How to put debug logs?

I am building a webcenter portal using Oracle Webcenter 11.1.1.1.5 and deploying on Oracle Weblogic Server 11g. Please suggest what is the best practice to use for application debug logs. Should I use log4j or Apache commons library? Is it possible to manage the logs (enable/ disable/ change severity) of the logs using WLS admin console?

In a production (or even test environment) you can use the enterprise manager of weblogic to analyse the error log files. I believe this is done by using Log4j.
For each application you can request the logs based upon severity.
Here's some information about the weblogic logging system: http://download.oracle.com/docs/cd/E21764_01/web.1111/e13739/toc.htm
I can't seem to find the documentation about the enterprise manager... I'll see if i can find the documentation and update the post.
Otherwhise i have written a section about the log files in my book: http://www.packtpub.com/oracle-webcenter-11g-ps3-administration-cookbook/book in the chapter managing webcenter applications. I show how you can analyse and filter messages in the log.

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