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Unreported exception-- Please help :-)

1 reply on 1 page. Most recent reply: Jan 14, 2003 11:25 PM by Sarma K T R B

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Sabrina

Posts: 1
Nickname: sabrina
Registered: Jan, 2003

Unreported exception-- Please help :-)

Posted: Jan 13, 2003 5:46 PM

I have an unreported exception coming up when I try to compile my servlet. I can't figure out why. Can anyone help me?
The exception says
"unreported exception java.langClassNotFoundException; must be caught or declared to be thrown
votes = (int [] indat.readObject();"

Here's my code:

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Survey extends HttpServlet {

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {
int votes[] = null;
int index;
int vote;
File survdat = new File("survdat.dat");
String gender;
String products[] = {"Conventional TX", "HDTV", "VCR",
"CD Player/recorder", "DIVD player", "Other"};

// Set the content type for the response output and get a writer

response.setContentType( "text/html" );
PrintWriter servletOut = response.getWriter();

// Produce the head of the output document

servletOut.print("<html><head>");
servletOut.println(
"<title> Return message </title></head><body>");

// If the file already exists, read in its data

if (survdat.exists()) {
ObjectInputStream indat = new ObjectInputStream(new FileInputStream(survdat));
votes = (int []) indat.readObject();
indat.close();
}

// If file does not exist (this is the first vote), create votes array

else
votes = new int[14];

// Get the gender of the survey respondee

gender = request.getParameter("gender");

// Add the consume electronics vote of the response to the votes array

vote = Integer.parseInt(request.getParameter("vote"));
if (gender.equals("male")) vote += 7;
votes[vote]++;

// Write updates votes array to disk

ObjectOutputStream outdat = new ObjectOutputStream(
new FileOutputStream(survdat));
outdat.writeObject(votes);
outdat.flush();
outdat.close();

// Create the initial response information

servletOut.println("<h3>Thank You...</h3>");
servletOut.println("<h4>Current Survey Results:</h4>");

// Create the ttal votes return information for female respondents

servletOut.println("<h5>For Female Respondents </h5>");
for (index = 0; index < 7; index++) {
servletOut.print(products[index]);
servletOut.print(": ");
servletOut.println(votes[index]);
servletOut.println("<br />");
}

// Create the total votes return information for male respondents

servletOut.println("<h5>For Male Respondents </h5>");
for (index = 0; index < 7; index++) {
servletOut.print(products[index - 7])

Sarma K T R B

Posts: 5
Nickname: sarma2312
Registered: Jan, 2003

Re: Unreported exception-- Please help :-)

Posted: Jan 14, 2003 11:25 PM

just modify your code as below:

try{
if (survdat.exists()) {
ObjectInputStream indat = new ObjectInputStream(new FileInputStream(survdat));
votes = (int []) indat.readObject();
indat.close();
}
// If file does not exist (this is the first vote), create votes array

else
votes = new int[14];
}catch(Exception ex){// code comes here if an exception is raised}

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