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// For complete examples and data files, please go to https://github.com/groupdocs-annotation/GroupDocs.Annotation-for-Java
try {
	AnnotationConfig cfg = Utilities.getConfiguration();
	AnnotationImageHandler annotator = new AnnotationImageHandler(cfg);
	annotator.getDocumentDataHandler();
	InputStream cleanPdf = new FileInputStream(Utilities.storagePath + File.separator + fileName);
	List<AnnotationInfo> annotations = new ArrayList<AnnotationInfo>();
	// Area annotation with 2 replies
	AnnotationInfo areaAnnnotation = new AnnotationInfo();
	areaAnnnotation.setAnnotationPosition(new Point(852.0, 59.0));
	final AnnotationReplyInfo[] annotationReplyInfos = { new AnnotationReplyInfo() {
		{
			setMessage("Hello!");
			setRepliedOn(Calendar.getInstance().getTime());
			setUserName("John");
		}
	}, new AnnotationReplyInfo() {
		{
			setMessage("Hi!");
			setRepliedOn(Calendar.getInstance().getTime());
			setUserName("Judy");
		}
	} };
	areaAnnnotation.setReplies(annotationReplyInfos);
	areaAnnnotation.setBackgroundColor(11111111);
	areaAnnnotation.setBox(new Rectangle(300f, 200f, 88f, 37f));
	areaAnnnotation.setPageNumber(0);
	areaAnnnotation.setPenColor(2222222);
	areaAnnnotation.setPenStyle((byte) 1);
	areaAnnnotation.setPenWidth((byte) 1);
	areaAnnnotation.setType(AnnotationType.Area);
	areaAnnnotation.setCreatorName("Anonym A.");
	annotations.add(areaAnnnotation);
	// Add annotation to the document
	InputStream result = annotator.exportAnnotationsToDocument(cleanPdf, annotations, DocumentType.Pdf);
	// Save result stream to file.
	OutputStream fileStream = new FileOutputStream(
			Utilities.outputPath + File.separator + "annotated-area.pdf");
	IOUtils.copy(result, fileStream);

} catch (Exception e) {
	System.out.println("Exception :" + e.getMessage());
	e.printStackTrace();
}