This is something you have to carry out yourself from what I've gathered. ECPerf is the tool used to benchmark application servers. You can download it from the SUN site.
I am sorry, i think i may not explain what i want.
Because i want to use JBoss applicaton server in my new project, I want some testing result of performance, capacity, speed etc. They will help me to convince my boss using this product.
Thank you very much!