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sl.log.level

Sets the log level to one of the following: "off", "error", "warn", "info", "debug"

sl.log.toConsole

Set to true to enable log output to the console

sl.log.toFile

Set to true to enable log output to a file

sl.log.folder

Provide a folder to save the log files in

sl.log.filename

Provide the name of the log file

sl.log.count

Limit the number of log files to create. Default: 10

sl.log.limit

Limit the size of the log file in megabytes (MB). Default value is 10 (i.e. 10*1024 KB)

--add-opens=java.base/jdk.internal.loader=ALL-UNNAMED

Special JVM parameter to allow logging in Java 9 and later in addition to -Dsl.log.* above. 
If the option is not provided, the test listener will work as usual, but logging will not work.