Re: Error opening file.

Knute Johnson <>
Wed, 14 Nov 2007 21:01:56 -0800
bcr666 wrote:

I am getting the following stack trace: Read error
    at Method)

This is the code from the class
import java.util.*;

import javax.swing.event.*;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

public class Loader extends Thread {
  transient Vector changeListeners = null;
  InputStream inputStream = null;
  HexWriter parent = null;
  Vector data = new Vector();

  public Loader(InputStream inputStream, HexWriter parent) {
    this.inputStream = inputStream;
    this.parent = parent;

  public byte[] getData() {
    if (data.size() == 0) {
      return null;
    return (byte[])data.get(0);

  public void run() {
    byte[] input = new byte[16];
    int status = 0;

    do {
        try {
            status =;
        } catch (IOException ex) {
          JOptionPane.showMessageDialog(parent, "Error reading
          fireStateChanged(new ChangeEvent(this));
        } finally {
          try { inputStream.close(); } catch (IOException ex) {}
        if (status > 0) {
          fireStateChanged(new ChangeEvent(this));
    } while (status > -1);

    try {
      fireStateChanged(new ChangeEvent(this));
    } catch (Exception ex) {}

  public synchronized void addChangeListener(ChangeListener listener)
    if (changeListeners == null) {
      changeListeners = new Vector();
    if (!changeListeners.contains(listener)) {

  public synchronized void removeChangeListener(ChangeListener
listener) {
    if (changeListeners == null) {
    if (changeListeners.contains(listener)) {
    if (changeListeners.size() == 0) {
      changeListeners = null;

  protected void fireStateChanged(final ChangeEvent e) {
    if (changeListeners != null) {
      final Vector listeners = changeListeners;
      int count = listeners.size();
      for (int i = 0; i < count; i++) {
        final int j = i;
        SwingUtilities.invokeLater(new Runnable() {
          public void run() {
            ( (ChangeListener)

The InputStream is passed in from another class and is guaranteed to
be open. I get the same error no matter what file I try to open. Am
I doing something wrong?

You are not guaranteed to read all 16 bytes, or any bytes for that
matter. Why would you open the stream in another class and read it in
this one? Why does getData() only return the first element? You could
possibly read more than one but never retrieve it.

This is really a mess and without the other pieces it is very difficult
to figure out what your problem is. The error message shows you the
line number of the error. What program line is that?

Why don't you either tell us what you are really trying to do or provide


Knute Johnson
email s/nospam/knute/

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