According to the documentation at
http://logging.apache.org/log4cxx/manual/Introduction.html#DefaultInitializationProcedure
I should be able to create a file called log4cxx.properties or log4cxx.xml with configuration information and it will be loaded by the log4cxx library. Right now the only way I could get it to work was to use a log4j.properties or log4j.xml.
I don't know if this was an oversight on the part of the development, or documentation.