sb.append(obj.toString());
sb.append( obj==null?"null":obj.toString());
	private void log(Object...objects)	{		if ( log.isDebugEnabled() && objects != null && objects.length > 0)		{			StringBuilder sb = new StringBuilder(objects.length*16);			for (Object obj : objects) {				sb.append(obj.toString());			}			log.debug(sb.toString());		}	}