how many maximum concurrent users can a tomcat instance, jboss instance and weblogic instance handle?

I am willing to launch a web application. It was completely on the structs only and no springs are used in it. We are willing to launch in either tomcat or jboss or weblogic application servers.

So, I may get many users' hits to the application. My hardware is 32GB/8cores and the OS is RHEL6.3. So, I would like to know how many maximum concurrent users can a tomcat instance handle. Similar the way, I would like to know about the maximum concurrent users that jboss-as and weblogic also handle.

Thanks in advance

Solution

First, it's not structs, it's "Struts" and no springs but "Spring". Although you have provided your hardware configuration, I would strongly suggest you to use JMeter to do the load testing of your application in your production environment before going live. That would give you a better picture rather than calculating on theories. Look here https://www.digitalocean.com/community/tutorials/how-to-use-apache-jmeter-to-perform-load-testing-on-a-web-server