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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 digital verification options
WordsVerifyTextOptions verifyOptions = new WordsVerifyTextOptions("John Smith");
verifyOptions.getPagesSetup().setFirstPage(true);
//verify document
VerificationResult result = handler.verify(CommonUtilities.getStoragePath(fileName), verifyOptions);
System.out.println("Signed file verification result: " + result.isValid());