This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I dont know how to work with Log4j but i do know one thing that when i encounter a runtime exception when executing applications in Tomcat, the details of the exception such as the stack trace are available in the logs directory of Apache. I believe this feature is application server specific and is different from the Log4j logging features.
Kindly let me know if i am mistaken in any way. Thanks.