Sandbox Security Issue (MIDI Not Working In Applet)

Hi all,
I'm having problems getting javax.sound.midi to work in a java applet. It works fine when I run the applet from within JGrasp, but when I try to run the applet from an HTML file there is no sound. From what info I've found, it seems like my problem has to do with the sandbox security so the applet is not being able to access the computer's sound card, but I still haven't found a solution or a work around to that problem (after about 2 weeks worth of searching). The world of applet security is all new territory for me.
I am running the html file off of my hard drive and I have my test program's class file in the same directory. I have tried both firefox and internet explorer web browsers (and also did the "allow blocked content" in internet explorer).
I have no other sound sources playing or paused that would interfere with the web browser playing (it works in JGrasp and immediately after closing JGrasp completely it doesn't work in the web browser).
Any help help in getting this figured out would be greatly appreciated. An example of an open source MIDI Java applet that I can pick apart to figure out what I need to make this work would be fantastic. Thanks in advance!
Here are the codes to my test program and HTML file:
PlayMIDI.html
<html>
<body>
<CENTER><applet code="PlayMIDI.class" width="1000" height="500"></applet></CENTER>
</body>
</html>PlayMIDI.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.net.*;
import javax.sound.midi.*;
public class PlayMIDI extends JApplet
    public void init()
        MIDITest play = new MIDITest(0);
        play.playSong(100);
class MIDITest
    private final int C4 = 60;                                        // C4 is the note middle C
    private final int MF = Integer.MAX_VALUE / 2;        // MF stands for mezzo forte -- medium loud
    private int iTimbre;                                                 // midi instrument number
    private Synthesizer synth;                                        // get the java synthesizer
    private MidiChannel [] channels;                              // get an array of channels. This is the number of notes that can sound simultaneously
    // Creates a midi synthisizer using the supplied instrument "patch".
    //   instrument numbers can vary from 0 to 127
    public MIDITest(int instrumentNumber)
        iTimbre = instrumentNumber;
        try
        {   synth = MidiSystem.getSynthesizer();                                   //synth = MidiSystem.getSynthesizer();
            synth.open();                                                                           // open the synthesizer
            synth.loadAllInstruments(synth.getDefaultSoundbank());     // make all instruments available
            channels = synth.getChannels();
            channels[0].programChange(0, iTimbre);                                   // set the instrument for the channel 0
        catch (Exception e)
        { System.out.println(e);
    public void playSong(int tempo)
        int quarter     = 60000;
        int eigth     = 30000;
        int half          = 120000;
        int whole     = 240000;
        int D4 = C4 + 2;
        int E4 = C4 + 4;
        int G4 = C4 + 7;
        int A4 = C4 + 9;
        int B4 = C4 + 11;
        try
        {   channels[0].noteOn(E4, MF);                         // start the instrument on channel 0 sounding
            channels[0].noteOn(B4, MF);
            channels[0].noteOn(G4, MF);
            channels[0].noteOn(D4, MF);
            Thread.sleep(whole / tempo);                         // sleep causes the program to wait the given number of milliseconds
            channels[0].noteOff(E4, MF);                         // stop the sound on the instrument on channel 0
            channels[0].noteOff(B4, MF);
            channels[0].noteOff(G4, MF);
            channels[0].noteOff(D4, MF);
        catch (Exception e)
        {   System.out.println(e);
}

Hi ejp, thanks for the reply.
I did some searching for applet signing and I found this:
http://www.brendonwilson.com/projects/signed-java/
"+Developers should be warned that signing alone is not enough to enable their Java applets to access resources normally restricted by the Java sandbox. Although signing provides proof of the integrity of the applet and validation of the authors identity through trust-heirarchies, developers must also make use of the browser-dependent APIs to request permission from the user to perform restricted activities.+"
So am I going to have to do ask permission from each browser in order to get access to the sound card for the MIDI to play or will the MIDI work without that?
Also, I found this tutorial on signing applets. Does this look like a good one?
http://www-personal.umich.edu/~lsiden/tutorials/signed-applet/signed-applet.html
Thanks again,
-tkr

