>Does anyone have any idea where to get documentation on the properties that can be set?


Well, when log4j is loading a properties configfile or an XML configfile, it does simply map the "instructions"
( be they XML or properties) to corresponding calls of setters and getters methods...
The best way to learn this is to use examples in the beginning:
Here is a simple example of configuration with the properties


For XML, here is a simple example






> Or the DTD for the XML properties?

There is
a dtd inside the distributed Jar file



>Also, where does log4j want the configuration file to live?

Basically, the idea is: You define it...

You need to use the following command in the beginning of your application in order to load the configuration file:
DOMConfigurator.configureAndWatch("filename"); - That's for XML configuration file... Use BasicConfigurator otherwise...
You can also manually load the property file in the "java" shell command execution.