code: public void send(Address dst, Object obj) throws Exception {
          ch.send(dst, obj);
      }
docs: Helper method to create a Message with given parameters and invoke {@link #send(Message)}.
  
  @param dst
  Destination address for message. If null, message will be sent to all current group
  members
  @param obj
  A serializable object. Will be marshalled into the byte buffer of the Message. If it
  is <em>not</em> serializable, an exception will be thrown
  @throws Exception
  exception thrown if message sending was not successful