Java cgi applet not working
Hi guys,
I have an applet that allows a user to "create" a datafile using buttons, to ensure consistency of input. I then want to write this file tto my webserver (it keeps the data for a soccer league, with basic stats). I know that applets can't write in theory, so I have tried to do it using the POST function, to a basic CGI programme. I am getting an error
HTTP/1.1 502 Gateway Error
Server: Microsoft-IIS/5.0
Date: Tue, 15 Apr 2003 18:07:32 GMT
Connection: close
Content-Length: 186
Content-Type: text/html
<head><title>CGI Application Timeout</title></head><body><h1>CGI Timeout</h1>The specified CGI application exceeded the allowed time for processing. The server has deleted the process.Data file sent to host
I know this is a java forum, but the CGI is simple
print "content-type: text/plain\n\n";
open(OUT,"> /Under14/111111.TST");
while(<>){
print OUT $_;
print $_;
close(OUT);
exit 0;I have no idea how to debug this particular error, searching the internet brings out hundreds of similar errors, but little explanation of what is going wrong
The Java code that kicks this off is
//============================================================================//
public void SendData(String data) throws Exception {
tArea1.append("\n\n************ Sending Data ************\n");
URL url = new URL("http","www.lagfc.co.uk","/cgi-bin/ResUpd.cgi");
URLConnection ucon = url.openConnection();
ucon.setDoOutput(true);
ucon.setDoInput(true);
ucon.setUseCaches(false);
ucon.setRequestProperty("Content-type", "text/plain");
ucon.setRequestProperty("Content-length", 750+"");
PrintStream out = new PrintStream(ucon.getOutputStream());
out.print(data);
out.flush();
out.close();
DataInputStream in = new DataInputStream(ucon.getInputStream());
String s;
while((s=in.readLine()) !=null){
tArea1.append(s);
in.close();
tArea1.append("\n\nData file sent to host");
} // end of sendData
//============================================================================//Help..........................
Sscotties : I do appreciate your help, and maybe I have got wood for trees syndrome. I have been trying to understand what is going wrong here. I started learning Java 2 weeks ago, it seemed a good idea at the time, and a way to combine helping out my daughters football team, with a desire to understand more.
I do not have a programming background, and so some of what you have been trying to tell me, will have gone right over my head, and I won't know which bits! I didn't understand the implications of what you were asking me to do last night, but having thought it through with a cooler head, I thank you for the login code. It is a good way to stop unauthorised users screwing up my results file. (at least if they only have my level of knowledge!), and as such I will incorporate it into the finished product.
My frustration is down to the fact that I really have little understanding of what I am doing at this point, and I have no idea how to tackle the problem. Before I post onto this board, I normally do a Google trawl through many pages of data in an effort to try and find the answers myself, it helps with the general understanding of how things work, and is very satisfying when I can fix the problems. I know for example, that java is not the platform independant language I thought it was two weeks ago. Most of my users use basic IE, and so when I test something out, I have to test it using plain IE, then IE with 1.4.1
then Netscape. This slows things down tremendously, as things like TextArea attributes work differently between MS and 1.4.1. I can work on a simple problem for hours, to find that its just MS doing there own thing. A great tip I got the other day was to compile using -target 1.1. This has increased my speed of development ten fold (now at 8mph!)
My apologies for being tetchy, its nothing a few beers and a spell away from the PC won't cure.
Back to the problem in hand. I made all the changes you suggested. The changes to perl make no difference, the error message is the same. I have left your suggestions to use getCodeBase().getHost() in, as they make the applet more portable, and I thank you for that.
The DataInputStream is deprecated, but as I am using -target 1.1 will this be a problem (Could be Newbie stupid question time! :-{)) I have used this format in other parts of the code as well. I am also using action rather than ActionEvent to listen for events in the prog. This is the only other deprecated method in the coding.
I don't know how to set permissions on the server, but will ask the question of my hosting company. I have a pick up and run cgi script that does the guest book, and this worked no problem, writing records to a guestdata file, and a password file, with no further changes needed to the file permissions, but still worth checking.
I am sending the data, because the data is returned to me, before the error message, although not all the data sent has been returned as part of the error message, are there any restrictions on the size of a String, the file is 9250 bytes long, does it need terminating with an EOF marker of some sort ?
Any advice will be gratefully accepted
regards
KPJ
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P2.setMinimumSize(new Dimension(200,80));
P2.setPreferredSize(new Dimension(200,80));
P2.setMaximumSize(new Dimension(200,80));
P2.setLayout(new BoxLayout(P2,BoxLayout.Y_AXIS));
scrollPane2.setAlignmentX (Component.LEFT_ALIGNMENT);
P2.add(scrollPane2);
paste.setAlignmentX(Component.LEFT_ALIGNMENT);
P2.add(paste);
Container c=getContentPane();
c.add(P2);
//COPIES TEXT FROM FILE ON MY DISK TO THE TEXTAREA
private class copyhandler implements ActionListener
{ public void actionPerformed(ActionEvent event)
{ JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog(testing4.this);
// user clicked Cancel button on dialog
if ( result == JFileChooser.CANCEL_OPTION )
return;
fileName = fileChooser.getSelectedFile();
if ( fileName == null ||
fileName.getName().equals( "" ) )
JOptionPane.showMessageDialog( null,"Invalid File Name",
"Invalid File Name",
JOptionPane.ERROR_MESSAGE );
else
{ try
{ FileReader in = new FileReader(fileName);
BufferedReader reading= new BufferedReader(in);
String store="";
while (reading.ready())
{ StringTokenizer st = new StringTokenizer(reading.readLine());
store=store+st.nextToken()+"\n";
display.setText(store);
catch ( IOException e )
{ JOptionPane.showMessageDialog( null,
"Error Opening File", "Error",
JOptionPane.ERROR_MESSAGE );
public static void main (String [] args)
{ testing4 done =new testing4();
JFrame frame = new JFrame("testing");
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
done.init();
frame.getContentPane().add(done);
frame.pack();
frame.setSize(205,110);
frame.setVisible(true);
}It Still giving a blank page.
