Where to inspect servlet exceptions in tomcat

Question

A very simple question (pardon) - if a servlet throws ServletException and it runs in Tomcat - where can I inspect the exception details? Tried to look under logs but nothing is there. I probably miss something very obvious. I do not use (and at this stage don't plan to use) any log library (such as log4j), just throwing an exception and trying to see it if possible.

Appreciate!