feat(jmx): check for SubstrateVM and whether JFR is available

Co-authored-by: Robert Toyonaga <rtoyonag@redhat.com>

src/main/java/org/openjdk/jmc/rjmx/ConnectionToolkit.java

@@ -365,6 +365,9 @@ public static boolean isHotSpot(IConnectionHandle connectionHandle) {
 		return vmName != null && JavaVMVersionToolkit.isHotspotJVMName(vmName);
 	}
 
+    public static boolean isSubstrateVm(IConnectionHandle connectionHandle) {
+        return getVMName(connectionHandle).equals("Substrate VM");
+    }
 	/**
 	 * Returns {@code true} if the connection handle is associated with an Oracle built JVM,
 	 * {@code false} otherwise. If the information is already present in the {@link JVMDescriptor},

src/main/java/org/openjdk/jmc/rjmx/services/jfr/internal/FlightRecorderServiceV2.java

@@ -105,12 +105,20 @@ public String getVersion() {
 	private boolean isDynamicFlightRecorderSupported(IConnectionHandle handle) {
 		// All OpenJDK versions of JFR support dynamic enablement of JFR, so if there are no commercial features in play
 		// all is A-OK.
+        if (ConnectionToolkit.isSubstrateVm(handle)){
+            // JFR may not have been built into the native image. Check that FlightRecorderMXBean is accessible from the MBean server.
+            return isAvailable(handle);
+        }
+
 		return !cfs.hasCommercialFeatures() || (ConnectionToolkit.isHotSpot(handle)
 				&& ConnectionToolkit.isJavaVersionAboveOrEqual(handle, JavaVersionSupport.DYNAMIC_JFR_SUPPORTED));
 	}
 
 	private boolean isFlightRecorderDisabled(IConnectionHandle handle) {
-		if (cfs != null && cfs.hasCommercialFeatures()) {
+        if (ConnectionToolkit.isSubstrateVm(handle)){
+            // For SVM commercial features may be available but disabled and JFR is still enabled
+            return !isAvailable(handle);
+        } else if (cfs != null && cfs.hasCommercialFeatures()) {
 			return !cfs.isCommercialFeaturesEnabled() || JVMSupportToolkit.isFlightRecorderDisabled(handle, false);
 		} else {
 			return JVMSupportToolkit.isFlightRecorderDisabled(handle, false);
@@ -127,7 +135,7 @@ public FlightRecorderServiceV2(IConnectionHandle handle) throws ConnectionExcept
 		if (!isDynamicFlightRecorderSupported(handle) && isFlightRecorderDisabled(handle)) {
 			throw new ServiceNotAvailableException(""); //$NON-NLS-1$
 		}
-		if (JVMSupportToolkit.isFlightRecorderDisabled(handle, true)) {
+		if (!ConnectionToolkit.isSubstrateVm(handle) && JVMSupportToolkit.isFlightRecorderDisabled(handle, true)) {
 			throw new ServiceNotAvailableException(""); //$NON-NLS-1$
 		}
 		connection = handle;