Error while accessing UIX pages when deployed using OC4J

UIX: 2.1.9
JDeveloper: 9.0.3
Database: 8i Release 3.
Using UIX and BC4J, I created few pages for a small application. I installed the OC4J standalone and configured setting library paths and and deployed this application. I extended the UixPageBroker and TrivialPageFlow engine to suit my application requirements. All pages within the application requires the user to login. While accessing a UIX page, I am getting the error provided below. However, if I am not extending the UixPageBroker and PageFlowEngine, UIX pages are rendered with no problem. Can someone tell me what is the cause of this?
500 Internal Server Error
java.lang.NullPointerException
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].naming.ContextClassLoader.loadClass(ContextClassLoader.java:135)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].naming.ContextClassLoader.loadClass(ContextClassLoader.java:135)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at oracle.bali.share.util.ClassLoaderUtils.loadClass(Unknown Source)
     at oracle.bali.share.util.ClassLoaderUtils.loadClass(Unknown Source)
     at oracle.cabo.servlet.UIXServlet.init(Unknown Source)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpApplication.loadServlet(HttpApplication.java:1956)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpApplication.findServlet(HttpApplication.java:4355)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2484)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:617)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
     at com.evermind[Oracle9iAS (9.0.3.0.0) Containers for J2EE].server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:797)
     at java.lang.Thread.run(Unknown Source)

I found out the workaround but not sure whether it is the right solution.
When the application is deployed, it will be creating few files under the directory "application-deployments", of which some are configuration files specific to the deployed application.
Edit the file: orion-web.xml and uncomment the following:
<web-app-class-loader search-local-classes-first="true" include-war-manifest-class-path="true" />Save the file and restart OC4J.

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