Index: toolsrc/org/mozilla/javascript/tools/debugger/SwingGui.java
===================================================================
--- toolsrc/org/mozilla/javascript/tools/debugger/SwingGui.java.orig	2009-11-16 15:55:49.986561156 +0100
+++ toolsrc/org/mozilla/javascript/tools/debugger/SwingGui.java	2009-11-16 15:56:51.102061154 +0100
@@ -42,6 +42,7 @@
 package org.mozilla.javascript.tools.debugger;
 
 import javax.swing.*;
+import javax.swing.filechooser.*;
 import javax.swing.text.*;
 import javax.swing.event.*;
 import javax.swing.table.*;
@@ -333,7 +334,14 @@
         statusBar = new JLabel();
         statusBar.setText("Thread: ");
         contentPane.add(statusBar, BorderLayout.SOUTH);
-        dlg = new JFileChooser();
+        try {
+            dlg = new JFileChooser();
+        } catch (SecurityException e) {
+            // Work around bug in JFileChooser when security is enforced.
+            // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4802383
+            dlg = new JFileChooser(new FileWrapper("."),
+                                   new FileSystemViewWrapper());
+        }
 
         javax.swing.filechooser.FileFilter filter =
             new javax.swing.filechooser.FileFilter() {
@@ -3592,7 +3600,130 @@
 
           default:
             throw new IllegalArgumentException(String.valueOf(type));
+        }
+    }
+}
+
+/**
+ * A <code>FileSystemView</code> that ensures <code>File</code> objects
+ * returned from methods are instances of <code>FileWrapper</code>.
+ * This class is used to work around bugs in {@link JFileChooser}.
+ */
+class FileSystemViewWrapper extends FileSystemView {
 
+    private FileSystemView v = FileSystemView.getFileSystemView();
+
+    public File createFileObject(File dir, String filename) {
+        return new FileWrapper(v.createFileObject(dir, filename));
+    }
+
+    public File createFileObject(String path) {
+        return new FileWrapper(v.createFileObject(path));
+    }
+
+    public File createNewFolder(File containingDir) throws IOException {
+        return new FileWrapper(v.createNewFolder(containingDir));
+    }
+
+    public File getChild(File parent, String fileName) {
+        return new FileWrapper(v.getChild(parent, fileName));
+    }
+
+    public File getDefaultDirectory() {
+        return new FileWrapper(v.getDefaultDirectory());
+    }
+
+    public File[] getFiles(File dir, boolean useFileHiding) {
+        File[] fs = v.getFiles(dir, useFileHiding);
+        File[] ret = new File[fs.length];
+        for (int i = 0; i < fs.length; i++) {
+            ret[i] = new FileWrapper(fs[i]);
         }
+        return ret;
+    }
+
+    public File getHomeDirectory() {
+        return new FileWrapper(v.getHomeDirectory());
+    }
+
+    public File getParentDirectory(File dir) {
+        return new FileWrapper(v.getParentDirectory(dir));
+    }
+
+    public File[] getRoots() {
+        File[] fs = v.getRoots();
+        File[] ret = new File[fs.length];
+        for (int i = 0; i < fs.length; i++) {
+            ret[i] = new FileWrapper(fs[i]);
+        }
+        return ret;
+    }
+
+    public String getSystemDisplayName(File f) {
+        return v.getSystemDisplayName(f);
+    }
+
+    public Icon getSystemIcon(File f) {
+        return getSystemIcon(f);
+    }
+
+    public String getSystemTypeDescription(File f) {
+        return v.getSystemTypeDescription(f);
+    }
+
+    public boolean isComputerNode(File dir) {
+        return v.isComputerNode(dir);
+    }
+
+    public boolean isDrive(File dir) {
+        return v.isDrive(dir);
+    }
+
+    public boolean isFileSystem(File f) {
+        return v.isFileSystem(f);
+    }
+
+    public boolean isFileSystemRoot(File dir) {
+        return v.isFileSystemRoot(dir);
+    }
+
+    public boolean isFloppyDrive(File dir) {
+        return v.isFloppyDrive(dir);
+    }
+
+    public boolean isHiddenFile(File f) {
+        return v.isHiddenFile(f);
+    }
+
+    public boolean isParent(File folder, File file) {
+        return v.isParent(folder, file);
+    }
+
+    public boolean isRoot(File f) {
+        return v.isRoot(f);
+    }
+
+    public Boolean isTraversable(File f) {
+        return v.isTraversable(f);
+    }
+}
+
+/**
+ * A <code>File</code> that always returns <code>false</code> from
+ * {@link #canWrite()}.  This class is used to work around bugs in
+ * {@link JFileChooser}.
+ */
+class FileWrapper extends File {
+
+    public FileWrapper(File f) {
+        this(f.toString());
+    }
+
+    public FileWrapper(String pathname) {
+        super(pathname);
+    }
+
+    public boolean canWrite() {
+        return false;
     }
 }