problem in jsp !!!

Hai everybody,
I m getting the problem in jsp so please help me out!!!
<%@ page language ="java"%>
<%@ page import = "java.io.*"%>
<HTML>
<HEAD>
<TITLE>Invoice process </TITLE>
</HEAD>
<BODY>

<tr><td align=right><h2> Item Unit price Quantity SubTotal </h2></td>
</tr><br><br>
<%!
String x="0";
String y="0";
String z="0";
double t1;
double t2;
double t3;

%>
<%

x = request.getParameter("cd");
y= request.getParameter("flopy");
z = request.getParameter("cdmusic");

t1 = (Integer.parseInt(x)) * 0.50;
t2 = (Integer.parseInt(y)) * 10.99;
t3 = (Integer.parseInt(z)) * 15.50;

%>
CDR $0.50 <%= t1 %><br><br>

Disks$10.99 <%= t2 %><br><br>

Music$15.50 <%= t3 %><br>

</BODY>
</HTML>

Originally posted by ramakrishna pydipati:
please help me out!!!

Sure. But how can you expect people to help you, when you don't tell what the problem is!?

hai sorry about it.
it is giving null error.

I think, the attributes cd, flopy & cdmusic are not set properly.
How are you calling the JSP? Straight from the browser or from a different JSP or Servlet?

I am calling from HTML page (project6.html)
<HTML>
<HEAD>
<TITLE>Invoice</TITLE>
</HEAD>
<BODY>
<form action="project6.jsp" method="POST" >

<table align=center >
<tr><td align=right> Specify the quantity you want to buy :</td>
</tr>
<tr><td colspan=2><hr width=400></td>
</tr>
<tr><td align=left>CD Writer: $0.50/each</td>
<td align=left><input type=text name="cd" size=7></td>
</tr>
<tr><td align=left>Floppy Disks: $10.99/package:</td>
<td align=left><input type=text name="flopy" size=7></td>
</tr>
<tr><td align=left>Music CD: $15.50/each</td>
<td align=left><input type=text name="cdmusic" size=7></td>
</tr>
<tr><td colspan=2 align=right><input type=submit value="Submit">
<input type=reset value="Reset"></td>
</tr>
<tr><td colspan=2><hr width=400></td>
</tr>
</table>
</form>
</BODY>
</HTML>

Mmmm...I don't find any problem with the code. :roll:
Is it happening always or only if you leave any of the input field empty? And make sure that all the names or spelled in the same way in both JSP & HTML (for example, is it flopy in both JSP & HTML?)
Probably you can paste the entire exception.

always it is giving out put as 0 in jsp page and nothing is getting printed
in html page.
this is my htmlpg:
<HTML>
<HEAD>
<TITLE>Invoice</TITLE>
</HEAD>
<BODY>
<form action="project6.jsp" method="POST" >

<table align=center >
<tr><td align=right> Specify the quantity you want to buy :</td>
</tr>
<tr><td colspan=2><hr width=400></td>
</tr>
<tr><td align=left>CD Writer: $0.50/each</td>
<td align=left><input type=text name="cd" size=7></td>
</tr>
<tr><td align=left>Floppy Disks: $10.99/package:</td>
<td align=left><input type=text name="flopy" size=7></td>
</tr>
<tr><td align=left>Music CD: $15.50/each</td>
<td align=left><input type=text name="cdmusic" size=7></td>
</tr>
<tr><td colspan=2 align=right><input type=submit value="Submit">
<input type=reset value="Reset"></td>
</tr>
<tr><td colspan=2><hr width=400></td>
</tr>
</table>
</form>
</BODY>
</HTML>
this is jsp page:
<%@ page language ="java"%>
<%@ page import = "java.io.*"%>
<HTML>
<HEAD>
<TITLE>Invoice process </TITLE>
</HEAD>
<BODY>

<tr><td align=right><h2> Item Unit price Quantity SubTotal </h2></td>
</tr><br><br>
<%!
String x;
String y;
String z;
double t1;
double t2;
double t3;

%>
<%

x = request.getParameter("cd");
if (request.getParameter("cd")!=null)
{
x= request.getParameter("cd");}
else
{
x= "0";
}

y= request.getParameter("flopy");
if (request.getParameter("flopy")!=null)
{
y= request.getParameter("flopy");}
else
{
y= "0";
}
z = request.getParameter("cdmusic");
if (request.getParameter("cdmusic")!=null)
{
z= request.getParameter("cdmusic");}
else
{
z= "0";
}

%>

<%
t1 = (Integer.parseInt(x)) * 0.50;
t2 = (Integer.parseInt(y)) * 10.99;
t3 = (Integer.parseInt(z)) * 15.50;
%>

CDR $0.50: <%= t1 %><br><br>

Disks$10.99: <%= t2 %><br><br>

Music$15.50: <%= t3 %><br>

</BODY>
</HTML>

nothing wrong with the code html and jsp... tried on my mc.. works well
no problems about that,
i am using Tomcat 4.0.

<%@ page language ="java"%>
<%@ page import = "java.io.*"%>
========
In a single page u cannotgive mor than one page directive declaration...

In a single page u cannotgive mor than one page directive declaration...

That is not correct. There are some clauses that you cannot repeat (such as language), but you can have as many page directives as you want for the repeatable clauses such as import.
bear

Hi
I tested your pages and currently iam using Tomcat4.1 and its working fine and i dont find any null error.
may be you need to check once again and what server are you using now.
have a nice time

Hi ramakrishna pydipati :
I advice you put print statement in your code to enable you know precisely which variable is throwing the null pointer exception; that will help you resolve the problem.
anselm