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Combine the different PDFs with forms and fields into one

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.PageSize; import com.lowagie.text.Rectangle; import com.lowagie.text.pdf.BaseFont; import com.lowagie.text.pdf.GrayColor; import com.lowagie.text.pdf.PdfContentByte; import com.lowagie.text.pdf.PdfCopyFields; import com.lowagie.text.pdf.PdfReader; import com.lowagie.text.pdf.PdfWriter; import com.lowagie.text.pdf.TextField; public class HelloWorldCopyFields {   public static void main(String[] args) throws Exception {     createPdf("1.pdf", "field1", "value1.1");     createPdf("2.pdf", "field1", "value1.2");     createPdf("3.pdf", "field2", "value2");     PdfCopyFields copy = new PdfCopyFields(new FileOutputStream(         "CopyFields.pdf"));     copy.addDocument(new PdfReader("1.pdf"));     copy.addDocument(new PdfReader("2.pdf"));     copy.addDocument(new PdfReader("3.pdf"));     copy.close();   }   private static void createPdf(String filename, String field, String value)       throws Exception {     Document document = new Document(PageSize.A4);     PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(         filename));     document.open();     BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI,         BaseFont.NOT_EMBEDDED);     PdfContentByte cb = writer.getDirectContent();     cb.beginText();     cb.setFontAndSize(bf, 12);     cb.moveText(36f, 788);     cb.showText("Hello");     cb.endText();     TextField tf = new TextField(writer, new Rectangle(67, 785, 340, 800),         field);     tf.setFontSize(12);     tf.setFont(bf);     tf.setText(value);     tf.setTextColor(new GrayColor(0.5f));     writer.addAnnotation(tf.getTextField());     document.close();   } }