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You must read this.

Then do as i told you to do.

You are using APACHE?
If yes, again compile your servlet, copy it's .CLASS file from the folder where netbeans has created project folder and in APACHE directory place it inside classes folder.

Yeah now you may run it. First not even possible whatever it was typo or....
Compile your servlet class again and put in the path....
I think you are loosing cursor when you perform some other...

I bet your query is wrong.