Does Fast Scala Compiler (fsc) work with mixed sources?

I have some Scala source that is using some Java source.
I have fsc working (i.e. I got past the CompileSocket problem), but I am getting compile errors in .java files that I do not get when I do not use fsc.

So, is it possible to use fsc with mixed sources?
Is there something special I need to do to get it to work?
Is this a bug that I should log?