[SOLVED] Cannot log zwave into separate file

I’m following the instructions here
I edited the file /var/lib/openhab2/etc/org.ops4j.pax.logging.cfg as follows:

log4j.logger.org.openhab.binding.zwave = DEBUG
log4j.appender.zwave=org.apache.log4j.RollingFileAppender
log4j.appender.zwave.layout=org.apache.log4j.PatternLayout
log4j.appender.zwave.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} [%-26.26c{1}] - %m%n
log4j.appender.zwave.file=${openhab.logdir}/zwave.log
log4j.appender.zwave.append=true
log4j.appender.zwave.maxFileSize=10MB
log4j.appender.zwave.maxBackupIndex=10
log4j.logger.org.openhab.binding.zwave = DEBUG

and restarted openhab, but there is no zwave.log file, only the original events.log, openhab.log files.

tree -L 1 /var/log/openhab2/
/var/log/openhab2/
├── events.log
├── openhab.log
└── Readme.txt

Why is that?

The solution was to add

log4j.logger.org.openhab.binding.zwave = DEBUG, zwave, osgi:*
log4j.additivity.org.openhab.binding.zwave = false

After this the file /var/log/openhab2/zwave.log is created with the zwave DEBUG content

ll /var/log/openhab2/
...
-rw-r--r--  1 root    root    1973634 Mar 26 14:53 openhab.log
-rw-r--r--  1 root    root     601608 Mar 26 14:54 zwave.log