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Oracle Application Server 10g: J2EE Deployment and Administration Review by W Boudville
No Oracle lock in
The 10g is Oracle's answer to IBM's WebSphere and JBoss. Wessler certainly wastes no time in delineating how you can use 10g to develope J2EE applications. There are some mundane chapters on installing and configuring it. Important, granted. But the crux of the book is the chapters on making and deploying web applications, EJBs and Web Services within 10g. If you look here, 10g seems to allow for any standard J2EE application to run within it.
Crucially, suppose you commit to designing and developing one of these applications, to use 10g to hook to an Oracle database. Then your code can be largely independent of that database and 10g. In principle, you can migrate it to another J2EE compliant container, over a different database, and have only minimal changes. Realistically, your code under 10g will have all sorts of little Oracle dependencies. But this book suggests that with careful design, you can safely use 10g and still preserve a migration option. No Oracle lock in.