PDF encryption error in Java iText - eclipse

Question

I want to encrypt my PDF but there seems to be an error. I am using iText and Eclipse.
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Date;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.exceptions.InvalidPdfException;
public class EncryptionPdf {
public static void main(String[] args) throws IOException, DocumentException
{
PdfReader reader = new PdfReader("C:/Users/Binaday/Desktop/PDF RESULTS/Booking Form.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("C:/Users/Binaday/Desktop/PDF RESULTS/Booking Form2.pdf"));
stamper.setEncryption("reader_password".getBytes(), "permission_password".getBytes(), ~(PdfWriter.ALLOW_COPY | PdfWriter.ALLOW_PRINTING ), PdfWriter.STANDARD_ENCRYPTION_128);
stamper.close();
}
}
Here's the error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/ASN1Encodable
at com.itextpdf.text.pdf.PdfEncryption.(PdfEncryption.java:149)
at com.itextpdf.text.pdf.PdfWriter.setEncryption(PdfWriter.java:2119)
at EncryptionPdf.main(EncryptionPdf.java:16)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.ASN1Encodable
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 3 more

Answer 1

When you look at the POM file for iText, you see the following dependencies:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.49</version>
<type>jar</type>
<scope>compile</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.49</version>
<type>jar</type>
<scope>compile</scope>
<optional>true</optional>
</dependency>
This means that you need the bcprov and the bcpkix jars version 1.49 from Bouncycastle: http://bouncycastle.org/java.html
If you are not using iText 5.5.0, please check the POM file as older version of iText might require older versions of BouncyCastle.