blobs in a client/server environment

Hello,
I have been playing around with storing images with setBinaryStream and
getBinaryStream for a couple of days now, but I am continually running
into a problem.  I don't know if I am getting the data in the right
format or not, but I am not able to get my image from the database.
I have a client/server environment and when I get the image back from
the database that is done on the server.  So I do not want to write the
InputStream as a file, instead as an array of bytes which are sent back
to the client.
I recive no errors when putting the image into the database and getting
the  image out of the database, where I get my error is when I try to
generate the image from the array of bytes.

To put the image into the database (no errors):
        FileInputStream fis = new FileInputStream(file);
        PreparedStatement ps = con.prepareStatement("update
userpreferences set image=?, time=? where username=?");
        ps.setBinaryStream(1, fis, length);
        ps.setInt(2, (int)new java.util.Date().getTime());
        ps.setString(3, user);
        ps.executeUpdate();
        ps.close();
        fis.close();
        con.commit();
        con.close();

To get the image from the database and put it into an array of bytes (no
errors):
        con.setAutoCommit(false);
        PreparedStatement ps = con.prepareStatement("select image from
userpreferences where username=?");
        ps.setString(1, user);
        ResultSet rs = ps.executeQuery();
        con.commit();
        if(rs != null)
          if(rs.next()){
            InputStream is = rs.getBinaryStream(1);
            ByteArrayOutputStream byteStream = new
ByteArrayOutputStream();
             int data;
             while ((data = is.read()) != -1)
                byteStream.write((byte)data);
            byte[] buf = byteStream.toByteArray();

            is.close();
            rs.close();
            con.close();
            return buf;


I get my error when I try to create my image with the library Jimi.
byte[] data = (got bytes from above);
Image image = Jimi.getImage(new ByteArrayInputStream(data));

The error stack trace I get is:
        com.sun.jimi.core.JimiException: Error creating image.
        at
com.sun.jimi.core.raster.JimiRasterImageImporter.importImage(JimiRasterImageImporter.java:48)
        at com.sun.jimi.core.Jimi.createRasterImage(Jimi.java:929)
        at com.sun.jimi.core.Jimi.createRasterImage(Jimi.java:720)
        at com.sun.jimi.core.Jimi.createRasterImage(Jimi.java:699)
        at com.sun.jimi.core.Jimi.putImage(Jimi.java:587)
        at com.sun.jimi.core.Jimi.putImage(Jimi.java:575)
        at org.opensimpx.client.gui.ClientGUI.setupGUI(ClientGUI.java:216)
        at org.opensimpx.client.gui.ClientGUI.<init>(ClientGUI.java:147)
        at org.opensimpx.client.gui.ClientGUI.main(ClientGUI.java:419)
        at org.opensimpx.client.login.Login.startClient(Login.java:535)
        at org.opensimpx.client.login.Login.main(Login.java:340)

Is this because of how I handled my data, are the bytes bad, do I need
to convert them back to a file since I put them into the database from a
file?

Any help would be greatly appreciated,
Thanks in advanced.
Matt