Could anyone provides me some solution?
I encountered "HTTP 500 internal server error" while testing a jsp that
forwards to an error page whenever user inputs a wrong data type on a web form
to sum 2 inputted numbers. The application server version I am using is
JBoss 4.0.5.GA application server.
My Calculate3_html.jsp file is:
<HTML>
| <HEAD><TITLE>Calculator</TITLE></HEAD>
| <BODY>
|
| <%@ include file="Calculate3Header.html" %>
| <P>Enter 2 nos. and click the Calculate button.
| <p>
| <FORM METHOD=GET ACTION=Calculate3.jsp>
| <INPUT TYPE=TEXT NAME=Value1><BR>
| <INPUT TYPE=TEXT NAME=Value2><BR>
| <INPUT TYPE=SUBMIT VALUE=Calculate>
| </FORM>
| </BODY></HTML>
My Calculate3.jsp file is:
<%@ page language="java" pageEncoding="UTF-8" errorPage="Calculate3Error.jsp"
%>
|
| <%!
| // No try/catch for NumberFormatException
| private double toDouble(String value) {
| return Double.parseDouble(value);
| }
| %>
|
| <%
| double value1 = toDouble(request.getParameter("Value1"));
| double value2 = toDouble(request.getParameter("Value2"));
| double sum = value1 + value2;
| %>
|
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
| <html>
| <head>
| </head>
|
| <body>
|
| <%@ include file="Calculate3Header.html" %>
|
|
| The sum of <%= value1 %> and <%= value2 %> is <%= sum %>
| </body>
| </html>
My Calculate3Header.html file is:
<H1><I>A Simple Calculator (Exercise 3)</I></H1>
My Calculate3Error.jsp file is:
<%@ page language="java" pageEncoding="UTF-8" isErrorPage="true" %>
|
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
| <html>
| <head>
| </head>
|
| <body>
|
| <%@ include file="Calculate3Header.html" %>
|
|
|
| Calculate3Error.jsp reported the following error:
| <I><%= exception %></I>
| <br>
| <a href="Calculate3_html.jsp">Click here to try again</a>
| </body>
| </html>
Thank you.
Calson
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