There is a web application. This application has many functions. I collected it myself. Now I want to test the application before its final launch. The application works checked myself and everything is fine. But how to check? There are special tools for this (most likely). I test it like this: it started, it works, it does not slow down. Naive method :) But how to check the server speed under load, the work of any functions, etc.?
I am using IDE NetBeans and JSF
PS: this question can not be controversial. No need to wave your hands, etc. Just give directions and I myself am already exploring.