zodziu kaip sakiau neesu java specas, tai iklijuoju koda, gal kas ka  
izvelgs...

kai i db rasau su sia komanda: fileUpload1.getUploadedFile().getBytes()  
viskas ok, t.y. foto iraso is bet kurios narsykles

su Opera ir firefax neveikia mazinimo metodas:
public byte[] getPreview(byte[] imageBytes, String format, int  
previewWidth, int previewHeight ) {
         ByteArrayOutputStream result = new ByteArrayOutputStream();
         int newWidth;
         int newHeight;
         try {
             ByteArrayInputStream byteInput = new  
ByteArrayInputStream(imageBytes);
             BufferedImage image = ImageIO.read(byteInput);
             if (image.getWidth() <= previewWidth && image.getHeight() <=  
previewHeight) // picture is so small that it fits as preview itself
             {
                 return imageBytes;
             }
             if (previewWidth * image.getHeight() < previewHeight *  
image.getWidth()) {
//                scale=previewWidth/image.getWidth();
                 newWidth = previewWidth;
                 newHeight = image.getHeight() * previewWidth /  
image.getWidth();
             } else {
//                scale=previewHeight/image.getHeight();
                 newHeight = previewHeight;
                 newWidth = image.getWidth() * previewHeight /  
image.getHeight();
             }
             BufferedImage newImage = new BufferedImage(newWidth,  
newHeight, BufferedImage.TYPE_INT_RGB);
             Graphics2D g2d = (Graphics2D) newImage.createGraphics();
             g2d.drawImage(image, 0, 0, newWidth, newHeight , null);
             ImageIO.write(newImage, format, result);
         } catch (Exception e) {
             error("Klaida mazinant foto: " + e.getMessage());
         }
         return result.toByteArray();
     }

pas mane lokaliai kompe viskas ok, darbineje aplinkoje su IE nepadaro  
thumbnailo 50x50px, bet sumazina 800x800 ir iraso. su Opera ar Forefox  
neiraso nei thumbnailo, nei 800x800px foto. primenu, kad viskas veike ir  
darbineje aplinkoje, kol po neaiskiu aplinkybiu pradejo nebeveikti...