Security Debugging in WebLogic 9
The technique for getting debug information from the WebLogic security framework changed in WebLogic 9.x. In fact, BEA has made setting debug flags easier across the entire server.
In the console, navigate to
Servers -> AdminServer -> Debug
and note all of the goodies for which you can get debug information.
Getting back to the security framework, continue navigating to
weblogic -> security
and enable debugging for your areas of interest. Debug output is immediate after you activate the changes.
Thanks to Marky Middleton on the BEA forums for the tip!
Read Security Realm Logging in WebLogic 8.1 if you want debug output from an 8.1 server.