message.onSend() was not being called causing the readOnly fields to not be properly initialized.

git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@394142 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/main/java/org/apache/activemq/transport/stomp/Send.java

@@ -125,6 +125,8 @@ class Send implements StompCommand {
             msg.setTransactionId(tx_id);
         }
         
+        msg.onSend();
+        
         return new CommandEnvelope(msg, headers);
     }