A DESCRIPTION OF THE PROBLEM :
When accessing FlightRecorderMXBean#getRecordings() through an MBeanServerConnection there will be a ClassCastException when creating the RecordingInfo objects:

java.lang.ClassCastException: class java.lang.Long cannot be cast to class java.lang.Integer

The reason is that the constructor in RecordingInfo tries to cast the "id" from the CompositeData, which is a java.lang.Long into an int.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute this method with a valid JMX Service URL:

public static List<RecordingInfo> getRecordingInfos(String jmxServiceUrl) throws Exception {
    JMXConnector jmxConnector = JMXConnectorFactory.connect(new JMXServiceURL(jmxServiceUrl));
    MBeanServerConnection mBeanServerConnection = jmxConnector.getMBeanServerConnection();

    ObjectName objectName = new ObjectName("jdk.management.jfr:type=FlightRecorder");
    FlightRecorderMXBean flightRecorder = JMX.newMXBeanProxy(mBeanServerConnection, objectName, FlightRecorderMXBean.class);

    return flightRecorder.getRecordings();
  }

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The above method should return a list of RecordingInfo.
ACTUAL -
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
	at com.sun.proxy.$Proxy0.getRecordings(Unknown Source)
	at com.example.Main.main(Main.java:32)
Caused by: java.io.InvalidObjectException: Failed to invoke from(CompositeData)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory.invalidObjectException(DefaultMXBeanMappingFactory.java:1437)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$CompositeBuilderViaFrom.fromCompositeData(DefaultMXBeanMappingFactory.java:1024)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$CompositeMapping.fromNonNullOpenValue(DefaultMXBeanMappingFactory.java:922)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$NonNullMXBeanMapping.fromOpenValue(DefaultMXBeanMappingFactory.java:134)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$CollectionMapping.fromNonNullOpenValue(DefaultMXBeanMappingFactory.java:665)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$NonNullMXBeanMapping.fromOpenValue(DefaultMXBeanMappingFactory.java:134)
	at java.management/com.sun.jmx.mbeanserver.ConvertingMethod.fromOpenReturnValue(ConvertingMethod.java:131)
	at java.management/com.sun.jmx.mbeanserver.MXBeanProxy.invoke(MXBeanProxy.java:168)
	at java.management/javax.management.MBeanServerInvocationHandler.invoke(MBeanServerInvocationHandler.java:258)
	... 2 more
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.base/sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:260)
	at java.management/com.sun.jmx.mbeanserver.DefaultMXBeanMappingFactory$CompositeBuilderViaFrom.fromCompositeData(DefaultMXBeanMappingFactory.java:1021)
	... 9 more
Caused by: java.lang.ClassCastException: class java.lang.Long cannot be cast to class java.lang.Integer (java.lang.Long and java.lang.Integer are in module java.base of loader 'bootstrap')
	at jdk.management.jfr/jdk.management.jfr.RecordingInfo.<init>(RecordingInfo.java:91)
	at jdk.management.jfr/jdk.management.jfr.RecordingInfo.from(RecordingInfo.java:396)
	... 20 more

---------- BEGIN SOURCE ----------
import java.util.List;
import javax.management.JMX;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import com.sun.tools.attach.VirtualMachine;
import jdk.management.jfr.FlightRecorderMXBean;
import jdk.management.jfr.RecordingInfo;

public class Main {

  public static void main(String[] args) throws Exception {
    // Use the PID of a running JVM
    String pid = args[0];
    VirtualMachine vm = VirtualMachine.attach(pid);

    String jmxServiceUrl = vm.startLocalManagementAgent();
    List<RecordingInfo> recordings = getRecordingInfos(jmxServiceUrl);
    System.out.println(recordings);
  }

  private static List<RecordingInfo> getRecordingInfos(String jmxServiceUrl) throws Exception {
    JMXConnector jmxConnector = JMXConnectorFactory.connect(new JMXServiceURL(jmxServiceUrl));
    MBeanServerConnection mBeanServerConnection = jmxConnector.getMBeanServerConnection();

    ObjectName objectName = new ObjectName("jdk.management.jfr:type=FlightRecorder");
    FlightRecorderMXBean flightRecorder = JMX.newMXBeanProxy(mBeanServerConnection, objectName, FlightRecorderMXBean.class);

    return flightRecorder.getRecordings();
  }

}
---------- END SOURCE ----------

FREQUENCY : always