XStream xStream = new XStream(new XppDriver());
xStream.setMode(XStream.NO_REFERENCES);
String action = xStream.toXML(vars);
WhiteBoardEvent whiteBoardEvent = new WhiteBoardEvent();
whiteBoardEvent.setStarttime(currentDate.getTime()-recordingsStartTime.getTime());
whiteBoardEvent.setAction(action);
roomRecording.getWhiteboard().add(whiteBoardEvent);
roomRecordingList.put(roomrecordingName, roomRecording);