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I guess it is either not calling the private function that is checking the username and password from the tes=xt file or it can not access the file. Please help as soon as possible as this is related to my college project.
I am attaching the code herewith. Suggestions to improve the coding are also welcome.
the second problem is that while writing my second program for generating a form which registers a user the html is not at all loading the applet into the browser and also if im trying to access a file to write all the details into the console is showing numerous amount of error after i press the button which i can't not understand. the only thing i can understand is that it is related to file access permissions. If anybody could put some light on the working of worker threads and thread safe activities of SwingUtilities.invokeandWait method it would be really appreciable.
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
<applet code = "UserLogin" width = 300 height = 150>
</applet>
public class UserLogin extends JApplet implements ActionListener, KeyListener {
     private JLabel lTitle;
     private JLabel lUsername, lPassword;
     private JTextField tUsername;
     private JPasswordField tPassword;
     private JButton bLogin;
     private JLabel lLinkRegister, lLinkForgot;
     private JLabel lEmpty = new JLabel(" ", JLabel.CENTER);
     private JPanel panel1, panel2;
     public void init() {
          try {
               UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
               SwingUtilities.invokeAndWait(new Runnable() {
                    public void run() {
                         LoginGUI();
          catch(Exception e) {
               e.printStackTrace();
     public void start() {
          setVisible(true);
     public void stop() {
          setVisible(false);
     private void LoginGUI() {
          super.setSize(300, 150);
          super.setBackground(Color.white);
          lTitle = new JLabel("<HTML><BODY><FONT FACE = \"COURIER NEW\" SIZE = 6 COLOR = BLUE>Login</FONT></BODY></HTML>", JLabel.CENTER);
          lUsername = new JLabel("Username : ", JLabel.CENTER);
          lPassword = new JLabel("Password : ", JLabel.CENTER);
          tUsername = new JTextField(15);
          tPassword = new JPasswordField(15);
          bLogin = new JButton("LOGIN");
//          bLogin.setEnabled(false);
          bLogin.addActionListener(this);
          bLogin.addKeyListener(this);
          panel2 = new JPanel();
          GridBagLayout gbag = new GridBagLayout();
          GridBagConstraints gbc = new GridBagConstraints();
          panel2.setLayout(gbag);
          panel2.addKeyListener(this);
          gbc.anchor = GridBagConstraints.CENTER;
          panel2.setMinimumSize(new Dimension(300, 200));
          panel2.setMaximumSize(panel2.getMinimumSize());
          panel2.setPreferredSize(panel2.getMinimumSize());
          gbc.gridx = 1;
          gbc.gridy = 1;
          gbag.setConstraints(lUsername,gbc);
          panel2.add(lUsername);
          gbc.gridx = 2;
          gbc.gridy = 1;
          gbag.setConstraints(tUsername,gbc);
          panel2.add(tUsername);
          gbc.gridx = 1;
          gbc.gridy = 2;
          gbag.setConstraints(lPassword,gbc);
          panel2.add(lPassword);
          gbc.gridx = 2;
          gbc.gridy = 2;
          gbag.setConstraints(tPassword,gbc);
          panel2.add(tPassword);
          gbc.gridx = 2;
          gbc.gridy = 3;
          gbag.setConstraints(lEmpty,gbc);
          panel2.add(lEmpty);
          gbc.gridx = 2;
          gbc.gridy = 4;
          gbag.setConstraints(bLogin,gbc);
          panel2.add(bLogin);
          panel1 = new JPanel(new BorderLayout());
          panel1.add(lTitle, BorderLayout.NORTH);
          panel1.add(panel2, BorderLayout.CENTER);
          add(panel1);
          setVisible(true);
     public void keyReleased(KeyEvent ke) {}
     public void keyTyped(KeyEvent ke) {}
     public void keyPressed(KeyEvent ke) {
          if(ke.getKeyCode() == KeyEvent.VK_ENTER){
               String username = tUsername.getText();
               String password = new String(tPassword.getPassword());
               if(username.length() == 0 || password.length() == 0) {
                    JOptionPane.showMessageDialog(new JFrame(),"You must enter a username and password to login", "Error", JOptionPane.ERROR_MESSAGE);
               else {
                    boolean flag = checkUsernamePassword(username, password);
                    if(flag)
                         JOptionPane.showMessageDialog(new JFrame(),"Username and Password Accepted", "Access Granted", JOptionPane.INFORMATION_MESSAGE);
                    else
                         JOptionPane.showMessageDialog(new JFrame(),"Username or password Incorrect", "Access Denied", JOptionPane.INFORMATION_MESSAGE);
     public void actionPerformed(ActionEvent ae) {
          String gotCommand = ae.getActionCommand();
          if(gotCommand.equals("LOGIN")) {
               String username = tUsername.getText();
               String password = new String(tPassword.getPassword());
               if(username.length() == 0 || password.length() == 0) {
                    JOptionPane.showMessageDialog(new JFrame(),"You must enter a username and password to login", "Error", JOptionPane.ERROR_MESSAGE);
               else {
                    boolean flag = checkUsernamePassword(username, password);
                    if(flag)
                         JOptionPane.showMessageDialog(new JFrame(),"Username and Password Accepted", "Access Granted", JOptionPane.INFORMATION_MESSAGE);
                    else
                         JOptionPane.showMessageDialog(new JFrame(),"Username or password Incorrect", "Access Denied", JOptionPane.INFORMATION_MESSAGE);
     private boolean checkUsernamePassword(String username, String password) {
          String user = null, pswd = null;
          try {
               FileInputStream fin = new FileInputStream("@data\\userpass.txt");
               DataInputStream din = new DataInputStream(fin);
               BufferedReader brin = new BufferedReader(new InputStreamReader(din));
               user = (String) brin.readLine();
               pswd = (String) brin.readLine();
          catch(IOException ioe) {
               ioe.printStackTrace();
          if(username.equals(user) && password.equals(pswd))
               return true;
          else
               return false;
}PLEASE HELP ME GUYS......

