The ActionServlet's log(String, int) method typically sends the log messages to the stdout log, as long as you have declared the init debug parameter >= the int value passed in. However, as it is actually calling the log method inherited from GenericServlet, this is dependent on your servlet container. You can see the javax.servlet API docs for more info.
"Write beautiful code; then profile that beautiful code and make little bits of it uglier but faster." --The JavaPerformanceTuning.com team, Newsletter 039.