From JavasSript called signed (FileDialog) Applet Problems...

Question

Hallo,
I want to read a by JavaScript opened selected file with the FileDialog in a Byte[], and give this Byte[] back to JavaScript. I have this code for my unsigned applet working fine without reading the selected file in a byte[], but give the filepath and name back to JavaScript:
import java.applet.Applet;
import java.awt.FileDialog;
import java.awt.Frame;
import netscape.javascript.JSObject;
public class OpenFileDialogJava6 extends Applet
     private static final long serialVersionUID = -1401553529888391702L;
     private Frame m_parent;
    private FileDialog m_fileDialog;
*Displays a file dialog, calling standard JavaScript methods when the*
user selects a file or cancels the dialog.
*    public void newFileDialog(String onFileJS, String onCancelJS)*
*          System.out.println("open Dialog...");*
*         openDialog(onFileJS, onCancelJS);*
*Displays a file dialog, calling the specified JavaScript functions when*
the user selects a file or cancels the dialog.
@param onFile The name of the function to call when the user selects a
*file.*
@param onCancel The name of the function to call when the user cancels
*a dialog selection.*
    public void openDialog(final String onFile, final String onCancel)
         System.out.println("Calling open dialog...");
         if (m_parent == null)
             m_parent = new Frame();
        if (m_fileDialog == null)
             m_fileDialog = new FileDialog(m_parent, "Medien hinzufügen", FileDialog.LOAD);             
        m_fileDialog.setVisible(true);       
        m_fileDialog.toFront();
        final String directory = m_fileDialog.getDirectory();  
        final String returnFile = m_fileDialog.getFile();
         m_fileDialog.setVisible(false);     
        m_parent.setVisible(false);
        if (returnFile == null)
             System.out.println("onCancel");
             callJavaScript(onCancel);     
        else
             System.out.println("onFile");
             System.out.println(directory+returnFile);
             callJavaScript(onFile, directory+returnFile);
     private void callJavaScript(final String func, final Object... args)
          final JSObject window = JSObject.getWindow(OpenFileDialogJava6.this);
          if (window == null)
              System.out.println("Could not get window from JSObject!!!");
              return;
          System.out.println("Calling func through window");
          try
               window.call(func, args);
          catch (final Exception e)
              System.out.println("Got error!!"+e.getMessage());
              e.printStackTrace();
              showError(e);
          System.out.println("Finished JavaScript call...");
     private void showError(final Exception e)
          final String[] args = new String[]{e.getMessage()};
          final JSObject window = JSObject.getWindow(this);
          try
               window.call("alert", args);
          catch (final Exception ex)
               System.out.println("Error showing error! "+ex);
}I self-sign the Jar and write that byte[] test = (byte[]) java.security.AccessController.doPrivileged(
          new java.security.PrivilegedAction() to the code in where I want to read the file.....
So now I started to change the code in the public void openDialog(final String onFile, final String onCancel) to get the Byte[] of the selected File
        final String directory = m_fileDialog.getDirectory();  
        final String returnFile = m_fileDialog.getFile();
        final File file = new File(directory+
                File.separator +returnFile);
        byte[] test = (byte[]) java.security.AccessController.doPrivileged(
          new java.security.PrivilegedAction()
               public Object run()
                  try
                      FileInputStream fileInputStream = new FileInputStream(file);
                      byte[] data = new byte[(int) file.length()];
                      try
                           fileInputStream.read(data);
                           fileInputStream.close();
                           return data;
                      catch(IOException iox)
                            System.out.println("File read error...");
                            iox.printStackTrace();
                            return null;
                 catch (FileNotFoundException fnf)
                       System.out.println("File not found...");
                       fnf.printStackTrace();
                       return null;
         m_fileDialog.setVisible(false);     
        m_parent.setVisible(false);
.......Without signing the jar: I get this in IE 8:
Meldung: java.security.AccessControlException: access denied ("java.io.FilePermission" "C:\xampp\htdocs\index.php" "read")
Zeile: 6
Zeichen: 1
Code: 0
URI: file:///E:/FH%20Kempten/Semester%206/Java/Java%20Projekte/OpenFileDialogJava6/bin/Neues%20Textdokument.html
Ok this I understand, but when I sign it, I open my FileDialog, select a file, ok -> nothing happens: Firfox and IE show me:
uncaught exception: java.lang.reflect.InvocationTargetException*
And in Java Console nothing: Just my Output:
open Dialog...
Calling open dialog...

