I am attempting to read an XML file, use Xalan to convert it to
SVG, and then use Batik's transcoder to create a JPG file to send
to a user (all this from a servlet). I get a transcoder failure,
as shown below.
Here's the relevant part of the doPost() section of the servlet.
Any suggestions/cures would be greatly appreciated.
=================================
private Document svgDoc;
private String retrievedXML;
StylesheetRoot xslTemplate;
try
{
//for storing a compiled and resuseable style sheet
TransformerFactory factory = TransformerFactory.newInstance();
xslTemplate = factory.newTemplates("convert_to_svg.xsl");
}
catch (Exception ex)
{
ex.printStackTrace();
}
retrievedXML = getXML( request );
try
{
xmlString = new StreamSource(
new StringReader( retrievedXML )
);
Transformer transformer = xslTemplate.newTransformer();
transformer.setOutputProperty("encoding", "UTF-8");
DOMImplementation impl = SVGDOMImplementation.getDOMImplementation();
/* This is necessary; otherwise the transcoder gets
a different error (java.lang.ClassCastException:
org.apache.batik.dom.GenericElement
at org.apache.batik.dom.svg.SVGOMDocument.getRootElement
(SVGOMDocument.java:519) */
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
svgDoc = impl.createDocument( svgNS, "svg", null );
transformDOM = new DOMResult(
svgDoc.getDocumentElement() );
transformer.transform(
xmlString,
transformDOM
);
response.setContentType("image/jpeg");
response.setHeader("Cache-Control",
"no-cache, post-check=0, pre-check=0");
String agent = request.getHeader("User-Agent").toLowerCase();
// netscape chokes on Pragma no-cahe so only send it to explorer
if (agent.indexOf("explorer") > -1){
response.setHeader("Pragma", "no-cache");
}
response.setHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT");
JPEGTranscoder t = new JPEGTranscoder();
t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY,
new Float(.8));
// create the transcoder input
TranscoderInput input = new TranscoderInput( svgDoc );
try {
TranscoderOutput output =
new TranscoderOutput(response.getWriter());
t.transcode(input, output); /* error occurs here */
}
}
catch (Exception e)
{
e.printStackTrace();
}
========================================================
I get this error:
org.apache.batik.transcoder.TranscoderException: null
Enclosed Exception:
null
at
org.apache.batik.transcoder.image.ImageTranscoder.transcode(ImageTranscoder.java:262)
at
org.apache.batik.transcoder.XMLAbstractTranscoder.transcode(XMLAbstractTranscoder.java:126)
at Transform.doPost(Transform.java:145)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
at org.apache.tomcat.core.Handler.service(Handler.java:287)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Thread.java:484)
Debug output shows that neither input nor output is null;
Input doc is org.apache.batik.dom.svg.SVGOMDocument@502819
output is org.apache.batik.transcoder.TranscoderOutput@78aa80E
--
J. David Eisenberg
http://catcode.com
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
