code: public void tracev(String format, Object param1) {
          if (isEnabled(Level.TRACE)) {
              doLog(Level.TRACE, FQCN, format, new Object[] { param1 }, null);
          }
      }
docs: Issue a log message with a level of TRACE using {@link java.text.MessageFormat}-style formatting.
  
  @param format the message format string
  @param param1 the sole parameter