Debug jsp on 9ias

We need to debug a deployed jsp that uses java beans. It works fine in jdeveloper but we get null pointer exceptions when deployed and accessed via internet explorer. Strangely, it seems not to happen when we use netscape.
The jsp/java beans app is in jdevleoper 9.0.3.1 (windows 2000).
I have deployed the application to Oracle 9ias java edition (9.0.3) on Red Hat Linux.
I know how to modify the project settings in jdeveloper for remote debugging.
I have set the oc4j_home oc4j container properties to "debug mode" and "emit debug info" on 9ias server through the enterprise manager web site.
when I start debug mode in jdeveloper I am prompted for the host name and port number for the remote debug session. What port do I use ? Do I need to do something to start 9ias at a certain port ?
Jgalt

Try this JavaOne presentation:
http://servlet.java.sun.com/javaone/javaone2000/event.jsp?eventId=1569&trackId=7&eventType=TS&ts=1025021896743
Starting at slide 12, there are technical details on configuring Apache/JServ for remote debugging of JSPs. If you want to use JDev9i for debugging Apache/JServ, you'll need to substitute updated jars for the jars that are shown in the slides.

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