Where is the error log for MyFaces in Tomcat?

[Adam]

Dear All,

I have just started playing with Tomcat & MyFaces.
Std downloaded tomcat 5.5.12.

The problem is that when I get an error I get told:

" The full stack trace of the root cause is available in the Apache 
Tomcat/5.5.12 logs."


But.....I can not see anything in the logs. Does MyFaces make it's own 
file? Does it use/require log4J?


TIA

Adam