javadoc fixes

Change-Id: I3b4fc2d99f42b2413a535fb411b9c19bdd186ad8
diff --git a/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
index cd2daff..283f92d 100644
--- a/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
+++ b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterCommunicationService.java
@@ -33,6 +33,7 @@
      *
      * @param message  message to send
      * @return true if the message was sent successfully to all nodes; false otherwise.
+     * @throws IOException when I/O exception of some sort has occurred
      */
     boolean broadcast(ClusterMessage message) throws IOException;
 
@@ -42,6 +43,7 @@
      * @param message  message to send
      * @param toNodeId node identifier
      * @return true if the message was sent successfully; false otherwise.
+     * @throws IOException when I/O exception of some sort has occurred
      */
     boolean unicast(ClusterMessage message, NodeId toNodeId) throws IOException;
 
@@ -49,7 +51,9 @@
      * Multicast a message to a set of controller nodes.
      *
      * @param message  message to send
+     * @param nodeIds  recipient node identifiers
      * @return true if the message was sent successfully to all nodes in the group; false otherwise.
+     * @throws IOException when I/O exception of some sort has occurred
      */
     boolean multicast(ClusterMessage message, Set<NodeId> nodeIds) throws IOException;
 
@@ -58,7 +62,7 @@
      * @param message message to send
      * @param toNodeId recipient node identifier
      * @return reply future.
-     * @throws IOException
+     * @throws IOException when I/O exception of some sort has occurred
      */
     ListenableFuture<byte[]> sendAndReceive(ClusterMessage message, NodeId toNodeId) throws IOException;
 
diff --git a/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
index 5c8550f..c820704 100644
--- a/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
+++ b/core/api/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessage.java
@@ -32,7 +32,9 @@
     /**
      * Creates a cluster message.
      *
+     * @param sender  message sender
      * @param subject message subject
+     * @param payload message payload
      */
     public ClusterMessage(NodeId sender, MessageSubject subject, byte[] payload) {
         this.sender = sender;
@@ -71,7 +73,7 @@
      * Sends a response to the sender.
      *
      * @param data payload response.
-     * @throws IOException
+     * @throws IOException when I/O exception of some sort has occurred
      */
     public void respond(byte[] data) throws IOException {
         throw new IllegalStateException("One can only repond to message recived from others.");