[Slightly OT] coercing AWT/image libraries to release resources

[Robert Hunt]

I've got a servlet that produces thumbnail images on-the-fly (using TC 
5.0.25, JDK 1.4.2).  Once the servlet becomes active, it gobbles about 30mb 
per servlet/instance.  I've gone through and tried to apply as many 
flush()/dispose()/gc()/etc. methods as I could find, but still, the memory 
remains allocated.  Has anyone found a way to coerce the AWT (or appropriate 
Java imaging class) into releasing the memory?


The code (from doGet( request, response) method):
====================================================
       ImageIcon imgIcon = null;
       Image img = null;
       try {
           imgIcon = new ImageIcon( jpegFile );    // this is the point at 
which memory swells to like 30mb.
           }
       catch ( Exception e )
           {
           e.printStackTrace();
           response.sendError( HttpServletResponse.SC_NOT_FOUND, 
filename );
           }
       img = imgIcon.getImage();
       imgIcon = null;

       // Determine the scale.
       double scale = Math.min( (double) h / (double) img.getHeight( null )
                              , (double) w / (double) img.getWidth( null )
                              );
       // Determine size of new image.
       int scaledW = (int)( scale * img.getWidth( null ) );
       int scaledH = (int)( scale * img.getHeight( null ) );
       BufferedImage thumb = new BufferedImage( scaledW, scaledH, 
BufferedImage.TYPE_INT_RGB );

       // Set the scale.
       AffineTransform tx = new AffineTransform();
       if ( scale < 1.0d ) tx.scale( scale, scale );
       // Paint image.
       Graphics2D g2d = thumb.createGraphics();
       g2d.drawImage( img, tx, null );
       g2d.dispose();
       g2d = null;
       img.flush();
       img = null;
       OutputStream out = response.getOutputStream();
       ImageIO.write( thumb, ext, out );
       thumb.flush();
       thumb = null;
====================================================

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