PropertyConfigurator.java 文件源码

private void parseErrorHandler(
  final ErrorHandler eh,
  final String errorHandlerPrefix,
  final Properties props, 
  final LoggerRepository hierarchy) {
boolean rootRef = OptionConverter.toBoolean(
              OptionConverter.findAndSubst(errorHandlerPrefix + ROOT_REF, props), false);
if (rootRef) {
          eh.setLogger(hierarchy.getRootLogger());
   }
String loggerName = OptionConverter.findAndSubst(errorHandlerPrefix + LOGGER_REF , props);
if (loggerName != null) {
    Logger logger = (loggerFactory == null) ? hierarchy.getLogger(loggerName)
                    : hierarchy.getLogger(loggerName, loggerFactory);
    eh.setLogger(logger);
}
String appenderName = OptionConverter.findAndSubst(errorHandlerPrefix + APPENDER_REF_TAG, props);
if (appenderName != null) {
    Appender backup = parseAppender(props, appenderName);
    if (backup != null) {
        eh.setBackupAppender(backup);
    }
}
}