You can just create a simple web application with a loop that does lots of System.out.printlns.
Normally I discourage System.out and System.err in webapps, but the catalina.out file isn't a true logfile, so if that's what you want to process,
you should generate a lot of non-formatted messages to it if you want a proper "real-world" simulation.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.