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FtpServer uses SLF4J throughout its internal code allowing the developer to choose a logging configuration that suits their needs, e.g java.util.logging or Log4J. SLF4J provides FtpServer the ability to log hierarchically across various log levels without needing to rely on a particular logging implementation.

MDC logging

FtpServer supports MDC logging. Basically, it provides session based information for the logger. Of primary interest in the case of FtpServer are the user name and remote IP address for each session. The log4j example below shows how to enable these to be logged.

log4j

If you need to setup detailed logging from within FTP Server's code, then you can use a simple log4j configuration. Note that this logging can be very verbose depending on the log level you chose to use. The log4j jar is bundled with the binary distribution. This is an optional jar file.

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log4j.rootLogger=DEBUG, R
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=./res/log/log.gen
log4j.appender.R.MaxFileSize=10MB
log4j.appender.R.MaxBackupIndex=10
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=[%5p] %d [%X{userName}] [%X{remoteIp}] %m%n

This log4j configuration sets up a file called log.gen in your FTP Server ./res/log folder with a maximum file size of 10MB and up to 10 backups. DEBUG log level is specified.

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