BIRT viewer with Tomcat and IIS (using isapi)

Migrateduser

We've been successfully using the standard BIRT report viewer directly through Tomcat for several months. In order to integrate the BIRT reports with the rest of our website, we've set up the IIS/Tomcat connector (isapi_redirect). This is working with .jsp files.

However, when I redirect from IIS to the BIRT report viewer, it initially looks like it's working (brings up the Parameter dialog for the report, all of the search terms are there, etc.) but then fails after I submit the search parameters with the following error:

Exception
org.xml.sax.SAXParseException: Premature end of file.

The "Show Exception Stack Trace" is blank.

I'm at a bit of a loss how to proceed from here. No error messages are showing up in the IIS or Tomcat log directories. Any suggestions or advice would be much appreciated!

Tomcat 5.5, IIS 5.1, Windows XP Professional SP2, and BIRT runtime 2.5.0

Thanks,
Chelsea