Thanks for the plug, but it was for UNIX. I answered this question in the MetaLink Forms forum. Haven't done any cookbooks for Windows because the products almost always install without a hitch and are usually pretty straightforward. For a Java-related error, check the classpath created in the default.env file (as a start).
The c:\ODS10g/forms90/server/formsweb.cfg makes me wonder because of the switcheroo in "\" to "/" in the path. And most of those parameters you pass in don't have to be - they're all configurable in the formsweb.cfg file.