Can't run jsp file

why i can't run my jsp file? but some of them can be run ?
i use tomcat.
this is my snippet code :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
     out.println("Hai");
%>
</body>
</html>i can't run above jsp file. why ?
am i being hacked ? i use IE 5 althought sometime i use netscape 6 or Opera 7.
i try to run another jsp file, it's succeed but with above simple jsp file, it can't.
but when i tried to run it on another computer, it runs.
HELP ME!

Once again, I HAVE SAVE IT!. and i make sure that the
file name didn't mistake.
but when i run it, the link doesn't have any link to
anywhere.Maybe your link is incorrect.
>
the other step i take, save as the file to another
name and then run it again, but it still the same.
the change i have made is useless.
Just for this file (suppose we call it trouble.jsp).
for another jsp file, when i run it, it works.
but, for this trouble.jsp, i found it very weird.Weird won't help anybody fix your problem.
>
I'll repeat once again, i have save it and make sure
the name is correct, the path is correct when i run
it.Then everything's fine, I guess.
Yes, sometime we make mistake and let other people get
the blame.
but, for this, i found it weird.The machine is only doing what you told it to do, and what you told it is quite incorrect. There's nothing weird about it.
>
according to me, i have set my tomcat very well.Maybe you aren't the best judge.
from the start i use it, it works fine and give me
result the way i expected.Then why are you posting anything here? Sounds like you know everything and that all is well.

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