Java and docbook xsl again

I hope this is the right place for this question.  I'm not entirely sure
what's wrong, so I'm not sure who to ask.  I'm trying to use Ant's 'style'
task to transform docbook .xml into a .fo file.

I ran into a problem that I think is similar to the one described here:
http://sources.redhat.com/ml/docbook-apps/2005-q1/msg00135.html
('outside of element' and 'not a valid object reference' errors)

I tried the fix described here, which involves adding xalan.jar to the
classpath:
http://sources.redhat.com/ml/docbook-apps/2005-q1/msg00174.html

I tried both Xalan 2.4.1 and Xalan 2.6.0 with differing error messages.
I've posted the combinations of JDK and Xalan and the error messages I'm
getting on this page:

http://wiki.wendysmoak.com/cgi-bin/wiki.pl?DocBookToPDF

Is anyone successfully transforming docbook XML to FO with Java?  If so,
what combination of versions is working for you?

Thanks for any advice on this,
-- 
Wendy Smoak