I always recommend making your log4j initialization a servlet that gets called upon the starting of the app.

Plus if you are using struts and if you have base classes for each the model-view-controller classes, which I recommend, you can place your logging into the base class and go from there.

If you need actual code let me know and I can post it for you (*I should make that a FAQ*).

Hope this helps.

Plus Ceki Gulcu wrote a great manual for log4j. On the log4j web site there is a link to it. It's around $35, in pdf format, and it is well worth it.