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// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
// setup Signature configuration
SignatureConfig signConfig = CommonUtilities.getConfiguration();
// instantiating the conversion handler
SignatureHandler<String> handler = new SignatureHandler<String>(signConfig);

// setup verification options
CellsVerifyBarcodeOptions verifyOptions = new CellsVerifyBarcodeOptions();
// verify only page with specified number
verifyOptions.setDocumentPageNumber(1);
// verify all pages of a document if true
verifyOptions.setVerifyAllPages(true);
// barcode type
verifyOptions.setEncodeType(BarcodeTypes.CODE_39_STANDARD);
//If verify option Text is set, it will be searched in Title, Subject and Contents
verifyOptions.setText("12345678");
//verify document
VerificationResult result = handler.verify(fileName, verifyOptions);
System.out.println("Verification cells file with Barcode signature " + result.isValid());