UI does not update when using ProgressMonitorInputStream in Swing to control compression of a compressed file

I am working on a swing app which is based on an embedded H2 database. Since I do not want to link the database to the application (the db is updated frequently and I want new users of the application to start with a recent copy), I have implemented a solution that downloads a compressed copy of the db when the application is first launched and retrieved. Since the checkout process can be slow, I added a ProgressMonitorInputStream to show the progress of the checkout process - unfortunately, when the checkout starts, the progress dialog appears, but it doesn't update at all. Events seem to flow through the event dispatch thread. Here's the way:

public static String extractDbFromArchive(String pathToArchive) {
    if (SwingUtilities.isEventDispatchThread()) {
        System.out.println("Invoking on event dispatch thread");
    }

    // Get the current path, where the database will be extracted
    String currentPath = System.getProperty("user.home") + File.separator + ".spellbook" + File.separator;
    LOGGER.info("Current path: " + currentPath);

    try {
        //Open the archive
        FileInputStream archiveFileStream = new FileInputStream(pathToArchive);
        // Read two bytes from the stream before it used by CBZip2InputStream

        for (int i = 0; i < 2; i++) {
            archiveFileStream.read();
        }

        // Open the gzip file and open the output file
        CBZip2InputStream bz2 = new CBZip2InputStream(new ProgressMonitorInputStream(
                              null,
                              "Decompressing " + pathToArchive,
                              archiveFileStream));
        FileOutputStream out = new FileOutputStream(ARCHIVED_DB_NAME);

        LOGGER.info("Decompressing the tar file...");
        // Transfer bytes from the compressed file to the output file
        byte[] buffer = new byte[1024];
        int len;
        while ((len = bz2.read(buffer)) > 0) {
            out.write(buffer, 0, len);
        }

        // Close the file and stream
        bz2.close();
        out.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    try {
        TarInputStream tarInputStream = null;
        TarEntry tarEntry;
        tarInputStream = new TarInputStream(new ProgressMonitorInputStream(
                              null,
                              "Extracting " + ARCHIVED_DB_NAME,
                              new FileInputStream(ARCHIVED_DB_NAME)));

        tarEntry = tarInputStream.getNextEntry();

        byte[] buf1 = new byte[1024];

        LOGGER.info("Extracting tar file");

        while (tarEntry != null) {
            //For each entry to be extracted
            String entryName = currentPath + tarEntry.getName();
            entryName = entryName.replace('/', File.separatorChar);
            entryName = entryName.replace('\\', File.separatorChar);

            LOGGER.info("Extracting entry: " + entryName);
            FileOutputStream fileOutputStream;
            File newFile = new File(entryName);
            if (tarEntry.isDirectory()) {
                if (!newFile.mkdirs()) {
                    break;
                }
                tarEntry = tarInputStream.getNextEntry();
                continue;
            }

            fileOutputStream = new FileOutputStream(entryName);
            int n;
            while ((n = tarInputStream.read(buf1, 0, 1024)) > -1) {
                fileOutputStream.write(buf1, 0, n);
            }

            fileOutputStream.close();
            tarEntry = tarInputStream.getNextEntry();

        }
        tarInputStream.close();
    } catch (Exception e) {
    }

    currentPath += "db" + File.separator + DB_FILE_NAME;

    if (!currentPath.isEmpty()) {
        LOGGER.info("DB placed in : " + currentPath);
    }

    return currentPath;
}

      

        
        
        
      

    

This method is called on the event dispatch thread (SwingUtilities.isEventDispatchThread () returns true), so the UI components must be updated. I have not implemented this as a SwingWorker since I need to wait for the fetch anyway before I can continue to initialize the program. This method is called before the main JFrame of the application is visible. I don't want the SwingWorker + based solution to change the listeners - I think ProgressMonitorInputStream is exactly what I need, but I think I am not doing anything right. I am using Sun JDK 1.6.18. Any help would be greatly appreciated.