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Add XMP metadata automatically, based on the PDF metadata

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfWriter; public class MainClass {   public static void main(String[] args) throws Exception {     Document document = new Document();     PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));     document.addTitle("title");     document.addSubject("subject");     document.addKeywords("keywords");     document.addCreator("creator");     document.addAuthor("author");     writer.createXmpMetadata();     document.open();     document.add(new Paragraph("Hello World"));     document.close();   } }