8009034: Improve resulting notifications in JMX

Summary: Disallowing access to mutable shared arrays
Reviewed-by: dfuchs, mchung, skoivu

src/share/classes/javax/management/remote/NotificationResult.java

@@ -89,7 +89,7 @@ public class NotificationResult implements Serializable {
 
         this.earliestSequenceNumber = earliestSequenceNumber;
         this.nextSequenceNumber = nextSequenceNumber;
-        this.targetedNotifications = targetedNotifications;
+        this.targetedNotifications = (targetedNotifications.length == 0 ? targetedNotifications : targetedNotifications.clone());
     }
 
     /**
@@ -122,7 +122,7 @@ public class NotificationResult implements Serializable {
      * listeners they correspond to.  This array can be empty.
      */
     public TargetedNotification[] getTargetedNotifications() {
-        return targetedNotifications;
+        return targetedNotifications.length == 0 ? targetedNotifications : targetedNotifications.clone();
     }
 
     /**