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Can custom appenders created for log4j (extending AppenderSkeleton) be used with new logback framework? I know that logback comes with its own set of appenders similar to log4j, but is this possible to re-use existing ones? How?
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Logback uses the same concepts as Log4j. So it's no surprise that even if they are using different file formats, their configurations are very similar. The following code snippet shows the same configuration as I used with Log4j.
Only applications using log4j-core and including user input in log messages are vulnerable. Useful explanation points: log4j-to-slf4j is an adapter between the Log4j API and SLF4J. It indeed brings log4j-api , but it does not bring log4j-core , so our starter is not affected by this vulnerability.
Appenders are named entities. This ensures that they can be referenced by name, a quality confirmed to be instrumental in configuration scripts. The Appender interface extends the FilterAttachable interface. It follows that one or more filters can be attached to an appender instance.
The following document describes how to "[migrate] custom log4j components such as appenders or layouts to logback-classic":
http://logback.qos.ch/manual/migrationFromLog4j.html
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