     {
         // sanity check
         if (_tcount != 0) {
-            log.warning("Transaction cleared with non-zero nesting count [dobj=" + this + "].");
+            log.warning("Transaction cleared with non-zero nesting count", "dobj", this);
             _tcount = 0;
         }
 

            _listeners = [ ];

        } else if (_listeners.indexOf(listener) != -1) {
            log.warning("Refusing repeat listener registration " +
                "[dobj=" + which() + ", list=" + listener + "].");
            log.logStackTrace(new Error());
            return;
        }
        _listeners.push(listener);

                    (listener as EventListener).eventReceived(event);
                }
            } catch (e :Error) {
                log.warning("Listener choked during notification",
                    "list", listener, "event", event, e);
            }
        }
    }
