The Level class defines seven standardlog levels, ranging from FINEST (the lowest priority, with the lowest value) to SEVERE (the highest priority, with the highest value).
Level类中定义了7种标准日志级别,从最低的FINEST到最高的SEVERE。
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Given this default configuration, you can see that all logging of INFO and above goes to the standardlog handler file, error-0.0.log, and that all log entries are written to the trace log file.