Add descriptive message for MessagingExceptions.

We can print this message in EventuallyConsistentMapImpl rather than printing
a stack trace which doesn't add any value because the exception always comes
from the same place.

Change-Id: Ia233e7ae8605b2b59ffd4ef834209fdaa86e9376

@@ -42,17 +42,26 @@ public class MessagingException extends IOException {
      * Exception indicating no remote registered remote handler.
      */
     public static class NoRemoteHandler extends MessagingException {
+        public NoRemoteHandler() {
+            super("No remote message handler registered for this message");
+        }
     }
 
     /**
      * Exception indicating handler failure.
      */
     public static class RemoteHandlerFailure extends MessagingException {
+        public RemoteHandlerFailure() {
+            super("Remote handler failed to handle message");
+        }
     }
 
     /**
-     * Exception indicating failure due to invalid message strucuture such as an incorrect preamble.
+     * Exception indicating failure due to invalid message structure such as an incorrect preamble.
      */
-    public static class ProcotolException extends MessagingException {
+    public static class ProtocolException extends MessagingException {
+        public ProtocolException() {
+            super("Failed to process message due to invalid message structure");
+        }
     }
 }

@@ -545,7 +545,7 @@ public class NettyMessagingManager implements MessagingService {
                     } else if (message.status() == Status.ERROR_HANDLER_EXCEPTION) {
                         callback.completeExceptionally(new MessagingException.RemoteHandlerFailure());
                     } else if (message.status() == Status.PROTOCOL_EXCEPTION) {
-                        callback.completeExceptionally(new MessagingException.ProcotolException());
+                        callback.completeExceptionally(new MessagingException.ProtocolException());
                     }
                 } else {
                     log.debug("Received a reply for message id:[{}]. "

@@ -588,7 +588,8 @@ public class EventuallyConsistentMapImpl<K, V>
                 peer)
                 .whenComplete((result, error) -> {
                     if (error != null) {
-                        log.debug("Failed to send anti-entropy advertisement to {}", peer, error);
+                        log.debug("Failed to send anti-entropy advertisement to {}: {}",
+                                peer, error.getMessage());
                     } else if (result == AntiEntropyResponse.PROCESSED) {
                         antiEntropyTimes.put(peer, adCreationTime);
                     }
@@ -603,7 +604,8 @@ public class EventuallyConsistentMapImpl<K, V>
                 peer)
                 .whenComplete((result, error) -> {
                     if (error != null) {
-                        log.debug("Failed to send update request to {}", peer, error);
+                        log.debug("Failed to send update request to {}: {}",
+                                peer, error.getMessage());
                     }
                 });
     }