chore(jmc-core): update RJMX sources

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/internal/DefaultConnectionHandle.java

@@ -71,7 +71,7 @@ public class DefaultConnectionHandle implements IConnectionHandle {
 	public DefaultConnectionHandle(RJMXConnection connection, String description, IConnectionListener[] listeners) {
 		this.connection = connection;
 		this.description = description;
-		this.listeners = listeners;
+		this.listeners = listeners == null ? new IConnectionListener[0] : listeners;
 		registerDefaultServices();
 	}
 

src/main/java/org/openjdk/jmc/rjmx/services/ICommercialFeaturesService.java

@@ -52,4 +52,9 @@ public interface ICommercialFeaturesService {
 	 */
 	void enableCommercialFeatures() throws Exception;
 
+	/**
+	 * @return true if there are commercial features available, or false if this JVM doesn't have
+	 *         commercial features.
+	 */
+	boolean hasCommercialFeatures();
 }

src/main/java/org/openjdk/jmc/rjmx/services/internal/CommercialFeaturesServiceFactory.java

@@ -52,7 +52,7 @@ public ICommercialFeaturesService getServiceInstance(IConnectionHandle handle)
 		if (descriptor != null) {
 			JavaVersion version = new JavaVersion(descriptor.getJavaVersion());
 			if (version.getMajorVersion() >= 11) {
-				return new Jdk11CommercialFeaturesService();
+				return new NoCommercialFeaturesService();
 			}
 		}
 		return new HotSpot23CommercialFeaturesService(handle);

src/main/java/org/openjdk/jmc/rjmx/services/internal/HotSpot23CommercialFeaturesService.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * 
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -43,7 +43,7 @@
 import javax.management.ObjectName;
 
 public class HotSpot23CommercialFeaturesService implements ICommercialFeaturesService {
-	private final static String VM_FLAG = "UnlockCommercialFeatures"; //$NON-NLS-1$
+	private final static String UNLOCK_COMMERCIAL_FEATURES_FLAG = "UnlockCommercialFeatures"; //$NON-NLS-1$
 	private final static String UNLOCK_COMMAND = "VM.unlock_commercial_features"; //$NON-NLS-1$
 	private final MBeanServerConnection server;
 	private final IDiagnosticCommandService dcs;
@@ -54,7 +54,7 @@ public HotSpot23CommercialFeaturesService(IConnectionHandle handle)
 		server = handle.getServiceOrThrow(MBeanServerConnection.class);
 		dcs = handle.getServiceOrNull(IDiagnosticCommandService.class);
 		try {
-			HotspotManagementToolkit.getVMOption(server, VM_FLAG); // Will fail if option is not available
+			HotspotManagementToolkit.getVMOption(server, UNLOCK_COMMERCIAL_FEATURES_FLAG); // Will fail if option is not available
 		} catch (Exception e) {
 			// Commercial Feature option is not available but Flight Recorder is.
 			if (!isJfrMBeanAvailable()) {
@@ -66,7 +66,8 @@ public HotSpot23CommercialFeaturesService(IConnectionHandle handle)
 	@Override
 	public boolean isCommercialFeaturesEnabled() {
 		try {
-			return ((String) HotspotManagementToolkit.getVMOption(server, VM_FLAG)).contains("true"); //$NON-NLS-1$
+			return ((String) HotspotManagementToolkit.getVMOption(server, UNLOCK_COMMERCIAL_FEATURES_FLAG))
+					.contains("true"); //$NON-NLS-1$
 		} catch (Exception e) {
 			return false;
 		}
@@ -78,7 +79,7 @@ public void enableCommercialFeatures() throws Exception {
 			dcs.runCtrlBreakHandlerWithResult(UNLOCK_COMMAND);
 		}
 		if (!isCommercialFeaturesEnabled()) {
-			HotspotManagementToolkit.setVMOption(server, VM_FLAG, "true"); //$NON-NLS-1$
+			HotspotManagementToolkit.setVMOption(server, UNLOCK_COMMERCIAL_FEATURES_FLAG, "true"); //$NON-NLS-1$
 		}
 	}
 
@@ -96,4 +97,9 @@ private ObjectName getJfrMBeanObjectName() throws Exception {
 		server.getMBeanInfo(candidateObjectName);
 		return candidateObjectName;
 	}
-}
+
+	@Override
+	public boolean hasCommercialFeatures() {
+		return true;
+	}
+}

src/main/java/org/openjdk/jmc/rjmx/services/internal/Jdk11CommercialFeaturesService.java → src/main/java/org/openjdk/jmc/rjmx/services/internal/NoCommercialFeaturesService.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * 
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -34,8 +34,11 @@
 
 import org.openjdk.jmc.rjmx.services.ICommercialFeaturesService;
 
-public class Jdk11CommercialFeaturesService implements ICommercialFeaturesService {
-
+/**
+ * Used by JVMs with no commercial features, e.g. OpenJDK 8 and JDK 11+ JVMs.
+ */
+public class NoCommercialFeaturesService implements ICommercialFeaturesService {
+
 	@Override
 	public boolean isCommercialFeaturesEnabled() {
 		return true;
@@ -45,4 +48,9 @@ public boolean isCommercialFeaturesEnabled() {
 	public void enableCommercialFeatures() throws Exception {
 		// Noop
 	}
-}
+
+	@Override
+	public boolean hasCommercialFeatures() {
+		return false;
+	}
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * 
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -103,17 +103,22 @@ public String getVersion() {
 	}
 
 	private boolean isDynamicFlightRecorderSupported(IConnectionHandle handle) {
-		return ConnectionToolkit.isHotSpot(handle)
-				&& ConnectionToolkit.isJavaVersionAboveOrEqual(handle, JavaVersionSupport.DYNAMIC_JFR_SUPPORTED);
-	}
+		// 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);
+        }
 
-	private boolean isFlightRecorderCommercial() {
-		return ConnectionToolkit.isHotSpot(connection)
-				&& !ConnectionToolkit.isJavaVersionAboveOrEqual(connection, JavaVersionSupport.JFR_NOT_COMMERCIAL);
+		return !cfs.hasCommercialFeatures() || (ConnectionToolkit.isHotSpot(handle)
+				&& ConnectionToolkit.isJavaVersionAboveOrEqual(handle, JavaVersionSupport.DYNAMIC_JFR_SUPPORTED));
 	}
 
 	private boolean isFlightRecorderDisabled(IConnectionHandle handle) {
-		if (cfs != null && isFlightRecorderCommercial()) {
+        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);
@@ -126,10 +131,11 @@ public static boolean isAvailable(IConnectionHandle handle) {
 
 	public FlightRecorderServiceV2(IConnectionHandle handle) throws ConnectionException, ServiceNotAvailableException {
 		cfs = handle.getServiceOrThrow(ICommercialFeaturesService.class);
+
 		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;
@@ -480,7 +486,7 @@ public InputStream openStream(IRecordingDescriptor descriptor, IQuantity lastPar
 	@Override
 	public boolean isEnabled() {
 		if (!wasEnabled) {
-			boolean isEnabled = isFlightRecorderCommercial() ? cfs.isCommercialFeaturesEnabled()
+			boolean isEnabled = cfs.hasCommercialFeatures() ? cfs.isCommercialFeaturesEnabled()
 					: isAvailable(connection);
 			if (isEnabled) {
 				wasEnabled = true;