWithForcedInstrumentation(Map<String, String> settings) {
    if (!hasJDKEvents(settings)) {
        return;
    }
    JVM jvm = JVM.getJVM();
    try {
        jvm.setForceInstrumentation(true);
        FlightRecorder.getFlightRecorder();
    } finally {
        jvm.setForceInstrumentation(false);
    }
}
 

private void initializeWithForcedInstrumentation(Map<String, String> settings) {
    if (!hasJDKEvents(settings)) {
        return;
    }
    JVM jvm = JVM.getJVM();
    try {
       jvm.setForceInstrumentation(true);
        FlightRecorder.getFlightRecorder();
    } finally {
       jvm.setForceInstrumentation(false);
    }
}
 

public static void main(String... args) throws InterruptedException {
    // Not enabled
    assertCounterTime();

    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    assertCounterTime();
    // Enabled
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    EventWriter writer = EventWriter.getEventWriter();
    assertNotNull(writer, "EventWriter should not be null");
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    jvm.setFileNotification(MAX_CHUNK_SIZE);
    jvm.beginRecording();
    jvm.endRecording();
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    assertClassIds();
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    assertClassIds();
    jvm.destroyNativeJFR();
    assertClassIds();
}
 

public static void main(String... args) {
    JVM jvm = JVM.getJVM();
    jvm.createNativeJFR();
    EventWriter writer = EventWriter.getEventWriter();
    assertNotNull(writer, "EventWriter should not be null");
    jvm.destroyNativeJFR();
}
 

public static void main(String... args) throws ClassNotFoundException {
    JVM jvm = JVM.getJVM();
    // before creating  native
    assertEmptyEventList(jvm);
    jvm.createNativeJFR();
    // after creating native
    assertEmptyEventList(jvm);

    // Test event class load is triggered and only once
    Class<? extends Event> clazz = initialize("jdk.jfr.jvm.HelloWorldEvent1");
    // check that the event class is registered
    assertEventsIncluded(jvm, clazz);
    // second active use of the same event class should not add another class
    // to the list - it would already be loaded
    clazz = initialize(clazz);
    assertEventsIncluded(jvm, clazz);

    // second event class
    Class<? extends Event> clazz2 = initialize("jdk.jfr.jvm.HelloWorldEvent2");
    // the list of event classes should now have two classes registered
    assertEventsIncluded(jvm, clazz, clazz2);

    // verify that an abstract event class is not included
    Class<? extends Event> abstractClass = initialize(MyAbstractEvent.class); // to run <clinit>
    assertEventsExcluded(jvm, abstractClass);

    // verify that a class that is yet to run its <clinit> is not included in the list of event classes
    assertEventsExcluded(jvm, MyUnInitializedEvent.class);

    // ensure old classes are not lost
    assertEventsIncluded(jvm, clazz, clazz2);

    jvm.destroyNativeJFR();
}
 

public static void main(String... args) {
    FlightRecorder.getFlightRecorder();
    JVM jvm = JVM.getJVM();

    long id10 = getStackIdOfDepth(10);
    assertValid(id10);

    long id5 = getStackIdOfDepth(5);
    assertValid(id5);

    Asserts.assertNotEquals(id5, id10, "Different stack depth must return different stack trace ids");

    assertMaxSkip(jvm);
}