New Code
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
//import java.lang.Object;
public class testing4 extends JApplet
{ private JTextArea display;
private JScrollPane scrollPane2;
private JButton paste;
private JPanel P2;
private File fileName;
public void init()
paste=new JButton("paste");
paste.setMinimumSize(new Dimension(90,20));
paste.setPreferredSize(new Dimension(90,20));
paste.setMaximumSize(new Dimension(90,20));
copyhandler pa=new copyhandler();
paste.addActionListener(pa);
display=new JTextArea();
scrollPane2=new JScrollPane(display);
scrollPane2.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane2.setMinimumSize(new Dimension(200,58));
scrollPane2.setPreferredSize(new Dimension(200,58));
scrollPane2.setMaximumSize(new Dimension(200,58));
P2=new JPanel();
P2.setMinimumSize(new Dimension(200,80));
P2.setPreferredSize(new Dimension(200,80));
P2.setMaximumSize(new Dimension(200,80));
P2.setLayout(new BoxLayout(P2,BoxLayout.Y_AXIS));
scrollPane2.setAlignmentX (Component.LEFT_ALIGNMENT);
P2.add(scrollPane2);
paste.setAlignmentX(Component.LEFT_ALIGNMENT);
P2.add(paste);
Container c=getContentPane();
c.add(P2);
//COPIES TEXT FROM FILE ON MY DISK TO THE TEXTAREA
private class copyhandler implements ActionListener
{ public void actionPerformed(ActionEvent event)
{ JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog(testing4.this);
// user clicked Cancel button on dialog
if ( result == JFileChooser.CANCEL_OPTION )
return;
fileName = fileChooser.getSelectedFile();
if ( fileName == null ||
fileName.getName().equals( "" ) )
JOptionPane.showMessageDialog( null,"Invalid File Name",
"Invalid File Name",
JOptionPane.ERROR_MESSAGE );
else
{ try
{ FileReader in = new FileReader(fileName);
BufferedReader reading= new BufferedReader(in);
String store="";
while (reading.ready())
{ StringTokenizer st = new StringTokenizer(reading.readLine());
store=store+st.nextToken()+"\n";
display.setText(store);
catch ( IOException e )
{ JOptionPane.showMessageDialog( null,
"Error Opening File", "Error",
JOptionPane.ERROR_MESSAGE );
public static void main (String [] args)
{ testing4 done =new testing4();
//you did not set applet's width and height:
//applet is a container too
done.setWidth(205);
done.setHeight(110);
JFrame frame = new JFrame("testing");
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
{ System.exit(0);
done.init();
frame.getContentPane().add(done);
frame.pack();
frame.setSize(205,110);
frame.setVisible(true);
} -
Java plugin is not working properly
I have FF 16.0.1 and Java plugin 7 u 9, this is not the java with security problems...
http://web.psjaisd.us/auston.cron/ABCronPortal/GeoGebraMenu/Investigating%20Parent%20FunctionsUsing%20GeoGebraGeoGebra%20is%20graphing.htm
loads very slowly or not at all, including the majority of the links on the page...this is a menu to multiple Java applets in GeoGebra. This page has a preload link which causes a problem. All links are java applets which until your security issues on Java were implements worked flawlessly and better than any other browser service...
You are forcing me to us IE, which I despise!
I cannot copy from crashing page...So, you are having problems with Java 7 update 9 in Firefox? You said "until your security issues on Java were implements worked flawlessly and better than any other browser service..." I don't know what you mean. Java security updates are from java.com (Oracle) not Mozilla.
In case it helps, I downgraded from Java 7 to Java 6 awhile back for security reasons and I'm now running [http://java.com/en/download/manual_v6.jsp Java 6 Update 37], which is the latest Java 6 and has all current security patches. (I'll eventually switch back to Java 7 once Java 6 is no longer supported). Except for a few of the links loading slowly, I don't see any issues on the page you mentioned. Hopefully someone with Java 7 u9 will be along and test the links but you could try uninstalling Java 7 and installing Java 6. More on Java here:
*http://kb.mozillazine.org/Java
*[[Use the Java plugin to view interactive content on websites]]
You also said, "I cannot copy from crashing page". Is Firefox crashing? Do you have any recent crash reports?
#Enter about:crashes in the Firefox location bar (that's where you enter your website names) and press Enter. You should now see a list of submitted crash reports.
#Copy the most recent 5 report IDs that you see in the crash report window and paste them into your forum response.
More information and further troubleshooting steps can be found in the [[Firefox crashes]] article.
Also, Firefox 16.0 is not the current version and is insecure. See http://www.mozilla.org/security/known-vulnerabilities/firefox.html
Unless you have reasons for using an older version despite the vulnerabilities, you should [[update Firefox to the latest version]], currently 17.0.1.
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