How to invoke a servlet using URL - http://localhost:8080/servlet/

I wrote a very simple servlet and placed it in folder: tomcat\webapps\ROOT\WEB-INF\classes\
I read there is no need to mention such servlet in web.xml. So, I didn't.
Still, I am unable to invoke my simple servlet

What am I missing? Please guide me.

Port etc. are correct. I am able to invoke other servlets.

Include ROOT in URL.

http://localhost:8080/ROOT/servlet/

ROOT is never specified! Everything under ROOT will be invoked as, for e.g. http://localhost:8080/ and NOT as http://localhost:8080/ROOT/

What is a simple servlet?
What Tomcat version?
What Servlets version?
Where did you read that you don't need to mention it in web.xml? Did you use annotations?

I must enable InvokerServlet. I am still reading the stuff present here: http://www.coderanch.com/how-to/java/InvokerServlet

Hope, it'll be useful to you as well.

Bad idea.

Bad idea - in real world.
Good idea - to learn.

Bad idea to use it, good idea to avoid it ;-)

By saying "Hope it'll be useful to you as well" I meant the article, not InvokerServlet.

Faisal Ahmad wrote:Good idea - to learn.

Nope. That's like saying smoking is a good idea "to learn". Bad habit. Don't even start.

You learn nothing by using the Invoker -- you simply get used to doing things in a way that has been demonstrated to be a bad practice. And in doing so, avoid learning how to map servlets the correct way.

@Bear,@Pedro - I completely agree with you.

By saying, "Good idea - to learn", I meant:
- learnt that there exists (tomcat v5.5.31.0) something called InvokerServlet
- learnt that there exists a way to invoke servlets through such URL
- learnt how bad such practice is (the curiosity made me read the article here and explore more about InvokerServlet at few other places as well)

I noticed, my replies were abstract!

Many thanks for your replies!