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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 image signature options with relative path - image file stores in config.ImagesPath folder
PdfSignTextOptions signOptions = new PdfSignTextOptions("John Smith");
// setup colors settings
signOptions.setBackgroundColor(Color.BLUE);
// setup text color
signOptions.setForeColor(Color.YELLOW);
// setup opacity options
signOptions.setOpacity(0.35);
// setup Font options
signOptions.getFont().setBold(true);
signOptions.getFont().setFontFamily("Arial");
signOptions.getFont().setFontSize(36);
final SaveOptions saveOptions = new SaveOptions();
saveOptions.setOutputType(OutputType.String);
saveOptions.setOutputFileName("signed_output.pdf");
// sign document
String signedPath = handler.sign(CommonUtilities.getStoragePath(fileName), signOptions, saveOptions);
System.out.println("Signed file path is: " + signedPath);