[Geotools-gt2-users] Renderer freezes on SVG export

[Oehler, P. <Phi...@is...>]

Hi,

I want to write a map created by Geotools to a SVG image using Apache Batik, as suggested here
http://docs.geotools.org/latest/userguide.old/library/render/gtrenderer.html#svg
and here
http://xmlgraphics.apache.org/batik/using/svg-generator.html
I set both the dependencies for gt-svg and the batik library.

Unfortunately, the renderer freezes when calling renderer.paint(svgGenerator, imageBounds, mapBounds); see code below.

When I step into the method, an exception is thrown at java.util.concurrent.FutureTask:innerRunandReset()
after labelCache.end(graphics, paintArea); is called at StreamingRenderer:854
and the thread freezes at java.util.concurrent.ThreadPoolExecutor:1130.

Does anyone know why this happens, and does anyone know a solution for this? (I'm using gt 9.4)
I really need this feature...

Cheers, Philipp

PS: Here's my code:

protected synchronized void saveSVG(String fileName) throws InterruptedException{
       writingSVG = true;
       System.out.println("Rendering image...");

       GTRenderer renderer = new StreamingRenderer();
        MapContent map = mapFrame.getMapContent();
        renderer.setMapContent(map);

        Rectangle imageBounds = null;
        ReferencedEnvelope mapBounds = null;
        try {
            mapBounds = mapFrame.getMapPane().getDisplayArea();
            double heightToWidth = mapBounds.getSpan(1) / mapBounds.getSpan(0);
            imageBounds = new Rectangle(
                    0, 0, width, (int) Math.round(width * heightToWidth));
        } catch (Exception e) {
            // failed to access map layers
             e.printStackTrace();
            throw new RuntimeException(e);
        }

        // Get a DOMImplementation.
        DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();

        // Create an instance of org.w3c.dom.Document.
        String svgNS = "http://www.w3.org/2000/svg";
        Document document = domImpl.createDocument(svgNS, "svg", null);

        // Create an instance of the SVG Generator.
        SVGGeneratorContext svggencon = SVGGeneratorContext.createDefault(document);
        SVGGraphics2D svgGenerator = new SVGGraphics2D(svggencon, true);
        svggencon.setComment("Generated by GeoTools2 with Batik SVG Generator");

        svgGenerator.setPaint(Color.WHITE);
        svgGenerator.fill(imageBounds);
        try {
            renderer.paint(svgGenerator, imageBounds, mapBounds);
             System.out.println("Writing " + fileName + "...");
            File fileToSave = new File(fileName);
            fileToSave.mkdirs();
            // Finally, stream out SVG to the standard output using
            // UTF-8 encoding.
            boolean useCSS = true; // we want to use CSS style attributes
            FileWriter out = new FileWriter(fileToSave);
            svgGenerator.stream(out, useCSS);

            System.out.println("...done!");
            writingSVG = false;
            notifyAll();

        } catch (IOException e) {
             e.printStackTrace();
            throw new RuntimeException(e);
        }
    }