code: public void log(int level, String message, Throwable exception) {
          doLog(message, level, null, exception);
      }
docs: * Log a message with an exception. * The ServiceDescription field of the
  LogEntry will be set to null. *
  
  @param level
  The severity of the message. (Should be one of the * four
  predefined severities.) *
  @param message
  Human readable string describing the condition. *
  @param exception
  The exception that reflects the condition.