Convert EMF+ (not WMF / EMF) file to PNG in java

Question

Problem:

I have a an image of Enhanced Metafile Fromat Plus Extension EMF+. I need to convert this file to to a PNG image file with java.

Attempts to resolve problem in java:

1. Apache Batik does not support EMF+ format (Batik supports WMF only format).

2. FreeHEP does not support EMF+ too. It can convert EMF to SVG and then SVG to PNG. I hoped it can help:

   EMF2SVG.main( new String[] {inputMetaFileName,ontputSvgFileName});
   

   this statement must convert EMF to SVG, but gives an exception:

   java.lang.NullPointerException at org.freehep.graphicsio.exportchooser.AbstractExportFileType.getGraphics(AbstractExportFileType.java:261) at org.freehep.graphicsio.exportchooser.AbstractExportFileType.exportToFile(AbstractExportFileType.java:248) at org.freehep.graphicsio.exportchooser.AbstractExportFileType.exportToFile(AbstractExportFileType.java:282) at org.freehep.graphicsio.emf.EMFConverter.export(EMFConverter.java:81) at org.freehep.graphicsio.emf.EMF2SVG.main(EMF2SVG.java:27)

3. I used code from here:

   try {
       // read the EMF file
       EMFRenderer emfRenderer = new EMFRenderer( new EMFInputStream(
           new ByteArrayInputStream(emfBytes)));
   
       EMFPanel emfPanel = new EMFPanel();
       emfPanel.setRenderer(emfRenderer);
   
       // prepare Graphics2D
       FileOutputStream svg = new FileOutputStream("svg.svg");
       SVGGraphics2D graphics2D = new SVGGraphics2D (svg, emfPanel);
   
       // export to SVG
       graphics2D.startExport();
       emfPanel.print(graphics2D);
       graphics2D.endExport();
       svg.flush();
       svg.close();
   } catch (IOException e) {
       e.printStackTrace();
   }
   

   This code creates SVG file, but it file has no image.