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eStudio debugging question

We have some POJOs for doing some back-end processing while pages are built.

...xmlns:getdata="java:com.ntrs.livesite.xsl_utils.GetData"...

Within eStudio...

I would like (need) to do some debugging of the Java class GetData but for the life of me I can't find a few things:
1) if it blows up - what is the log files (path & name) where the trace, hopefully, is dumped?
2) If I use Log4J logging, where do those messages go?
3) where is the log4j setup file that I can tweak to change the logging level?