Hello everyone,
I am trying to display an error page if user enters a wrong number. The
number has to be between 1 an d 10. I get following error:
type Exception report
message
description The server encountered an internal error () that prevented it
from fulfilling this request.
exception
LuckyException
at LuckyNumber1Servlet.validate_number(Unknown Source)
at LuckyNumber1Servlet.doGet(Unknown Source)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
Folks, I tried various ways to fix this issue. spent many hours searching
thru books and internet, but could not find a way out.
Can someone please point out the bug here?
Thanks
Raju Lokhande
*********************************************************************************************************
Here is my servlet code:
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* This is a simple example of an HTTP Servlet. It responds to the GET
* method of the HTTP protocol.
*/
public class LuckyNumber1Servlet extends HttpServlet
{
private int inp_int;
public void init() throws ServletException {
ServletContext servletContext = getServletContext();
servletContext.setAttribute("ServletTotal", new
Integer(0));
} // end of init
public void validate_number(String in_str) throws LuckyException {
inp_int = Integer.parseInt( in_str );
if ( inp_int < 1 || inp_int > 10 )
throw new LuckyException();
}
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setBufferSize(8192);
PrintWriter out = response.getWriter();
// then write the data of the response
out.println("<html>" +
"<head><title>Hello</title></head>");
// then write the data of the response
out.println("<body bgcolor=\"#ffffff\">" +
"<img src=\"duke.waving.gif\">" +
"<h2>My lucky number is 7. What's yours?</h2>" +
"<form method=\"get\">" +
"<input type=\"text\" name=\"lnumber\" size=\"25\">" +
"<p></p>" +
"<input type=\"submit\" value=\"Submit\">" +
"<input type=\"reset\" value=\"Reset\">" +
"</form>");
String lnumber = request.getParameter("lnumber");
Integer SessionTotal;
int temp_int;
if ( lnumber != null && lnumber.length() > 0 ) {
try {
validate_number( lnumber );
}
catch ( LuckyException not_ignored) {
response.resetBuffer();
throw new ServletException( not_ignored ) ;
}
HttpSession session = request.getSession( true );
synchronized(session) {
SessionTotal =
(Integer) session.getAttribute
( "SessionTotal");
if ( SessionTotal == null )
SessionTotal = new Integer(0);
temp_int = SessionTotal.intValue() ;
int temp_count = temp_int + Integer.parseInt(
lnumber);
Integer temp_integer = new Integer( temp_count);
session.setAttribute ( "SessionTotal", temp_integer
);
}
ServletContext servletContext = getServletContext
();
Integer ServletTotal =
(Integer) servletContext.getAttribute
("ServletTotal");
if ( ServletTotal == null )
ServletTotal = new Integer( 0 );
int temp_int2 = ServletTotal.intValue() ;
int temp_count2 = temp_int2 + Integer.parseInt(
lnumber);
Integer temp_integer2 = new Integer( temp_count2 );
servletContext.setAttribute("ServletTotal",
temp_integer2);
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher
("/lucky2");
if (dispatcher != null)
dispatcher.include(request, response);
}
out.println("</body></html>");
out.close();
} // end of doGet().
public String getServletInfo() {
return "The LuckyNumber1Servlet servlet types a number.";
}
} // end of class LuckyNumber1Servlet
*********************LuckyException.java *******************************
import javax.servlet.*;
public class LuckyException extends ServletException {
public LuckyException () { }
/*
public LuckyException (String msg) {
super(msg);
}
*/
}
*********************web.xml file under /appication-context/web/WEB-INF
*******************************
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"; xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation
="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
<display-name>hello1</display-name>
<servlet>
<display-name>GreetingServlet</display-name>
<servlet-name>GreetingServlet</servlet-name>
<servlet-class>GreetingServlet</servlet-class>
</servlet>
<servlet>
<display-name>ResponseServlet</display-name>
<servlet-name>ResponseServlet</servlet-name>
<servlet-class>ResponseServlet</servlet-class>
</servlet>
<servlet>
<display-name>LuckyNumber1Servlet</display-name>
<servlet-name>LuckyNumber1Servlet</servlet-name>
<servlet-class>LuckyNumber1Servlet</servlet-class>
</servlet>
<servlet>
<display-name>LuckyNumber2Servlet</display-name>
<servlet-name>LuckyNumber2Servlet</servlet-name>
<servlet-class>LuckyNumber2Servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GreetingServlet</servlet-name>
<url-pattern>/greeting</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ResponseServlet</servlet-name>
<url-pattern>/response</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LuckyNumber1Servlet</servlet-name>
<url-pattern>/luckynumber</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LuckyNumber2Servlet</servlet-name>
<url-pattern>/lucky2</url-pattern>
</servlet-mapping>
<error-page>
<exception-type>LuckyException</exception-type>
<location>/errorpage.html</location>
</error-page>
</web-app>
*********************errorpage.html file under /appication-context/web/
*******************************
<html>
<head>
<title>Data Entry Error</title>
</head>
<body bgcolor="white">
<h2>Please enter a number between 1 and 10. </h2>
</body>
</html>
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