Today I checked out the newly-free javac and built it with (heresy?) Eclipse. Aside from waiting for it to build (this machine is a bit over-taxed at the moment), this only took a few minutes to set up.
I read through it a little bit, but not extensively. Overall it seems well done… easy to read, has a reasonable amount of javadoc, the big-picture layout is easy to follow, it uses generics throughout, etc.
I’m not sure what I was expecting really. Something more painful I suppose; I think I assume that all programs will be a pain to set up and build. It helps, of course, that Andrew and others got there earlier and put some needed support code into Classpath 
It doesn’t look outrageously hard to add code to support using javac as a front end to gcj, the way we’re using ecj right now.
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