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Event for closing

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfAction; import com.lowagie.text.pdf.PdfContentByte; import com.lowagie.text.pdf.PdfDestination; 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.open();     document.add(new Paragraph("event for closing"));     writer.setAdditionalAction(PdfWriter.DOCUMENT_CLOSE, PdfAction.javaScript(         "app.alert('Thank you for reading this document.');\r", writer));          document.close();   } }