✔ Java, Bild mit Webcam

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*; 
import javax.media.util.*;
import com.sun.image.codec.jpeg.*;
import javax.media.format.RGBFormat;
//import com.sun.media.protocol.v4l.DataSource;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.media.Buffer;
import javax.imageio.ImageIO;

class Main
{   
    @SuppressWarnings("restriction")
	public static void main(String[] args) throws Exception
    {   	
        CaptureDeviceInfo deviceInfo = CaptureDeviceManager.getDevice("vfw:Microsoft WDM Image Capture (Win32):0");
        if(deviceInfo == null)
        {
            System.out.println("no device found");
        }        
        
        System.out.println(deviceInfo);
        
        Player player = Manager.createRealizedPlayer(deviceInfo.getLocator());
        player.start();        
    
        
        FrameGrabbingControl frameGrabber = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
   
        Buffer buf = frameGrabber.grabFrame();

        Image img = (new BufferToImage((VideoFormat)buf.getFormat()).createImage(buf));
  

        ImageIO.write((RenderedImage)img, "png", new File("test.png")); 

        player.close();
        player.deallocate();
    }    
}

Exception in thread "main" java.lang.IllegalArgumentException: image == null!
	at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(Unknown Source)
	at javax.imageio.ImageIO.getWriter(Unknown Source)
	at javax.imageio.ImageIO.write(Unknown Source)
	at game.Main.main(Main.java:45)

 ImageIO.write((RenderedImage)img, "png", new File("test.png"));

Thread.sleep(2500);