Converting log4j.properties to log4j.xml [duplicate]

Question

I couldn't find anywhere how to specify constants in log4j.xml. For example, I have this constant in my log4j.properties:

#Log directory
dal.log.dir=/var/log/pojodal/
# Log filename
dal.log.file=pojodal.log

And I use these constants as follows, in other parts of the properties file:

log4j.appender.DRFA1.File=${dal.log.dir}/${dal.log.file}

How to achieve the same behavior in log4j.xml?

Answer 1

You can convert your complete log4j.properties using this online service, where you can paste your log4j.properties, press convert and copy your new log4j.xml:

http://log4j-props2xml.appspot.com/

If that webapp is offline ... you can also start it in your own servlet container ... you find downloads and sources here:

https://github.com/jroyals/log4j-properties-converter/

Use of variables in log4j.xml:

This is explained in an answer to another question ... using XML internal entities here and using Java System Properties here.