DrawableWriter.write hangs on PDF pie chart

[sylvainhalle]

Consider this main file (sorry, it is a bit verbose, but required to reproduce the bug):

package ca.uqac.lif.labpal.export;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;

import de.erichseifert.gral.data.DataSource;
import de.erichseifert.gral.graphics.Insets2D;
import de.erichseifert.gral.io.data.DataReader;
import de.erichseifert.gral.io.data.DataReaderFactory;
import de.erichseifert.gral.io.plots.DrawableWriter;
import de.erichseifert.gral.io.plots.DrawableWriterFactory;
import de.erichseifert.gral.plots.PiePlot;

public class Reprogral
{

  public static void main(String[] args) throws IOException
  {
    DataSource ds = readData("/tmp/share.csv");
    PiePlot plot = new PiePlot(ds);
    plot.setInsets(new Insets2D.Double(20d, 60d, 60d, 40d));
    plot.getTitle().setText("Something");
    plot.setLegendVisible(true);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DrawableWriter wr = DrawableWriterFactory.getInstance().get("application/pdf");
    try
    {
      wr.write(plot, baos, 640, 480);
      baos.flush();
      byte[] bytes = baos.toByteArray();
      baos.close();
    }
    catch (IOException e)
    {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
  
  public static DataSource readData(String filename) throws IOException {
    FileInputStream dataStream = new FileInputStream(filename);
    DataReaderFactory factory = DataReaderFactory.getInstance();
    DataReader reader = factory.get("text/tab-separated-values");
    try {
        DataSource data = reader.read(dataStream, Double.class);
        return data;
    } finally {
        dataStream.close();
    }
}
}

The contents of share.csv being:

10.0
15.0
20.0
25.0
30.0

Expected result: the program puts the image data into the bytes array and terminates.

Observed result: the program never terminates; debugging shows it stalls on the line wr.write(...)

Additional info: replacing application/pdf by image/png as the image type produces the correct result. The bug seems to occur only with the PDF image type.

By the way, thanks for this great library! I am using it in one of my projects called LabPal.