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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 options with text of signature
PdfSignTextOptions signOptions = new PdfSignTextOptions("John Smith");
final PdfSaveOptions saveOptions = new PdfSaveOptions();
saveOptions.setOutputType(OutputType.String);
saveOptions.setOutputFileName("signed_output.epub");
//
saveOptions.setFileFormat(PdfSaveFileFormat.Epub);
// sign document
String signedPath = handler.sign(CommonUtilities.getStoragePath(fileName), signOptions, saveOptions);
System.out.println("Signed file path is: " + signedPath);