Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException

[Moayad Abu Jaber]

Dear rancher,
I write application in applet the applet access the scanner and scanning the page after finish scanning save file into TIFF extension.

check my code below I called it into button action:

 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.bbtech.scanutil;

import com.asprise.util.jtwain.JTwainException;
import com.asprise.util.jtwain.Source;
import com.asprise.util.jtwain.SourceManager;
import com.asprise.util.tiff.TIFFWriter;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.imageio.ImageIO;

/**
 *
 * @author Moayad
 */
public class ScannerUtil {

    private static Source source;
    private static int i;
    private static BufferedImage image;
    private static List<BufferedImage> images = new ArrayList();

    public static synchronized void startScan() {
        //new Runnable() {

        //public void run() {

        try {
            source = SourceManager.instance().getDefaultSource();
            source.open();
            source.setXResolution(300);
            source.setYResolution(300);

            source.setAutomaticDeskew(true);
            source.setUIEnabled(false);
            source.setFeederEnabled(true);
            source.setAutoFeed(true);
            //source.setTransferCount(3);

            do {
                i++;
                image = source.acquireImageAsBufferedImage();
                File tempFile = new File("scaningImage_" + i + ".jpg");
                ImageIO.write(image, "JPG", tempFile);
                tempFile.delete();
            } while (source.hasMoreImages());

            //Timestamp timeStamp = new Timestamp(100000);
            File tifFile = new File("scanning" + new Date().getTime() + ".tif");
            BufferedImage[] tiffImage = new BufferedImage[i];
            images.toArray(tiffImage);
            //
            System.out.println("bufferedImage array is" + tiffImage);
            System.out.println("tiff file is" + tifFile);

            TIFFWriter.createTIFFFromImages(tiffImage, tifFile);
            System.out.println("bufferedImage array is" + tiffImage);
            System.out.println("tiff file is" + tifFile);
        // for allow to read from local drive
            /*AccessController.doPrivileged(new PrivilegedAction() {

        public Object run() {
        try {

        } catch (IOException ie) {
        ie.printStackTrace();
        SourceManager.closeSourceManager();
        }
        return null;
        }
        });*/




        } catch (JTwainException je) {
            je.printStackTrace();
            SourceManager.closeSourceManager();
        } catch (IOException ie) {
            ie.printStackTrace();
            SourceManager.closeSourceManager();
        } finally {

            SourceManager.closeSourceManager();
        }
    }
}

I check these objects "tifFile" and "tiffImage" all of them have a value
the first two rows you will see the value of these objects
you can see the exception below:

 
bufferedImage array is[Ljava.awt.image.BufferedImage;@ce5b1c
tiff file isscanning1246359351603.tif
Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
        at com.asprise.util.tiff.TIFFWriter.createTIFFFromImages(Unknown Source)
        at com.asprise.util.tiff.TIFFWriter.createTIFFFromImages(Unknown Source)
        at com.bbtech.scanutil.ScannerUtil.startScan(ScannerUtil.java:66)
        at com.bbtech.applets.Scanning.button1ActionPerformed(Scanning.java:113)
        at com.bbtech.applets.Scanning.access$100(Scanning.java:21)
        at com.bbtech.applets.Scanning$2.actionPerformed(Scanning.java:54)
        at java.awt.Button.processActionEvent(Button.java:392)
        at java.awt.Button.processEvent(Button.java:360)
        at java.awt.Component.dispatchEventImpl(Component.java:4583)
        at java.awt.Component.dispatchEvent(Component.java:4413)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
BUILD SUCCESSFUL (total time: 12 minutes 12 seconds)

[Ivan Ivanofff]

I have similar problem with JAI.
Check policies, written in java.policy. There must be a string like this: grant codeBase <url> { permission java.security.AllPermission; };
More details you can see here: http://j-integra.intrinsyc.com/support/kb/article.aspx?id=30128

[Moayad Abu Jaber]

Thanks for you replay,
Actually I forgot to post how I solved this problem, In my code I missed to add BufferedImage to ArrayList

really was funny problem