Shows a case of a wrong line-height interpretation

LineHeightIssue.java

package html_to_pdf;

import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.List;
import com.lowagie.text.ListItem;
import com.lowagie.text.Paragraph;
import com.lowagie.text.html.simpleparser.HTMLWorker;
import com.lowagie.text.html.simpleparser.StyleSheet;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.StringReader;

public class LineHeightIssue {

  private static final String HTML = "<p>Title</p><p style=\"line-height:2\">Testing text</p>";

  public static void main(String args[]) throws DocumentException, IOException {
    FileOutputStream out = new FileOutputStream("test.pdf");
    Document document = new Document();
    PdfWriter pdfWriter = PdfWriter.getInstance(document, out);
    document.open();
    PdfPTable table = getPdfPTable();
    document.add(table);
    document.close();
  }

  private static PdfPTable getPdfPTable() throws IOException {
    PdfPTable table = new PdfPTable(1);
    table.addCell(getGoodPdfPCell());
    table.addCell(getBadPdfPCell());
    return table;
  }

  /*
   * Everything is fine. Applied a workaround to fix the leading.
   */
  private static PdfPCell getGoodPdfPCell() throws IOException {
    PdfPCell cell = new PdfPCell();
    java.util.List<?> list = HTMLWorker.parseToList(new StringReader(HTML), new StyleSheet());
    list.forEach(element -> {
      if (element instanceof Paragraph) {
        final Paragraph paragraph = (Paragraph) element;
        if (paragraph.getMultipliedLeading() == 0 && paragraph.getLeading() < paragraph.getFont()
            .getCalculatedSize()) {
          paragraph.setMultipliedLeading(paragraph.getLeading());
        }
      }
      cell.addElement((Element) element);
    });
    return cell;
  }

  /*
   * Shows a case of a wrong line-height interpretation. The paragraphs overlaps.
   */
  private static PdfPCell getBadPdfPCell() throws IOException {
    PdfPCell cell = new PdfPCell();
    java.util.List<?> list = HTMLWorker.parseToList(new StringReader(HTML), new StyleSheet());
    list.forEach(element -> cell.addElement((Element) element));
    return cell;
  }
}