Enabling BI Publisher 10g to DEBUG mode is pretty simple. I will show you how to do it in OC4J.
1. Stop OC4J
2. Make a backup of this file:
C:\OracleBI\xmlp\XMLP\Admin\Configuration\xmlp-server-config.xml
3. Modify the file xmlp-server-config.xml and set this value:
<property name="DEBUG_LEVEL" value="debug"/>
4. Save the file
5. Restart OC4J
It should be now in Debug mode
