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What does %-4relative mean? I can't find a definition anywhere.
"%d{yyyy-MM-dd HH:mm:ss.SSS} %-4relative [%thread] %-5level %logger{35} - %msg%n" />
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The possible levels are, in order of precedence: TRACE, DEBUG, INFO, WARN and ERROR. Each level has a corresponding method that we use to log a message at that level. If a Logger isn't explicitly assigned a level, it inherits the level of its closest ancestor. The root logger defaults to DEBUG.
so just write %t on your configuration file in logback. xml reference document : Link and find Outputs the ID of the thread that generated the logging event. [%t] prints thread name not thread id with logback.
In logback %relative means print relative timestamp in milliseconds since the start of the aplication.
%-4 is just alignment of the element.
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