My Applet crashes java.exe to crash

Question

Ok, I'm not sure why, but on some computers my applet is making java.exe crash. When i attach a debugger to java.exe when it crashes I see a "Access Violation Error". The oddest part is that while one computer will crash and another identical computer with the exact same setup wont. The crash happens the moment the applet starts.
Now I've done just about everything i could to figure this out. I've installed uninstalled and reinstalled java. I've run ram, hard drive, cpu, ect tests all reporting no problem. I've disabled anti-virus and did the uninstall and reinstall again. I've installed older versions of the java. I've resigned my jar file, created a new key and then resigned. Practically the only thing i have not done and is not a viable solution is reformat/replace the computers. So I'm left thinking it might be something in the applet that is causing it.
It could be in the applet parameters but i doubt it.
Pram fp is about 5,000 characters long
Pram VerfyType is about 1 character long
Pram Arg1 is a max of 11 characters long
Pram Arg2 is a max of 11 characters long
This applet is meant to interact with a program on the computer that connects to a variety of fingerprint scanners that we use and passes information form the internal site to the scanner and vice versa. So it just starts a loop back socket. For the loop back socket, i have tired 127.0.0.1 and localhost which still yield the same result.
Here is the applet. It's very simple.
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.Image;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;
import java.security.AccessController;
import java.security.PrivilegedAction;
public class Verify extends JApplet {
     private static final long serialVersionUID = 908206045464466336L;
     public JLabel jLabel1;
    public jPanel jPanel1;
    public String Template = "";
    public String VerfyType = "";
    public String Arg1 = "";
    public String Arg2 = "";
    public Thread t;
    Socket socket = null;
    public void stop()
         jPanel1.threadRun = false;
         if (socket != null)
              try {
                    socket.close();
               } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
     public void init()
        //Execute a job on the event-dispatching thread:
        try {
            javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                     Template = getParameter("fp").trim();
                     VerfyType = getParameter("VerfyType").trim();
                     Arg1 = getParameter("Arg1").trim();
                     Arg2 = getParameter("Arg2").trim();
                     initComponents();
        } catch (Exception e) {
            System.err.println("getParameter didn't successfully complete");
        StartVerify();
    private void initComponents() {
          jPanel1 = new jPanel();
          jLabel1 = new JLabel();
          jPanel1.setPreferredSize(new java.awt.Dimension(66, 66));
          jPanel1.setBackground(new java.awt.Color(255, 255, 255));
          jLabel1.setText("Initializing Please Wait.");
        setBackground(new java.awt.Color(255, 255, 255));
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 66, Short.MAX_VALUE)
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 66, Short.MAX_VALUE)
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 536, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(224, 224, 224)
                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jLabel1)
                .addContainerGap(116, Short.MAX_VALUE))
    public void StartVerify()
         t = new Thread() {
          public void run()
              AccessController.doPrivileged(new PrivilegedAction() {
              public Object run()
                        PrintWriter out = null;
                        BufferedReader in = null;
                        try {
                            socket = new Socket("localhost", 4001);
                            out = new PrintWriter(socket.getOutputStream(), true);
                            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                        } catch (UnknownHostException e) {
                             jLabel1.setText("Unkown Host Error.");
                            return null;
                        } catch (IOException e) {
                             jLabel1.setText("Unable to get communication streams..");
                            return null;
                        String reponse = "";
                        try {
                            reponse = in.readLine();
                            if (reponse.equalsIgnoreCase("cmd"))
                                out.write("v\n");
                                out.flush();
                                reponse = in.readLine();
                                if (reponse.equalsIgnoreCase("send"))
                                    out.write(Template+"\n");
                                    out.flush();
                                    reponse = in.readLine();
                                    if (reponse.equalsIgnoreCase("finger"))
                                         jLabel1.setText("Please Have the client place their finger on the scanner.");
                                         while (true)
                                              reponse = in.readLine();
                                              if (!reponse.equalsIgnoreCase("pulse"))
                                                   break;
                                        if (reponse.equalsIgnoreCase("good"))
                                            try {
                                                 DoRedirect();
                                                socket.close();
                                            } catch (IOException ex) {
                                        else if (reponse.equalsIgnoreCase("bad"))
                                                       int _return = LoopTellCanceled(socket, out, in);
                                        else
                                             jLabel1.setText("Unexpected response from finger print server.");
                                    else
                                         jLabel1.setText("Unexpected response from finger print server.");
                                else
                                     jLabel1.setText("Unexpected response from finger print server.");
                            else
                                 jLabel1.setText("Unexpected response from finger print server.");
                        catch (IOException ex)
                             jLabel1.setText("We lost connection to the finger print reader.");
                             System.err.println(ex);
                        try {
                            out.close();
                            in.close();
                            socket.close();
                        } catch (IOException e) {
                            System.err.println("Couldn't get I/O for the connection");
                            return null;
                        return null;
        t.start();
    private int LoopTellCanceled(Socket socket, PrintWriter out, BufferedReader in)
         int res = JOptionPane.showConfirmDialog(null, "Incorrect Finger Print. Would you like to try again?", "Finger Print was Bad", JOptionPane.YES_NO_OPTION);
         while (res == JOptionPane.YES_OPTION)
            String reponse = "";
            try {
                out.write("v\n");
                out.flush();
                reponse = in.readLine();
                if (reponse.equalsIgnoreCase("send"))
                    out.write(Template+"\n");
                    out.flush();
                    reponse = in.readLine();
                    if (reponse.equalsIgnoreCase("finger"))
                         jLabel1.setText("Please Have the client place their finger on the scanner.");
                         while (true)
                              reponse = in.readLine();
                              if (!reponse.equalsIgnoreCase("pulse"))
                                   break;
                        if (reponse.equalsIgnoreCase("good"))
                            try {
                                 DoRedirect();
                                socket.close();
                            } catch (IOException ex) {
                        else
                             res = JOptionPane.showConfirmDialog(null, "Incorrect Finger Print. Would you like to try again?", "Finger Print was Bad", JOptionPane.YES_NO_OPTION);
            } catch (IOException ex) {
                 System.err.println(ex);
         return res;
    public void DoRedirect()
          try
               if (Arg1.equalsIgnoreCase(""))
                    getAppletContext().showDocument(new URL("javascript: fprintVerified("+VerfyType+");"));
               else
                    if (Arg2.equalsIgnoreCase(""))
                         getAppletContext().showDocument(new URL("javascript: fprintVerified("+VerfyType+", "+Arg1+");"));
                    else
                         getAppletContext().showDocument(new URL("javascript: fprintVerified("+VerfyType+", "+Arg1+", "+Arg2+");"));
          catch (MalformedURLException ex)
               ex.printStackTrace();
}Edited by: Pyromanci on Mar 1, 2011 7:58 AM

Answer 1

What does your error console report? - Which one? Browser, PC, ect
How about your java console say? - I have no clue what it could be saying since java.exe crashes the moment the applet starts the console is no longer accessible.
What browser and version? - Firefox v3.6.13
Have you tried a different one? - Yes Ie 6,7, and 8. Though the site the applet runs form was designed specifically for firefox (internal site)
Have you tried Appletviewer? - Yes applet runs as intended.
Did you give the Applet permission? I know you said you signed it - did it all go right? - Yes. Gave me the usual response of will expire in x months