docs: function Message(messageId) {
  
      if (util.isNullOrUndefined(messageId) || "string" !== typeof(messageId)) {
          throw new IllegalArgumentException();
      }
  
      /**
       * This parameter uniquely identifies a message in an XMPP connection.
       */
      this.mMessageId = messageId;
      this.mCollapseKey = null;
      this.mDelayWhileIdle = null;
      this.mTimeToLive = null;
      this.mData = null;  //Object
      this.mDryRun = null;
      this.mDeliveryReceiptRequested = false;
      this.mPriority = null;
      this.mNotification = null;
      this.mContentAvailable = false;
      this.mMutableContent = false;
  
      this.mBuilded = false;
  }