exception

[rakhi sinha]

how to remove thie exception....


Exception in thread "main" java.lang.NullPointerException
at com.itextpdf.text.pdf.PdfSignatureAppearance.getAppearance(PdfSignatureAppearance.java:409)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:950)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:897)
at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:192)
at signature.sig.main(sig.java:81)

[Arunkumar Chinnadurai]

rakhi sinha wrote:how to remove thie exception....


Exception in thread "main" java.lang.NullPointerException
at com.itextpdf.text.pdf.PdfSignatureAppearance.getAppearance(PdfSignatureAppearance.java:409)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:950)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:897)
at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:192)
at signature.sig.main(sig.java:81)

Please check the sig.java file in 81st line..

[rakhi sinha]

Arunkumar Chinnadurai wrote:

rakhi sinha wrote:how to remove thie exception....


Exception in thread "main" java.lang.NullPointerException
at com.itextpdf.text.pdf.PdfSignatureAppearance.getAppearance(PdfSignatureAppearance.java:409)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:950)
at com.itextpdf.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:897)
at com.itextpdf.text.pdf.PdfStamper.close(PdfStamper.java:192)
at signature.sig.main(sig.java:81)

Please check the sig.java file in 81st line..

I am using following code but sign.pdf of 0kb is being created.....

package signature;

import com.itextpdf.text.Document;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.*;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import com.itextpdf.text.pdf.*;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import java.io.FileInputStream;
import java.security.cert.Certificate;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bouncycastle.jce.provider.symmetric.SEED;

public class sig {

		public static void main(String[] args)  throws 
	        IOException, DocumentException {
		Document document = new Document();
		//PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream("C:/Documents and Settings/Administrator/workspace/signature/a.pdf"));
		//document.open();
		//PdfFormField field = PdfFormField.createSignature(writer);
		//field.setWidget(new Rectangle(72, 732, 144, 780),
		//PdfAnnotation.HIGHLIGHT_INVERT);
		//field.setFieldName("mySig");
		//field.setFlags(PdfAnnotation.FLAGS_PRINT);
	   // field.setPage();
		//field.setMKBorderColor(BaseColor.BLACK);
		//field.setMKBackgroundColor(BaseColor.WHITE);
		//PdfAppearance tp= PdfAppearance.createAppearance(writer, 72, 48);
		//tp.rectangle(0.5f, 0.5f, 71.5f, 47.5f);
		//tp.stroke();
		//field.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, tp);
		//writer.addAnnotation(field);
		KeyStore ks= null;
        try {
            ks = KeyStore.getInstance(KeyStore.getDefaultType());
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            ks.load(
            new FileInputStream("C:/Documents and Settings/Administrator/signer1.keystore"),"abcdef".toCharArray());
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (CertificateException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		PrivateKey key= null;
        try {
            key = (PrivateKey) ks.getKey("signer1_cacert", "abcdef".toCharArray());
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnrecoverableKeyException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		Certificate[] chain= null;
        try {
            chain = ks.getCertificateChain("signer1_cacert");
        } catch (KeyStoreException ex) {
            Logger.getLogger(SEED.class.getName()).log(Level.SEVERE, null, ex);
        }
		PdfReader reader = new PdfReader("C:/Documents and Settings/Administrator/workspace/signature/a.pdf");
		FileOutputStream os = new FileOutputStream("Sign.pdf");
		PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
		PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
		appearance.setCrypto(key, chain, null,PdfSignatureAppearance.SELF_SIGNED);
		appearance.setReason("It's personal.");
		appearance.setLocation("signer1_cacert");
		appearance.setVisibleSignature(new Rectangle(160,732,232,780), 1, null);
		document.close();
	}
}

[Added code tags - see UseCodeTags for details]

[Matthew Brown]

You create a Document object on 27, close it on lone 81, but in between you never actually do anything with it, so it's a completely empty document. That's why you're getting the exception. It's probably related to the reason you're getting an empty PDF as well, because it suggests there's something you ought to be doing that you've omitted.

[rakhi sinha]

Matthew Brown wrote:You create a Document object on 27, close it on lone 81, but in between you never actually do anything with it, so it's a completely empty document. That's why you're getting the exception. It's probably related to the reason you're getting an empty PDF as well, because it suggests there's something you ought to be doing that you've omitted.

but between these lines i am putting signature on this document.

[Matthew Brown]

rakhi sinha wrote:but between these lines i am putting signature on this document.

Where? Where do you do it on this document? Because the variable document isn't referred to between those lines (except on lines 28/29, but you've commented those out).