Can't fallback Font to Helvetica in PdfGraphics2D

[admannon]

PLEASE FILL THIS TEMPLATE AS MUCH AS POSSIBLE. REMOVE IRRELEVANT PARTS.

Describe the bug

We can't generate PDF document from code below and got error:

Font creation failed for Helvetica.
java.lang.RuntimeException: Font creation failed for Helvetica.

To Reproduce

Code to reproduce the issue

Unit Test

import com.lowagie.text.Document;
import com.lowagie.text.pdf.LayoutProcessor;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import org.junit.jupiter.api.Test;

import java.awt.*;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.print.*;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

class PdfConverterTest {

    private static int generateContent(Graphics g, PageFormat pf, int i) {
        var   g2 = (Graphics2D) g;
        float h  = (float) pf.getHeight();
        float w  = (float) pf.getWidth();

        Ellipse2D.Double circle = new Ellipse2D.Double();
        Ellipse2D.Double oval   = new Ellipse2D.Double();
        Ellipse2D.Double leaf   = new Ellipse2D.Double();
        Ellipse2D.Double stem   = new Ellipse2D.Double();
        g2.setColor(Color.green);

        double eh = h / 2;
        double ew = w / 2;
        leaf.setFrame(ew - 16, eh - 29, 15.0, 15.0);
        Area leaf1 = new Area(leaf);
        leaf.setFrame(ew - 14, eh - 47, 30.0, 30.0);
        Area leaf2 = new Area(leaf);
        leaf1.intersect(leaf2);
        g2.fill(leaf1);

        // Creates the second leaf.
        leaf.setFrame(ew + 1, eh - 29, 15.0, 15.0);
        leaf1 = new Area(leaf);
        leaf2.intersect(leaf1);
        g2.fill(leaf2);

        g2.setColor(Color.black);

        // Creates the stem by filling the Area resulting from the subtraction of two Area objects created from an
        // ellipse.
        stem.setFrame(ew, eh - 42, 40.0, 40.0);
        Area st1 = new Area(stem);
        stem.setFrame(ew + 3, eh - 47, 50.0, 50.0);
        Area st2 = new Area(stem);
        st1.subtract(st2);
        g2.fill(st1);

        g2.setColor(Color.yellow);

        // Creates the pear itself by filling the Area resulting from the union of two Area objects created by two
        // different ellipses.
        circle.setFrame(ew - 25, eh, 50.0, 50.0);
        oval.setFrame(ew - 19, eh - 20, 40.0, 70.0);

        Area circ = new Area();
        circ.add(new Area(circle));
        circ.add(new Area(oval));
        g2.fill(circ);
        g2.setColor(Color.black);
        g2.setFont(new Font("Arial", Font.PLAIN, 18));
        String      pear    = "Pear";
        FontMetrics metrics = g2.getFontMetrics();
        int         width   = metrics.stringWidth(pear);
        g2.drawString(pear, (w - width) / 2, 20);

        return Printable.PAGE_EXISTS;
    }

    private static PageFormat getPageFormat(double width, double height, int orientation) {
        PageFormat pageFormat = new PageFormat();
        Paper      paper      = pageFormat.getPaper();
        paper.setSize(width, height);
        paper.setImageableArea(0, 0, paper.getWidth(), paper.getHeight());
        pageFormat.setPaper(paper);
        pageFormat.setOrientation(orientation);
        return pageFormat;
    }

    @Test
    void generateFromPageable() throws IOException, PrinterException {
        Book book = new Book();
        book.append(
                PdfConverterTest::generateContent,
                getPageFormat(595.2755905511812, 841.8897637795277, PageFormat.PORTRAIT));

        LayoutProcessor.enable();

        byte[] pdfContentByte;
        try (var outputStream = new ByteArrayOutputStream()) {
            try (var document = new Document()) {
                var writer = PdfWriter.getInstance(document, outputStream);
                document.open();

                var contentByte = writer.getDirectContent();
                var totalPages  = book.getNumberOfPages();
                for (var i = 0; i < totalPages; i++) {
                    var   pageFormat = book.getPageFormat(i);
                    var   printable  = book.getPrintable(i);
                    float pageW      = (float) pageFormat.getWidth();
                    float pageH      = (float) pageFormat.getHeight();
                    float marginL    = (float) pageFormat.getImageableX();
                    float marginT    = (float) pageFormat.getImageableY();
                    float marginR    = (float) (pageW - pageFormat.getImageableWidth());
                    float marginB    = (float) (pageH - pageFormat.getImageableHeight());

                    document.setPageSize(new com.lowagie.text.Rectangle(pageW, pageH));
                    document.setMargins(marginL, marginR, marginT, marginB);
                    document.newPage();

                    Graphics2D g2 = contentByte.createGraphics(pageW, pageH);
                    printable.print(g2, pageFormat, i);
                    g2.dispose();
                    contentByte.sanityCheck();
                }
            }
            pdfContentByte = outputStream.toByteArray();
        }

        try (var inputStream = new ByteArrayInputStream(pdfContentByte)) {
            new PdfReader(inputStream);
        }
    }
}

Expected behavior

This code should generate a PDF normally

System

(please complete the following information)

• OS: MacOS 14.4.1
• Used font: new Font(Font.SANS_SERIF, Font.PLAIN, 12)
• OpenPDF version: 2.0.2

[a-leithner]

I'm observing the same problem. However, in my case, I can generate one PDF without problems, but subsequent PDFs fail with this exact exception, though I'm also getting

Caused by: java.io.IOException: Helvetica not found as file or resource.
	at com.lowagie.text.pdf.LayoutProcessor.loadFont(LayoutProcessor.java:307)

If that's related, I'm using the technique discussed by V-F in #1078 to render an SVG image.

[a-leithner]

Oh, and version 2.0.1 of OpenPDF works fine, only 2.0.2 breaks.

[asturio]

Ok, that is strange. Maybe there is a problem or difference resolving the font-resource. There were some changes so the tests also work on Windows.

Keeping the tests compatible in Windows, Unix and Mac is not easy, as I only have access to the first 2.

@admannon can you verify, that the error don't occur with 2.0.1?

[asturio]

It's also a strange behaviour, as helvetica may be a font provided by the OS, but there are helvetica-font-files also in the JAR.

[a-leithner]

Well, I'm on Linux and don't have any form of Helvetica installed. Could this influence something?

[admannon]

Ok, that is strange. Maybe there is a problem or difference resolving the font-resource. There were some changes so the tests also work on Windows.

Keeping the tests compatible in Windows, Unix and Mac is not easy, as I only have access to the first 2.

@admannon can you verify, that the error don't occur with 2.0.1?

Apologies for the delayed response. Yes, this error don't occur with OpenPDF v2.0.1. The attached PDF was generated using OpenPDF v2.0.1.