Twitter uses loads of java script. So, what sort of servlet container the Twitter is using?.
Twitter’s infrastructure is very specialized and spans multiple technologies and programming languages. If your intent is to debug your Tomcat deployment, there are probably a lot of general-purpose tutorials and documentation on the web which will help. I doubt knowing about Twitter’s infrastructure would help you with your own service.
All I want to know what type of container Twitter is using :-).
There should be a container, they just don’t simply dump files in different folders!
Twitter is so large that it doesn’t work like a conventional website. There isn’t a servlet container in the way you’re expecting there to be one. If you’re really interested in the way the system is built, here’s a blogpost with a bunch of links to documents describing some of the technology which allows it to scale to millions of users: http://highscalability.com/scaling-twitter-making-twitter-10000-percent-faster
Twitter open sources some important parts of its infrastructure. You can find such projects here: https://github.com/twitter