RockAsh wrote:
Hey Andrew, first of all sorry for that shout, it was un-intentional as i am new to posting topics on forums and didn't new that this kind of writing is meant as shouting. Cool.
Secondly thank you for taking interest in my concern.No worries.
Thirdly, as i mentioned before, I am reading i file for checking of username and password. the file is named as "userpass.txt" and is saved in the directory named "@data" which is kept in the same directory in which my class file resides.OK - server-side. That makes some sense, and makes things easier. The problem with your current code is that the applet will be looking for that directory on the end user's local file system. Of course the file does not exist there, so the applet will fail unless the the end user is using the same machine as the server is coming from.
To get access to a resource on the server - the place the applet lives - requires an URL. In applets, URLs are relatively easy to form. It might be something along the lines of
URL urlToPswrd = new URL(getCodeBase(), "@data/userpass.txt");
InputStream is = urlToPswrd.openStream();
DataInputStream din = new DataInputStream(is);
So the problem is that it is reading the file and showing the specific output dialog box when i run it through appletviewer.. Huhh. What version of the SDK are you using? More recent applet viewers should report security exceptions if the File exists.
..but the same is not happening when i launch the applet in my browser window using the code as written belowHave you discovered how to open the Java Console in the browser yet? It is important.
Also the answer to your second question
Also, the entire approach to storing/restoring the password is potentially wrong. For instance, where is it supposed to be stored, on the server, or on the client?is that, as of now it is just my college project so all the data files and the username and password wiles will be stored on my laptop only i.e. on the client only. no server involved.OK, but understand that an applet ultimately does not make much sense unless deployed through a server. And the entire server/client distinction becomes very important, since that code would be searching for a non-existent file on the computer of the end user.

Sandbox Security Issue (MIDI Not Working In Applet)

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