I'm not specifically familiar with Orion, but I know that BC4J-based J2EE applications can be deployed on any J2EE-compliant application server.
Here are some links to some HOWTO articles that explain how to
deploy BC4J-powered apps to JBoss, WebLogic, and WebSphere. Of course,
deploying them to Oracle9iAS's "OC4J" container doesn't require a
HOWTO article since our JDeveloper9i IDE makes that automatic for you :-)
And for good measure, here's a link to our HOWTO on how to use BC4J to build applications that work with non-Oracle databases, too.
Hope this helps.
Steve Muench - Developer, Product Mgr, Java/XML Evangelist, Author
Simplify J2EE Development with the Oracle BC4J Framework
Dive into BC4J at http://radio.weblogs.com/0118231
Struts/BC4J Toy Store Demo http://www.geocities.com/smuench/bc4jtoystore
Building Oracle XML Apps, http://www.oreilly.com/catalog/orxmlapp