Which FOSS Java application should be used in a performance test?

I would like to write an online book that shows people how to tune a Java web application by example. Using free tools, it will show people how to load test and monitor their apps so that they can make incremental performance improvements.

I already know that I want to use Jboss + Apache + Ubuntu. I don't really care whether I use MySQL or Postgresql. I also plan on using The Grinder to run my perf tests.

Now I just need to determine which Java application I want to test. Here are my high-level requirements:

• FOSS - All of the tools in my book will be FOSS to lower the costs barrier.
• It should be fairly secure - I may expose this application to the WWW, and I don't want to lose sleep over security.
• Easy to deploy - I don't want people to spend too much time deploying the app.
• Easy to load test - I would like a fairly simple UI that avoids too much Ajax.
• DB-Backed - The app has to have a RDBMS backend.

Does anyone know开发者_开发百科 of a good Java app that would meet these requirements?

Jenkins might be a good choice. Simple to deploy, and it might have some future benefit as well :)