Nortel Web Center Portal Installation And Administration Manual page 566

Customizing the Customer Interface
You can also modify the LOG4J.properties file to change the various parameters
under which the logging is performed, such as the location of the output log file.
To do this, or to override the configuration programmatically from within your
code, consult the LOG4J documentation (http://jakarta.apache.org/log4j/docs/).
ATTENTION
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If you do not configure the LOG4J as detailed, the
Symposium Web Center Portal components still function
normally, but no logging is provided. You must enable
logging to receive support from Nortel Networks for any
third-party applications using Java business objects.
Nortel Networks Symposium Web Center Portal
Standard 2.0