NullPointerException

[Sarika Sukumaran]

Why "BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));" returns null value?

 Document document = new Document(PageSize.A4);        
	    PdfReader reader = new PdfReader(".\\A4SizePdf.pdf");         
	    PdfWriter writer = PdfWriter.getInstance(document,  new FileOutputStream(".\\new.pdf"));  
	    document.open(); 
	    PdfImportedPage page = writer.getImportedPage(reader, 1);  
	    com.lowagie.text.Image instance = com.lowagie.text.Image.getInstance(page);  

		byte [] imageBytes = instance.toString().getBytes();
	    InputStream in = new ByteArrayInputStream(imageBytes);  
	    BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes)); 	 

[Tim Moores]

I'll bet you dollars to donuts that "instance.toString()" does not return anything remotely resembling what you seem to assume it returns.

[Sarika Sukumaran]

Thanks for your response. Could you please help me to achieve the target?

[Tim Moores]

Depends on what you intend to do. It looks like you're trying to convert a PDF to a (series of) images. I've never tried that, but I noticed that the com.lowagie.text.Image class has methods called getOriginalData and getOriginalType; those might be useful for that task.

If that's all you're trying to do, you might check out the PDFBox library, which has this functionality (amongst others).