Why do I get a BouncyCastle NoClassDefFoundError?

I want to encrypt my PDF but there seems to be an error.

31st May 2016

Here is the code:

PdfReader reader = new PdfReader("my.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("new.pdf"));
stamper.setEncryption("reader_password".getBytes(), "permission_password".getBytes(),
Here's the error I get:

Exception in thread "main" java.lang.NoClassDefFoundError: org/bouncycastle/asn1/ASN1Encodable

Posted on StackOverflow on May 19, 2014 by wizclark99

When you look at the POM file for iText, you see the following dependencies:


This means that you need the bcprov and the bcpkix jars version 1.49 from Bouncycastle. Please check your POM file.

In iText 7 PDF encryption should be done like this:

PdfReader reader = new PdfReader("my.pdf");
WriterProperties props = new WriterProperties()
        .setStandardEncryption("reader_password".getBytes(), "permission_password".getBytes(), EncryptionConstants.ALLOW_PRINTING,
                EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA);
PdfWriter writer = new PdfWriter(new FileOutputStream("new.pdf"), props);
PdfDocument pdfDoc = new PdfDocument(reader, writer);



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