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Read PDF to add some metadata

import java.io.ByteArrayOutputStream; import java.io.FileOutputStream; import java.util.HashMap; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfReader; import com.lowagie.text.pdf.PdfStamper; import com.lowagie.text.pdf.PdfWriter; import com.lowagie.text.xml.xmp.XmpWriter; public class HelloWorldAddMetadata {   public static void main(String[] args) throws Exception {     Document document = new Document();     PdfWriter.getInstance(document, new FileOutputStream("HelloWorld.pdf"));     document.open();     document.add(new Paragraph("Hello World"));     document.close();     PdfReader reader = new PdfReader("HelloWorld.pdf");     System.out.println("Tampered? " + reader.isTampered());     PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(         "HelloWorldStampedMetadata.pdf"));     System.out.println("Tampered? " + reader.isTampered());     HashMap<String, String> info = reader.getInfo();     info.put("Subject", "Hello World");     info.put("Author", "your name");     info.put("Keywords", "iText pdf");     info.put("Title", "Hello World stamped");     info.put("Creator", "your name");     stamper.setMoreInfo(info);     ByteArrayOutputStream baos = new ByteArrayOutputStream();     XmpWriter xmp = new XmpWriter(baos, info);     xmp.close();     stamper.setXmpMetadata(baos.toByteArray());     stamper.close();   } }