Answer 1

Hallo,
I want to read a by JavaScript opened selected file with the FileDialog in a Byte[], and give this Byte[] back to JavaScript. I have this code for my unsigned applet working fine without reading the selected file in a byte[], but give the filepath and name back to JavaScript:
import java.applet.Applet;
import java.awt.FileDialog;
import java.awt.Frame;
import netscape.javascript.JSObject;
public class OpenFileDialogJava6 extends Applet
     private static final long serialVersionUID = -1401553529888391702L;
     private Frame m_parent;
    private FileDialog m_fileDialog;
*Displays a file dialog, calling standard JavaScript methods when the*
user selects a file or cancels the dialog.
*    public void newFileDialog(String onFileJS, String onCancelJS)*
*          System.out.println("open Dialog...");*
*         openDialog(onFileJS, onCancelJS);*
*Displays a file dialog, calling the specified JavaScript functions when*
the user selects a file or cancels the dialog.
@param onFile The name of the function to call when the user selects a
*file.*
@param onCancel The name of the function to call when the user cancels
*a dialog selection.*
    public void openDialog(final String onFile, final String onCancel)
         System.out.println("Calling open dialog...");
         if (m_parent == null)
             m_parent = new Frame();
        if (m_fileDialog == null)
             m_fileDialog = new FileDialog(m_parent, "Medien hinzufügen", FileDialog.LOAD);             
        m_fileDialog.setVisible(true);       
        m_fileDialog.toFront();
        final String directory = m_fileDialog.getDirectory();  
        final String returnFile = m_fileDialog.getFile();
         m_fileDialog.setVisible(false);     
        m_parent.setVisible(false);
        if (returnFile == null)
             System.out.println("onCancel");
             callJavaScript(onCancel);     
        else
             System.out.println("onFile");
             System.out.println(directory+returnFile);
             callJavaScript(onFile, directory+returnFile);
     private void callJavaScript(final String func, final Object... args)
          final JSObject window = JSObject.getWindow(OpenFileDialogJava6.this);
          if (window == null)
              System.out.println("Could not get window from JSObject!!!");
              return;
          System.out.println("Calling func through window");
          try
               window.call(func, args);
          catch (final Exception e)
              System.out.println("Got error!!"+e.getMessage());
              e.printStackTrace();
              showError(e);
          System.out.println("Finished JavaScript call...");
     private void showError(final Exception e)
          final String[] args = new String[]{e.getMessage()};
          final JSObject window = JSObject.getWindow(this);
          try
               window.call("alert", args);
          catch (final Exception ex)
               System.out.println("Error showing error! "+ex);
}I self-sign the Jar and write that byte[] test = (byte[]) java.security.AccessController.doPrivileged(
          new java.security.PrivilegedAction() to the code in where I want to read the file.....
So now I started to change the code in the public void openDialog(final String onFile, final String onCancel) to get the Byte[] of the selected File
        final String directory = m_fileDialog.getDirectory();  
        final String returnFile = m_fileDialog.getFile();
        final File file = new File(directory+
                File.separator +returnFile);
        byte[] test = (byte[]) java.security.AccessController.doPrivileged(
          new java.security.PrivilegedAction()
               public Object run()
                  try
                      FileInputStream fileInputStream = new FileInputStream(file);
                      byte[] data = new byte[(int) file.length()];
                      try
                           fileInputStream.read(data);
                           fileInputStream.close();
                           return data;
                      catch(IOException iox)
                            System.out.println("File read error...");
                            iox.printStackTrace();
                            return null;
                 catch (FileNotFoundException fnf)
                       System.out.println("File not found...");
                       fnf.printStackTrace();
                       return null;
         m_fileDialog.setVisible(false);     
        m_parent.setVisible(false);
.......Without signing the jar: I get this in IE 8:
Meldung: java.security.AccessControlException: access denied ("java.io.FilePermission" "C:\xampp\htdocs\index.php" "read")
Zeile: 6
Zeichen: 1
Code: 0
URI: file:///E:/FH%20Kempten/Semester%206/Java/Java%20Projekte/OpenFileDialogJava6/bin/Neues%20Textdokument.html
Ok this I understand, but when I sign it, I open my FileDialog, select a file, ok -> nothing happens: Firfox and IE show me:
uncaught exception: java.lang.reflect.InvocationTargetException*
And in Java Console nothing: Just my Output:
open Dialog...
Calling open dialog...