<p>I'm running Oracle 10g and have columns with Type_Name </p>

<pre>TIMESTAMP(6) WITH TIME ZONE</pre> 

<p>When inflated into java classes they come out as</p>

<pre>oracle.sql.TIMESTAMPTZ </pre>

<p>But DbUnit can't handle converting Oracle specific classes to Strings for writing to XML. I'm wondering if there's any easy way for me to convert (say, in my SELECT statement somehow) from these Oracle specific timestamps to something in java.sql.</p>

Try messing with the device information settings, in particular the HumanReadiblePdf attribute.
http://msdn.microsoft.com/en-us/library/ms154682.aspx
IIRC the setting is actually the opposite of what the documentation hints at compression wise.
Also take a look here:
http://blogs.msdn.com/donovans/pages/reporting-services-pdf-renderer-faq.aspx