Odd Batik Error : SVGOMDocument cannot be cast to SVGOMDocument

Hi All,

I have some very simple code, converting SVG to a PNG using batik.

This should be very simple to do, but for some reason there seems to be an
error casting an SVGOMDocument  to be SVGOMDocument  (itself !!!)

Any hints greatly appreciated !

Alan

Here is my SVG:
<svg height='600' width='800' version="1.1" xmlns="
http://www.w3.org/2000/svg"><desc></desc><defs></defs><a
title="StartSymbol0"><circle stroke-width="5" font-size="91px"
style="font-size: 91px; strok
e-width: 5;" stroke="#000000" fill="#00ff00" r="20" cy="35"
cx="35"/></a><circle stroke-width="4" font-size="93px" style="font-size:
93px; stroke-width: 4;" stroke="#000000" fill="#ff7f00" r="20" cy="
222" cx="261"/><circle stroke-width="3" font-size="94px" style="font-size:
94px; stroke-width: 3;" stroke="#000000" fill="#ff7f00" r="10" cy="222"
cx="261"/><path stroke-dasharray="15,5" stroke-width=
"5" style="stroke-width: 5;" d="M56,35C148,35,148,222,240,222"
stroke="#000000" fill="none"/></svg>

Here is my code:
ByteArrayInputStream bais = new ByteArrayInputStream(SVG.getBytes());
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
org.w3c.dom.Document doc = f.createDocument(null, bais);

TranscoderInput input = new TranscoderInput( doc );
OutputStream ostream = new FileOutputStream( name + ".png" );
TranscoderOutput output = new TranscoderOutput( ostream );

PNGTranscoder t = new PNGTranscoder();
t.transcode(input, output); //Line 211
ostream.flush();
ostream.close();

Here is the Exception I get:
java.lang.ClassCastException: org.apache.batik.dom.svg.SVGOMDocument cannot
be cast to org.apache.batik.dom.svg.SVGOMDocument
        at
org.apache.batik.bridge.BridgeContext.setDocument(BridgeContext.java:441)
        at org.apache.batik.bridge.GVTBuilder.build(GVTBuilder.java:54)
        at
org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:208)
        at
org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:92)
        at
org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:142)
        at
org.apache.batik.transcoder.SVGAbstractTranscoder.transcode(SVGAbstractTranscoder.java:156)
        at
DiagramPersistanceServlet.writeImage(DiagramPersistanceServlet.java:211)