-Dlog4j.configuration option is added in the ./config/factory.ini

The option -Dlog4j.configuration="file:///${SCHEDULER_HOME}/lib/log4j.properties" is added in the ./config/factory.ini so that logging with log4j finds a properties file.

... 
[java]
...
options                 = -Dlog4j.configuration="file:///${SCHEDULER_HOME}/lib/log4j.properties"
...